The method of controlling the conditions of the steam curing of concrete and concrete products

 

(57) Abstract:

The invention relates to the treatment and management of conditions of moulded articles, in particular for the treatment and management of conditions of heat and humidity treatment of the moulded concrete and concrete products in the processing chamber. The purpose of the invention is to enhance reliability management conditions of heat and humidity treatment and quality of concrete and concrete products, as well as the reduction of energy consumption in the production of these products. This is achieved in that in the method of controlling the conditions of the steam curing of concrete and concrete products in the processing chamber, including a control pressure chamber, control the amount of moisture products by controlling the heating of the atmosphere chamber Autonomous sources of heat and control the amount of water in the atmosphere of the camera given the quality of the spray pattern by turning the water supply to the spray device, in this case, all the conditions of heat and humidity treatment is a series of sequentially executed one after the other periods: induction-keeping, purely thermal and heat-moisture treatment and the period of veterianary temperature and water pressure in the delivery pipe and the organization of overlap flame atomization of water obstacles, which large drops of flies, drain them and removed through the drain outlets obstacles. In addition, stabilize the pressure of the atmosphere by controlling the flow rate of air injected into the chamber. As with stabilization excess of atmospheric pressure chamber by controlling the flow rate of the air pumped into this chamber, and without such stabilizing control the magnitude of the electric potential from the control source of stabilized voltage, is applied to the metal parts of platform or forms, which are attached to the molded concrete products, or manage one or more managed sources stabilized voltage value of the electrical potential difference generated between the metal parts of the platform or boarding and special electrodes that are either a metal plate, or metal parts of the processing chamber, while the metal parts of the platforms or decks, and the metal plate special electrode that is electrically isolated from each other and from the "Cabinet" land of the processing chamber. 2 C.p. f-crystals, 9 Il.

The invention relates to the field of processing and optalloy processing of molded concrete and concrete products in the processing chamber.

A known method of controlling the conditions of heat-moisture treatment of the moulded concrete and concrete products in autoclaves (camera processing), which includes the management of excessive pressure by controlling the flow rate of the fluid supplied under pressure into the volume of the atmosphere of the autoclave in the form of high-temperature saturated steam or high-temperature steam-air mixture, while the excess pressure of the atmosphere in the autoclave is approximately 0.8 to 1.0 MPa (8 - 10 MPa) [1].

Processing of concrete and concrete products high-temperature saturated steam or high-temperature steam-air mixture and the management of conditions such heat and humidity treatment leads to the fact that in the treated concrete or reinforced concrete formed a significant maximum and residual deformation, significant shrinkage, and the presence of failures strength in the final stages of heat-moisture treatment, which affects the quality of concrete, or concrete after such heat and humidity treatment. These drawbacks are partially eliminated in a known manner, but this requires technical implementing complex, not always reliable techniques and those who humid processing, which reduces the reliability of this method. In addition to the disadvantages of this method include the presence of large energy costs associated with the production or high-temperature saturated steam or high-temperature steam-air mixture, served in the volume of the autoclave under pressure, creating in this volume excess pressure.

A known method of controlling the conditions of heat-moisture treatment of the moulded concrete and concrete products in the steam chambers (chambers of the processing), which includes the management of excessive pressure by controlling the flow rate of the coolant supplied to the volume of the atmosphere steaming chambers in the form of high-temperature saturated steam or high-temperature steam-air mixture, while the excess pressure of the atmosphere in the steam chamber is on the order of 0.005 to 0.05 MPa (0,05 - 0,5 MPa) [2]. The disadvantages of this method are the same shortcomings that exist in the above analogue.

The closest in technical essence is the process control method of heat-moisture treatment products in the chamber with a heat source by pre-curing, heat and aging, as well as the camera is dinasti control the conditions of heat-moisture treatment and quality of concrete and concrete products, as well as the reduction of energy consumption in the production of these products.

The task is solved in that in the method of controlling the conditions of the steam curing of concrete and concrete products in the chamber with a source of heat through their pre-induction withstand heat and aging, including the control pressure in the atmospheric chamber, control of the moisture content of the products produced by changing the heating chamber to heat and/or periodic spraying in the water chamber through the spray device, provided with a device for directions raspisivaem water and its removal through the drain taps, with the required amount of water to provide stabilization of the set values of temperature and water pressure in the feed line.

In this way you may control pressure in the chamber by changing the flow rate of the injected air. In addition it is possible to control the magnitude of the electric potential from the control source of stabilized voltage, is applied to the metal parts of the platforms or decks, which are and which are formed of concrete and reinforced concrete and electric potentials, created between the metal parts of the platforms or decks and special electrodes that are either a metal plate, or metal parts of the processing chamber, while the metal parts of the platforms or decks, and the metal plate special electrode that is electrically isolated between them from the Cabinet of land camera handling.

A comparison of the proposed technical solutions to the prototype allowed us to establish their compliance with the criterion of "novelty". The study of other known technical solutions in this field of technology features that distinguish the claimed invention from the prototype, were not identified, and therefore they provide the claimed technical solution according to the criterion of "significant differences".

In Fig. 1 - presents the structural layout of the functioning of the technical means implementing the method of Fig. 2 - metering characteristic of the spray device of Fig. 3 - metering characteristic separation of the water of the spray barrier to the spray device of Fig. 4 - graphs of the changes in the magnitude of the excess pressure of the atmosphere in the processing chamber from the time of heat-moisture treatment; Fig. 5 processing; in Fig. 6 - graphs of the changes in the intensity values increase dice the compressive strength from the time of heat-moisture treatment; Fig. 7 is graphs of the changes in the quantity of dice compression strength from the time of heat-moisture treatment; Fig. 8 - graphs of the change of the amount of moisture in the volume of concrete and concrete products from the time of heat-moisture treatment; Fig. 9 is graphs of the changes in the magnitude of the electric potential applied from one controlled voltage source to the metal parts of the platforms or decks, and the magnitude of the difference of electric potentials generated by the sources of stress between the metal parts of the platforms or decks and special electrodes that are either a metal plate or part of the cell that is electrically isolated from the metal parts of the platform or boarding, from the time of heat-moisture treatment.

The legend is given in Fig 1 to 9.

P is the water pressure in the delivery pipe of the spray device [MPa];

Q is the total discharge of water, flowing from the water supply through one spraying ostroy the separation of the flame atomization of the spray nozzle when naitanui large drops of water that torch on the barrier [l/h];

Q1the flow rate of water sprayed into the flame atomization after the release of this torch from the spray device and obstacles (l/h);

Phouses- excessive pressure of the atmosphere in the processing chamber [MPa];

T is the temperature of the atmosphere of the processing chamber (oC);

J is the intensity of the set of dice of compressive strength of concrete and reinforced concrete (MPa/h);

Rcubic SG.- dice the compressive strength of concrete and reinforced concrete (MPa);

W is the moisture content in concrete and concrete products (l/m3);

w - speed of moisture in the concrete products (l/(m3h));

the potential applied from the output of one of the control source of stabilized voltage to the metal parts of the platforms or decks (IN);

U is the electric potential difference that is generated from outputs of one or more managed stable sources of stress between the metal parts of the platforms or decks and special electrodes, which is a metal plate or the metal parts of the camera, which is electrically isolated from the metal parts of the platforms or decks (IN);

t is the time (duration) heat and humidity on t2- duration pauses curing of concrete products in the atmosphere of the processing chamber after you turn off the water supply to the spray device to the next power on (h).

The device comprises a chamber 1 of heat-moisture treatment in the internal volume of 2 which is movable metal platform 3 on which are and which are mounted molded concrete and concrete products 4. In addition, in the internal volume of 2 cameras 1 are placed thermocouple 5, the metal plate 6 of the special electrode attached to the ceiling of the chamber 1, an Autonomous heat sources 7, the spray device 8 barrier 9, with each barrier 9, of the spray device 8 has a drain outlet 10 to remove the water formed during the capture of this barrier 9 large drops of water from the volume of the flame atomization 11 generated at the output of each of the spray devices 8 with the corresponding barrier 9, and the sensor 12 gauge pressure and transfer the node 13, engaged in the supply air in the internal volume of 2 atmospheres camera 1 processing. Metal platform 3 and the metal plate 6 of the special electrode must be electrically isolated from each other, that is heat 7 of its common inlet connected through a regulatory body 14 and through the valve 15 with a direct line of heat supply 16, and the total output connected through a valve 17 with a return line steam supply 18, and thus controls the amount of steam in offline sources of heat 7 heat regulator 19, which regulates the temperature of the atmosphere in volume 2 of the camera 1, which is measured by a thermocouple 5 which communicate with the controller 19.

Either one spray device 8 barrier 9, or a group of the spray devices 8 with appropriate barriers 9 are connected via a shut-off valve 20, the regulator 21 and the valve 22 with the water supply line 23, while the amount of water in the internal volume of 2 atmospheres camera 1 is controlled by turning on and off supply of the supply voltage on the coil of the electromagnet 24 shutoff valve 20, and given the quality of the spray water in the atmosphere of the camera 1 provide the regulator 25 quality spray whose outputs are connected to respective control inputs of the heater 26 of the water and the regulatory body 21, and the inputs are connected to inputs of respective measuring the pressure sensor 27 and the temperature measuring respectively the pressure and temperature of the water supplied to the spray device 8.

Handout node 13, carrying out air flow in vnutri control values of excess pressure in the atmosphere of the camera 1 and the moisture content of concrete and concrete products by heat and heat and moisture treatment is carried out by alternating cycles turn on the water supply to the spray devices 8 and disabling this submission with subsequent heating of the atmosphere chamber 1 Autonomous heat sources 7 after such disconnection, and the stabilization of the value of the excess pressure of the atmosphere of the chamber 1 are provided by the corresponding control knob 32 of the air supply, its managing input connected to the output of the measuring sensor 12 gauge pressure.

The metal plate 6 of the special electrode are connected via terminal 33, through dip switch 34 and through the terminal 35 with the corresponding output of the control source 36 stabilized voltage, Cabinet which output terminal 37 is connected with an external Cabinet ground. Metal platform 3 is connected to terminal 38 and to the input of the rolling plunger 39 of the three-position switch 40. Position 1 of switch 40 is connected to terminal 41, the position 2 of switch 40 is connected via terminals 42 and 43 with the corresponding output of the control source 44 stabilized voltage, Cabinet whose input is connected via terminal 45 with an external pressurized ground, with which the terminals 45 and 46 is a link to the relevant position 3-position switch 40.

The control inputs of the respective regulators 19, 25, 32, the electromagnet 24 shut-off valve 20 and the springs 36 and 44 strawley 47, which is controlled by the computer 48.

In the inventive methods of control all the conditions of the steam curing of concrete and concrete products is a series of sequentially executed one after the other periods: the period of induction-keeping products, periods purely thermal and heat-moisture treatment and the period of aging products in the internal volume of 2 cameras 1 processing.

In order to carry out the claimed methods of control conditions moist curing of concrete and concrete products, it is necessary to experimentally obtain graphs of total consumption characteristics and graphs of the metering characteristics of the water separation torch atomization for each of the spray devices 8 with the obstacle 9. These charts total expenditure characteristics and expenditure of the water separation characteristics of the flame atomization is the corresponding dependency graphs 49 and 50; 51 and 52; 53, 54; 55, 56; 57, 58; 59 and 60; experimentally obtained for the conditions when the temperature of the water before the spray device 8 is equal to the corresponding values of the 20oC, 30oC, 40oC, 60oC, 80oC, 90oC.

When this schedules dependent is an ode to water, passed through this spray device 8 (this is a common metering characteristics of the spray device 8 with the obstacle 9), and the graphs of dependencies 50, 52, 54, 56, 58, 60 show the dependence of the flow rate of water flowing through the spray device 8, the magnitude of the amount of water picked up by the obstacle 9 in the form of large drops of the volume of the spray torch 11 generated by the spray device 8 with the obstacle 9 (this flow characteristic separation of water from the torch atomization).

The choice of the working point of functioning of each of the spray devices 8 barrier 9 on expandable characteristics (Fig. 2 and 3) for all the declared methods of the invention is determined taking into account the experimental set optimum ratio between the amount of power consumption and speed dialing moisture (w) molded concrete blocks without formwork for the first four hours of heat-moisture treatment after appropriate induction periods extracts and pure thermal treatment of concrete. The amount of energy in this choice should include the energy costs associated with heating water feed line, with on and off her feed to the spray device the bath under thermal and heat and moisture treatment of water and heat, thus the value of the energy is taken in both physical and value terms.

To simplify the choice of the working point of functioning of each of the spray devices 8 barrier 9 ensure that all the declared methods of the invention, the feasibility of the fact that the period of induction curing of concrete and concrete products is equal to the period of purely thermal treatment of products in the processing chamber 1 and is 2 hours. The period of purely thermal treatment is always necessary only after a period of induction-keeping, with the first hour of heat treatment is provided by the rise of temperature of the atmosphere in the chamber 1 by heating auxiliary heat source 7 to the given value, and the second hour heat treatment is provided to maintain the temperature at a given level.

The feasibility of the required assumptions are not strictly necessary and is used in the description of the invention only to simplify and facilitate the understanding of the illustrative material description of these methods.

Example 1 of the method.

For the implementation of the proposed method it is necessary to bring to its original state following elements of the device, presents the indoor volume 2 of the atmosphere of the chamber 1, the air is not supplied, and all regulators 14, 19, 21, 29 and the solenoid valve 20 in the initial state are closed; the valve 15 in a straight line 16 steam, valve 17 on the back line 18 steam and valve 22 to the supply line 23 water are in the open position, in addition, two-position circuit breaker 34 is in the open position, and a movable plunger 39 of the three-position switch 40 is moved to position 1.

Selection modes of the auxiliary heat source 7 and the spray devices 8 graphics 9 is the selection of the operation modes, respectively regulator 14 with the regulator 19 to the supply line 16 heat to the heat source 7, the regulatory body 21 with the regulator 25 and shut-off valve 20 with the electromagnet 24 to the supply line 23 of water to the spray devices 8 when the control computer 48, which provides these preset modes of operation according to the following algorithm performed sequentially technological operations.

1. Based on the requirements finely pulverized water in volume 2 of the atmosphere of the chamber 1 processing is set by experimentally obtained graphs adequate supplies of characteristics (Fig. 2 and 3) the values of Q, P, Q*and Q1in you is counteracted device 8 with the barriers 9 and the duration of pauses t2keeping concrete products after you turn off the water supply until the next power-on.

3. In the same transmitter 48 are laws control heating Autonomous heat sources 7, this should be a mandatory requirement that the heating of the atmosphere of the chamber 1 auxiliary heat source 7 is carried out only after turning off the water supply to the spray device 8.

4. Next is preparing the concrete mix specified brand of the concrete from which the metal molds are formed of concrete cubes of size 0.1 X 0.1 X 0.1 m3the specified number.

5. Molded concrete cubes stand in these metal forms along with forms throughout the duration of the induction period outside of the camera 1 processing, and the like to a bear, and after he measured the weight of each concrete cube.

6. Then after induction keeping the formwork with concrete blocks is removed and the cubes are placed evenly on the platform 3 in the chamber 1 processing.

7. Over laid evenly in the chamber 1 treatment of concrete cubes in the first two hours of their stay in the camera operate in a purely thermal processing with Pokie in the concrete. In addition, for a purely thermal treatment of concrete cubes in the first hour of thermal treatment is heating chamber 1 to a predetermined temperature, and the second hour of this heat treatment, the temperature is maintained at a specified level.

8. Further, subject to mandatory implementation of all the above-mentioned sequence of processes for four hours conduct heat and humidity treatment in the atmosphere of the chamber 1 treatment, after which each of the above blocks is measured by weight and is calculated speed set moisture w in concrete cubes, which is defined as the difference between the values of the weights for each concrete cube after heat-moisture treatment and after a purely thermal treatment of the cube in the processing chamber 1.

9. Obtained values of the speeds set moisture w for all concrete cubes average.

The above process parameters optimization of the values of Q, P, Q*, Q1, t1, t2, laws, management, quantity and cost of inputs, which includes the cost of materials and energy in the production of heat-moisture treatment (cost of steam, water, electricity and so on) can be done up until moisture w in concrete cubes.

Determine the modes of operation of the elements of the device shown in Fig. 1, and with modes of heat and moisture curing defined with the necessary amount of concrete cubes that are formed from the same brand of concrete in order to obtain a sufficient degree of accuracy required of the experimental dependence, which will be further used to control the conditions of the steam curing of concrete and concrete products in the processing chamber 1.

With molded concrete cubes of the same brand of concrete specified number to obtain the necessary experimental dependencies are also modes of induction curing of concrete cubes out of the camera, purely thermal and moisture curing these cubes in the processing chamber 1 as in the above procedure optimization, but in contrast, the period of heat-moisture treatment is a long and additionally after a period of moist curing regime exists-keeping in the internal volume of the chamber 1 processing.

During induction keeping out of the chamber 1, while a purely thermal and moisture curing, as well as vyderzhannogo cube of a given brand of concrete was carried out measuring values the following values of PhousesT and were constructed corresponding dependence of the measurement of the excess pressure Phouses(graph 60, Fig. 4) and temperature T (graph 61, Fig. 5) from the amount of time during which was managed by the conditions of the steam curing of concrete cubes.

The magnitude of time during which was managed by the conditions of the steam curing of concrete cubes, receive the experimental dependence of the magnitude change of the intensity of the set of dice compression strength J (graph 62, Fig. 6), the set of dice compressive strength of Rcubic SG.(graph 63, Fig. 7) and the moisture content in the concrete (figure 64, Fig. 8) by testing the compressive strength of one or more cubes after the expiration of each hour, pre-measuring the weight of each cube, which calculates the moisture content in the concrete.

When receiving the above experimental dependencies are managed and/or maintained at a given level calculator 48 laws of change of the temperature in the chamber 1, the pressure and temperature of the water in the feed line and the intervals t1and t2.

Experimental graphics dependence is ineichen are used to control the conditions of heat-moisture treatment of various concrete products of this brand of concrete in an atmosphere of camera 1 processing.

The feature of the processing of concrete and concrete products from the same specified brands of concrete using the obtained experimental dependences 60 - 64 and laws governing the conditions of such processing is the following:

allows use control laws;

performed periodic measurement and monitoring of conformity measured values of Phousesand T the corresponding values of the dependency graph 60, 61;

monitor the completion of the processing in two or three concrete cubes that are placed in the chamber 1 together with concrete of the same specified brand of the concrete against the target values of the graphs 62 - 64.

Example 2.

For the implementation of the proposed method it is necessary to bring the elements of the device shown in Fig. 1 in the same initial conditions as in example 1 of the method, in addition to the requirements of the original condition of the valve 30, which should be in the open position, and a regulatory body 29 in the initial state sacralisation node 13 is the selection of the operation modes, respectively regulator 14 with the regulator 19 to the supply line 16 heat to the heat source 7, the regulatory body 21 with the regulator 25 and shut-off valve 20 with the electromagnet 24 and the water supply line to the spray devices 8 barrier 9, as well as the regulatory body 29 with the regulator 32 in the supply line 31 of the air to the distributing node 13 when the control computer 48, which provides these preset modes for the optimization procedure of the values of the quantities Q, P, Q*, Q1, t1, t2, laws governing these quantities and value of inputs as in example 1 of the method.

Determine the modes of heat and moisture curing as in example 1, the method is defined with the required amount of concrete cubes that are formed from the same brand of concrete, in order to obtain a sufficient degree of accuracy required of the experimental dependence, which will be further used to control the conditions of the steam curing of concrete and concrete products in the processing chamber 1.

Also as in example 1, the method to measure the values of Phouses, T, J, Rcubic SG, W, and build the corresponding dependences of the magnitude change of the excess pressure Phouses(graph 65, Fig. 4), uzbekovoy the compressive strength Rcubic SG(graph 67, Fig. 7), the moisture content in concrete W (graph 68, Fig. 8).

When receiving the above dependencies are managed and/or maintained at a given level calculator 48 laws of change of temperature in the atmosphere of the chamber 1, the temperature and pressure in a feed line, and the value of the interval t1, t2.

Experimental graphs of dependencies 61, 65 - 68, and is also used to obtain control laws stored in the transmitter 48 and further applied in order to control the conditions of heat-moisture treatment of various concrete and reinforced concrete products of this brand of concrete in an atmosphere of camera 1 processing. It uses the same features of the processing of concrete and concrete products, as in the example 1 of the method, and when such processing is carried out periodic measurement and verification of conformity of the measured values of Phouses, T the corresponding values of the dependency graph 65, 66, and the control at the end of processing in two or three concrete cubes that are placed in the chamber 1 together with concrete and reinforced concrete products of a given brand of concrete, according Koba need to cast the elements of the device, presented on Fig. 1 in the same initial conditions as in example 1 of the method, in addition to the requirements for the position of the movable plunger 39 of the three-position switch 40, which is translated in position 2, providing a metal platform 3 of a given electric potential from the control source of stabilized voltage 44.

Selection modes of the auxiliary heat source 7, the spray devices 8 graphics 9, the control source of stabilized voltage 44 is the selection of the operation modes, respectively regulator 14 with the regulator 19 to the supply line 16 heat to the heat source 7, the regulatory body 21 with the regulator 25 and shut-off valve 20 with the electromagnet 24 to the supply line 23 of water to the spray devices 8 graphics 9 when the control computer 48, which provides preset modes in the optimization procedure of the values of the quantities Q, P, Q*, Q1, t1, t2laws controlling these quantities and cost of energy consumption is carried out as in example 1 of the method. In addition, in this optimization procedure, additionally, the transmitter 48 is controlled essentializing voltage 44.

Also as in example 1, the method to determine the modes of heat and heat-moisture treatment and the number of concrete cubes of this brand of concrete, measured values of Phousesb T, J, Rcubic SG, W, build the corresponding dependences of the magnitude change of the excess pressure Phouses(graph 60 of Fig. 4), temperature T (graph 61 Fig. 5), the intensity of the set of dice compression strength J (graph 69 Fig. 6), the set of dice compressive strength of Rcubic SG(graph 70 of Fig. 7), the moisture content in the concrete cubes W (schedule 71, Fig. 8), the change in the electrical potential (graph 72 of Fig. 9).

Experimental graphs of dependencies 60, 61, 69 - 72, and is also used to obtain control laws stored in the transmitter 48 and further applied in order to control the conditions of heat and moisture curing various concrete and reinforced concrete products of this brand of concrete in an atmosphere of camera 1. It uses the same features of the processing of concrete and concrete products, as in the example 1 of the method, and when such processing is carried out periodic measurement and monitoring of conformity measured values P

Example 4.

For the implementation of the proposed method it is necessary to bring the elements of the device shown in Fig. 1 in the same initial conditions as in example 2 of the method, in addition to the requirements for the position of the movable plunger 39 of the three-position switch 40. While the movable plunger 39 of the circuit breaker 40 is translated in position 2, providing a metal platform 3 of a given electric potential from the control source of stabilized voltage 44.

Selection modes of the auxiliary heat source 7, the spray devices 8 graphics 9 and distributing node 13 is also carried out as in example 2 of the method. In addition, this optimization procedure is performed with the computer 48 controls the magnitude of the corresponding source of stabilized voltage 44, the output electric potential of which is connected respectively with metal plates 6 special electrode.

Also as in example 2 carried out the b, T, J, Rcubic SGW and additionally value and build the corresponding dependences of the magnitude change of the excess pressure Phouses(graph 65, Fig. 4), temperature T (graph 61, Fig. 5), the intensity of the set of dice compression strength J (graph 73 Fig. 6), the set of dice compressive strength of Rcubic SG(graph 74 of Fig. 7), the moisture content in concrete W (graph 75, Fig. 8) and electric potential (graph 72 of Fig. 9).

Experimental graphs of 65, 61, 73, 74, 75, 72, and also used to produce the control laws stored in the transmitter 48 and further applied in order to control the conditions of heat and steam curing of concrete and concrete products of a given brand of concrete in an atmosphere of camera 1 processing.

It uses the same features of the processing of concrete and reinforced concrete of specified grade concrete, as in the example 2 of the method, and when such processing is carried out periodic measurement and monitoring of conformity measured values of Phouses, T the corresponding values of the dependency graph 65, 61 and 72, and the control at the end of processing in two or three concrete cubicity the final values of the graphs 73, 74, 75.

Example 5.

For the implementation of the proposed method it is necessary to bring the elements of the device represented in Fig. 1 in the same initial conditions as in example 1 of the method, in addition to the requirements for the position of the movable plunger 39 of the three-position switch 40 to the position dip switch 34. While the movable plunger 39 of the three-position switch 40 is switched to position 2, providing a metal platform 3 of a given electric potential from the control source of stabilized voltage 44 and dip breaker 34 is in the closed position, providing a metal plate 6 special electrode of a given electric potential from the control source of stabilized voltage 36.

Selection modes of the auxiliary heat source 7, the spray devices 8 graphics 9 is the same as in example 1 of the method. In addition, this optimization procedure add execute computer 48 controls the magnitude of the electric potential difference U corresponding control inputs managed estonienne the metal plates 6 special electrode 4 to the metal parts of the platforms or decks.

Also as in example 1, the method to determine the modes of heat and heat-moisture treatment and the number of concrete cubes of this brand of concrete, measured values of Phouses, T, J, Rcubic SG, W, and optionally, the value of U and construct the corresponding dependences of the magnitude change of the excess pressure Phouses(graph 60, Fig. 4), temperature T (graph 61, Fig. 5), the intensity of the set of dice compression strength J (graph 76, Fig. 6), the set of dice compressive strength of Rcubic SG(graph 77, Fig. 7), the moisture content in concrete W (graph 78, Fig. 8), and the potential difference U (graph 79, Fig. 9).

Experimental graphs of 60, 61, 76 - 79, and is also used to obtain control laws stored in the transmitter 48 and further applied in order to control the conditions of heat and steam curing of concrete and concrete products of a given brand of concrete in an atmosphere of camera 1 processing.

It uses the same features of the processing of concrete and reinforced concrete of specified grade concrete, as in the example 1 of the method, and when such processing is carried out periodic measurement is of zavisimosti 60, 61 and 79, as well as control when processing is completed in two or three concrete cubes that are placed in the chamber 1 together with concrete and reinforced concrete products given the same brand of concrete, according to the final values of the graphs 76, 77, 78.

Example 6.

For the implementation of the proposed method it is necessary to bring the elements of the device shown in Fig. 1, in the same initial conditions as in example 2 of the method, in addition to the requirements for the position of the movable plunger 39 of the three-position switch 40 to the position dip switch 34, which occupy the same initial condition as in example 5, the implementation of the method.

Selection modes of the auxiliary heat source 7, the spray devices 8 graphics 9 and distributing node 13 is the same as in example 2 of the method, in addition to the requirements to the rolling position of the plunger 39 of the three-position switch 40 to the position dip switch 39, which corresponds to example 5 of the method.

Also as in example 5, the method, carry out the measurement values of Phouses, T, J, Rcubic SG, W and U, and build the corresponding dependences of the change is boron dice compression strength J (schedule 80, Fig. 6), the set of dice compressive strength of Rcubic SG(graph 81, Fig. 7), the moisture content in concrete W (graph 82, Fig. 8), and the electric potential difference U (graph 79, Fig. 9).

Experimental graphs of 65, 61, 80, 81, 82, 79, and also used to produce the control laws stored in the transmitter 48 and further applied in order to control the conditions of heat and steam curing of concrete and concrete products of a given brand of concrete in an atmosphere of camera 1 processing.

In the processing of concrete and concrete products given the same grades of concrete are implemented the same features processing as in example 2 of the method, when such processing is carried out periodic measurement and monitoring of conformity measured values of Phouses, T and U the corresponding values of the dependency graph 65, 61 and 79, as well as control when processing is completed in two or three concrete cubes that are placed in the chamber 1 together with concrete and reinforced concrete products given the same brand of concrete, according to the final values of the graphs 80, 81, 82.

Examples of implementation methods.

General Tr heat and steam curing chamber furnace is used, having an inner volume of 2 length 2.0 m, width of 2.0 m and a height of 0.8 seconds, while the inner surface is lined with red brick of baked clay.

For used in making cement grade 400 suholozhskogo cement plant in the Sverdlovsk region, as fillers are used gravel particle size 10,0 - 50,0 mm Sarassoro career Sverdlovsk region and sand from Magniscope career Sverdlovsk region, as the mixing water is used for drinking water requirements which meet the state Standards on consumption as drinking water in the city of Yekaterinburg, Sverdlovsk oblast.

For all cases, the description of the invention uses a heavy concrete having the following composition:

1) ratio = cement : gravel : sand respectively equal to 1 : 1,87 : 2,78;

2) water / cement ratio is respectively In/C + of 0.45, which corresponds to 174 l of water mixing concrete (174 l/m3).

As the metal platform 3 used a metal cart, which had the opportunity to travel on the rails inside the chamber 1 processing, and the total surface area of this truck, which is formed of concrete and concrete products, costall the location area have metal plates 6 special electrode, fixed in the upper part of the chamber 1 processing.

As a metal platform 3 and the metal plate 6 special electrode in the processing chamber 1 are electrically isolated from each other and from the Cabinet of the earth workshop, in which the camera 1.

Concrete blocks and concrete products used in the examples of concrete implementations of the methods had the following dimensions: 1) dice: 0,1 0,1 0,1 m3; 2) concrete blocks 0,4 0,4 1,9 m3and on a metal platform 3 Packed evenly across the width of the camera 1 three concrete block 4, the distance between the blocks and between the end blocks and the walls of the chamber 1 was 0.2 m, and between the ends of the blocks and the walls of the chamber 1 was 0.05 m

In the internal volume of 2 cameras 1 processing functioned always one spray device 8 with the corresponding barrier 9, in which the volume of the chamber can be many.

Thus, the operation of the regulatory body 21 with the regulator 25 and shut-off valve 20 with the electromagnet 24, and an adjustable heater 26 water temperature in the feed line 23 water spray device 8 must provide the following values of temperature and water pressure the filing of the water and breaks shall be the corresponding values of t1= 3 min; t2= 10 minutes

Common to all examples of a particular implementation was that the whole management strategy conditions of heat and humidity treatment was represented by the number of sequentially executed one after the other periods: the period of induction curing of concrete and concrete products, periods purely thermal and heat-moisture treatment and the period of aging products in the internal volume of 2 cameras 1.

Duration of the periods of induction and keeping pure heat treatment are the same, and during the first hour of heat treatment is heated atmosphere of the chamber 1 to a temperature of T = 50oC, and during the second hour heat treatment was carried out isothermal ageing products in the atmosphere of the chamber 1, in which by means of Autonomous sources of heat maintained a constant value of temperature T = 50oC/

The duration of moist curing products in the internal volume of 2 camera 1 was 8 h, and the length keeping these products after heat-moisture treatment in volume 2 of the camera 1 was 1 o'clock

The heating temperature of the atmosphere in the chamber 1 Autonomous sources 7 tepeli in the internal volume of 2 cameras 1 and disable Autonomous sources of heat 7 was carried out immediately after the temperature of the atmosphere of the chamber 1 the average of its values 40oC. During this interval of temperature change in the atmosphere of the chamber 1 was changed with respect to its average value in the range from 35 to 45oC.

An important requirement for all examples of a particular implementation of the method is providing more than 70% achievement of concrete and reinforced concrete products to their specified grade strength M300 after completion of all requirements, technology management conditions of heat and humidity treatment of these products.

Example 1 a specific implementation of the method. In this example, all the control conditions of heat and humidity treatment corresponds to example 1 of the method.

When building the experimental dependences 62 - 64 thermal and heat-moisture treatment on the conditions of example 1 of the method were subjected to 26 concrete cubes, evenly placed on the platform 3 and compression testing was carried out with two dice after the expiration of each hour of processing, the measured values of J, Rcubic SGand W were averaged, and these values were built according to 62 - 64. When this excess pressure in volume 2 of the camera 1 was changed with respect to its average value is 0.017 MPa within 0,0109 to 0,0192 MPa.

Border 70% snacky in the processing chamber 1.

Example 2. In this example, all the control conditions of heat and humidity treatment corresponds to example 2 of the method.

When building the experimental curves 66 and 68 of heat and heat-moisture treatment on the conditions of example 2 of the method were subjected to 26 concrete cubes, evenly placed on the platform 3 and compression testing was carried out with two dice after the expiration of each hour of processing, the measured values of J, RA cube.SGand W were averaged, and these values were built according to the 66 - 68. When this excess pressure in volume 2 of the camera 1 was changed with respect to its average value is 0.023 MPa within 0,0217 to 0,0243 MPa.

Border 70% of the nominal strength of concrete and concrete products was achieved for 5.5 h of heat-moisture treatment in the processing chamber 1.

Example 3. In this example, all the control conditions of heat and humidity treatment corresponds to example 3 of the method.

When building the experimental dependences 69 - 71 heat and heat-moisture treatment on the conditions of example 3 of the method were subjected to 26 concrete cubes, evenly placed on the platform 3 and test the masks and J, Rcubic SGand W were averaged, and these values were built according to 69 - 71. When this excess pressure in volume 2 of the camera 1 was changed with respect to its average value is 0.017 MPa within 0,0109 to 0,0192 MPa. The value of the electric potential applied to the metal platform 3 from the control source of stabilized voltage 44 was changed stepwise, and the first two hours of heat-moisture treatment capacity took a value of 20 In, in the next two hours and 40 In, even in the next two hours, 42, and in the last two and a half hours had potential voltage 47, disabling the source 44 and the shutoff of the electrical potential was carried out between keeping after a period of moist curing for 30 minutes before the end of this period bear.

Border 70% of the nominal strength of concrete and concrete products was achieved within 5 h of heat-moisture treatment in the processing chamber 1.

Example 4 In this example, all the control conditions of heat and humidity treatment corresponds to example 4 of the method.

When building the experimental dependences 73 - 75 heat and heat-moisture treatment on the conditions of example 4 done what was done with two dice after the expiration of each hour of processing, the measured values of J, Rcubic SGand W were averaged, and these values were built according to 73 - 75. When this excess pressure in volume 2 of the camera 1 was changed with respect to its average value is 0.023 MPa within 0,0217 to 0,0243 MPa (carried out to stabilize the magnitude of the excess pressure by an additional injection of air into the chamber 1). The value of the electric potential applied to the metal platform 3 from the control source stabilizirovannogo voltage 44 was changed as in example 3, a particular implementation of the method.

Border 70% of the nominal strength of concrete and concrete products was achieved within 4.5 h of heat-moisture treatment in the processing chamber 1.

Example 5 In example 5, all of the conditions of heat and humidity treatment corresponds to example 5 of the method.

When building the experimental dependences 76 - 78 heat and heat-moisture treatment on the conditions of example 5, the method has been 26 concrete cubes, evenly placed on the platform 3 and compression testing was carried out with two dice after the expiration of each hour of processing, the measured values of J, Rthe IU 2 camera 1 was changed with respect to its average value is 0.017 MPa within 0,0109 to 0,0192 MPa. The value of the electric potential difference created between the metal platform 3 and the metal plate 6 of the special electrode from the corresponding managed sources stabilized voltage 36 and 44 was changed stepwise, and the first two hours of moist curing potential difference took a value of 17 In, in the next two hours - 35, and in the penultimate two hours - 42, and in the last 2,2 h electric potential difference U had a value of 40 In, disabling sources 36 and 44 and the supply of appropriate potentials to create the electrical potential difference U between the metal platform 3 and the metal plate 6 of the special electrode during artificial aging after a period of moist curing for 50 min before the end of this period bear.

Border 70% of the nominal strength of concrete and concrete products was achieved during 4,2 h heat and humidity of the processing in the processing chamber 1.

Example 6. In this example, all the control conditions of heat and humidity treatment corresponds to example 6 of the method.

When building the experimental curves 80 and 82 of heat and the heat and humidity obrabotvane 3 and compression testing was carried out with two dice after the expiration of each hour of processing, the measured values of J, Rcubic SGand W were averaged, and these values were built according to 80 - 82. When this excess pressure in volume 2 of the camera 1 was changed with respect to its average value is 0.023 MPa within 0,0217 to 0,0243 MPa. The value of the electric potential difference created between the metal platform 3 and the metal plate 6 of the special electrode from the corresponding managed stabilized voltage sources 36 and 44 were changed as in example 5, the specific implementation of the method.

Border 70% of the nominal strength of concrete and concrete products was achieved during 3,7 h heat and humidity of the processing in the processing chamber 1.

Use the ways to control the conditions of heat-moisture treatment will significantly improve the reliability of heat-moisture treatment, reduce energy consumption and the total duration of such heat and humidity treatment.

Under this treatment as a result of accelerated curing of concrete eliminates the formation of cracks, which in General will increase the quality of concrete and concrete products. In addition, there is a high probability of replacement of cement higher brand (thin omologazione advantages ways to control the conditions of heat-moisture treatment will significantly reduce the cost of the total production of concrete and concrete products.

1. The method of controlling the conditions of the steam curing of concrete and concrete products in the chamber with a source of heat through their pre-induction curing, heat and aging, including the control pressure in the atmospheric chamber, characterized in that the control of the moisture content of the products produced by changing the heating chamber to heat and/or periodic spraying in the water chamber through the spray device, provided with a device for directions raspisivaem water and its removal through the drain taps, with the required amount of water to provide stabilization of the set values of temperature and water pressure in the feed line.

2. The method according to p. 1, characterized in that the control pressure in the chamber is carried out by changing the flow rate of the injected air.

3. The method according to PP.1 and 2, characterized in that the control value of the electric potential from the control source of stabilized voltage, is applied to the metal parts of the platforms or decks, which are and which are formed of concrete and concrete products, or managing one or not is th between the metal parts of the platforms or decks and special electrodes, representing either a metal plate or the metal parts of the processing chamber, while the metal parts of the platforms or decks, and the metal plate special electrode that is electrically isolated from each other and from corps land camera processing.

 

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