Concrete strength monitoring device

FIELD: process engineering.

SUBSTANCE: invention relates to construction, namely, to method of controlling concrete thermal treatment. Proposed device comprises heater to heat laid concrete mix by heating wire or electrodes, measure mix temperature by temperature pickups, and system for automatic control over concrete article heating. Said system is composed of nondestructive control electronic transducers and instruments, i.e. USB-1, Pulsar-2 to take readings directly from early concrete, heating transformer KTP, double-ended lamps, multichannel temperature, heating and data reading interval meter, bus line, feed and heating devices, registrator and computer.

EFFECT: higher accuracy of control, stabilised temperature difference and concrete article and ambient medium.

 

The invention relates to the construction industry, in particular to devices process control heat treatment in the monolithic house-building and the automatic warm-up concrete "Ether". In the construction in the manufacture of concrete products known device for heat treatment, providing faster growing strength products [Mironov S.A. Theory and methods winter concreting. Ed. 3rd, Rev. and more. M.: stroiizdat, 1975 - 700 C.]. Moreover, the flow of coolant is adjusted and limited to the maximum surface temperature products. However, it is impossible to provide a set of concrete specified strength for the shortest period of time with minimum energy consumption. In addition, the disadvantages of the device are low productivity, large volume, low quality, lack of comfortable working conditions of staff. The closest in technical essence and the achieved effect to the proposed device is a device for regulating the temperature and humidity in the processing of concrete products plants periodic action (USSR author's certificate No. 1529180, CL G05D 27/00, 1987), including the heater products, command block, temperature controller, temperature sensors.

And the known device is focused on factory production technology products in stationary climatic conditions and does not fully meet the requirements of heat treatment of products in an open construction site in conditions of sharply varying external factors such as outside air temperature and wind speed that occurs in the monolithic house-building. Excluding the listed external factors it is impossible to determine the optimal time of isothermal heating the concrete and to predict the time of cooling of the concrete, which will not allow a timely manner to stop the flow of coolant and will lead to energy wastage. In addition, without taking into account the outdoor temperature and wind speed, it is impossible to properly control the speed of temperature rise of the concrete mix (from 5C to 20C per hour depending on the module surface structure) and the cooling rate of concrete (15C per hour), which can lead to lower quality of construction products. The aim of the invention is the provision of optimal conditions of hardening concrete structures. This objective is achieved in that the automatic control of heat treatment of concrete in thermosetting formwork containing heaters installed concrete mixture, the temperature sensors of the mixture, temperature controller, which limits the temperature of the surface layer of concrete by changing the coolant in the heat treatment process, is further provided with sensors outdoor air temperature and wind speed, temperature sensors concrete in contact the one with the heaters, sensor strength of concrete and the second temperature controller, and the first controller controls the temperature of the outer shield and the second internal shield.

Comparative analysis of the proposed solutions with the prototype shows that the inventive device is characterized by the presence of new units, namely equipped with sensors outdoor air temperature and wind speed, temperature sensors concrete in the contact area with heaters, a sensor strength of concrete.

Thus, the proposed device meets the criteria of "novelty" and "inventive step".

Figure 1 shows the connection diagram of the heating up of the monolithic substrate. Figure 2 - electrical functional diagram of the automated heating the concrete. Figure 3 presents a graph of curing depending on the temperature. Figure 4 presents a graph of curing depending on the temperature. Figure 5 shows a graph of the output on the warm-up mode depending on the temperature using the methods of automated heating the concrete, figure 6 shows the graph of the set of concrete strength at an ambient temperature of 15 degrees Celsius. Figure 7 shows the table of savings from the implementation of online monitoring of the curing of concrete at an early age with avtomatizirovannyi control heating of the concrete.

Device operational control of concrete strength at an early age by controlling heat treatment of concrete in thermosetting forms (figure 1) contains meter-recorder 1, which implemented the command block 1, the computing device 1, a temperature controller (not shown) of the outer shield thermoplasty (not shown), a temperature controller (not shown) of the internal shield thermoplasty (not shown), the wind speed sensor (not shown), a temperature sensor, outdoor air (not shown), the sensor temperature of the concrete in the contact zone (not shown) with an outer shield of thermoplasti (not shown), the temperature sensor of the concrete in the contact zone (not shown) with an internal shield thermoplasty (not shown), a sensor (not shown) the temperature of the concrete in the body design, the sensor strength of concrete (not shown). Operational control system the strength of concrete at an early age and the ACS device in its implementation (figure 1) consists of a programmable logic controller (meter-controller TRM 1 And consisting of a Central processor unit 1, a power supply transformer (not shown), temperature sensors (thermocouples) (not shown), the heating wires (not shown); a block of discrete outputs (not shown), data bus and control (not shown), of block real time clock (not pok is the timeframe), memory block 1, block log quick counters and interrupts (not shown) and block serial interface. Sensors wind speed (not shown) and outside air temperature (not shown) connected to the first and the second input of the command block, respectively. The temperature sensors of the concrete in the body structure (not shown), the temperature of the concrete in the contact zone with an outer shield thermosetting moulding (not shown), the inner shield (not shown) connected to the third, fourth and fifth input of the command block, respectively. The temperature sensor of concrete (not shown) connected to the sixth input of the command block. Computing device 1 is connected to the third output of the command block (not shown). The temperature controller of the external shield thermoplasty (not shown) connected to the first output of the command block (not shown). The temperature controller internal shield thermoplasty connected to the second output of the command block. Command block 1 is connected to the first output of the computing device 1. The device operates as follows (figure 1). After switching on the control unit 1 generates a command to activate the sensors outdoor air temperature and wind speed, temperature sensors in concrete contact area with heaters (not shown) and a temperature sensor of the concrete in the body structure (not shown). To andny unit makes a request of the initial parameters of the technological process of concreting (kind of concrete structures structural features of thermoplasti, kind of laid concrete mix, the module surface structure). In the absence of input parameters such request is repeated. After you enter the initial settings of the computing device 1, in accordance with the data arriving at the inputs of the command block from sensors outdoor air temperature, wind speed and temperature sensor of the concrete in the body structure (not shown), determines the temperature of the heat treatment. Computing device 1 transmits the information to the seventh input of the command block. Command block 1 sends a signal to the temperature controllers (not shown). Shields thermosetting moulding (not shown) and begin the process of thermal treatment of concrete structures. Temperature controllers (not shown) support and limit specified computing device (not shown) temperature values. During heat treatment the wind speed sensor, temperature sensor outside air temperature sensor, concrete, 5 in the body design, the temperature sensors of the concrete in the contact zone with thermosetting formwork (not shown) continuously serves information on the inputs of the command block. The sudden change in external factors or emergency computing device 1 adjusts the treatment mode or stops it. After time armoor is the command processing unit 1 sends a signal to the temperature controllers (not shown) on the termination of the coolant. Sensor strength (not shown) determines the dialed concrete strength, if not obtained values specified heat treatment process of the concrete continues.

The use of the proposed device for automated heating the concrete provides in comparison with existing devices the following benefits :

The method of automated control of the curing process of concrete, including heating laid mixture by heating using a heating wire or electrodes, measuring the temperature of the mixture, the temperature control of the mixture by changing the electrical characteristics, limiting the temperature of its surface layer by changing the characteristics of the electric current in the process of heat treatment, the temperature measurement and the current strength of the product, the definition of the beginning of the rise of temperature to achieve a product at the stage of preliminary exposure given initial strength and determination of the moment of lowering the temperature of the product, characterized in that in order to improve the control accuracy stabilize the allowable temperature difference, product and environment, specify the duration of heat treatment, speed raising and reducing the temperature of the product and the required strength of the product by the end of heat treatment, temperature rise done by the keys with velocity no more than the maximum, while continuously determine the time remaining until the end of heat treatment, taking into account recent and current strength of the product calculate the predicted strength, compare it with desired towards the end of the heat treatment temperature rise stop when reaching the predicted strength not less than required, and the determination of the moment of the beginning of the temperature reduction is done on the time remaining until the end of the heat treatment required for cooling the product, and the reduction temperature lead with a speed not exceeding the maximum allowable. The method is also distinguished by the fact that operational control is not indirect thermometric method, and direct measurement of concrete strength R in real time T, which uses electronic sensors and non-destructive control devices (VHF-1, the pulsar-2 and others), taking reading directly from the concrete at an early age and included in the General system of automated process control (warm-up transformer - KTP, spotlights, electronic sensors and temperature sensors, multi-meter temperature, time of heating and removing evidence of non-destructive testing devices, busbar, the inlet and the heating wire, the unit Registrar, computer); the method takes into account the following the characteristics of the technological process: the speed of temperature rise, the outside temperature, the module surface (massive) design, the coefficient of the casing, the coefficient of ventilation casing, the time of isothermal heating of the concrete taking into account the exothermic properties of the used cement; used three-stage warm-up mode: heating, isothermal curing method "managed thermos and economical warm-up mode during cooling of concrete taking into account the estimated temperature of the concrete and the duration of heating, in which the reduction of energy consumption reaches at least 20%; takes into account the estimated time of set design strength of concrete, for example, 30% R. until formwork design or 70% R. until the possible load of concrete structures; automated control system dynamic, adaptive and is able to automatically adjust the warm-up mode in response to changes of environmental conditions and depending on original data of the specified power consumption mode; system ACS allows for continuous monitoring of obtaining reliable information in real time and to predict the time to reach the design strength of concrete structures with rapid heat treatment using a heating wire elektroprovidnim.

1. Just kept the technology is key required speed of temperature rise of the concrete mixture and the cooling rate of the concrete in conditions of sharply varying external factors (outside air temperature and wind speed), what guarantees the quality of construction products.

2. In addition, performing heat treatment of concrete proposed device provides a set of design specified strength for the shortest period of time with minimum energy consumption.

3. The use of the proposed device in the process of construction of monolithic buildings and structures in sliding and climbing formwork will significantly improve the performance of manufacturing operations while reducing the complexity and improving the quality of construction.

The unit for the operational management of the curing process of concrete, including heating laid mixture by heating using a heating wire or electrodes, measuring the temperature of the mixture, the temperature control of the mixture by changing the electrical characteristics, limiting the temperature of its surface layer by changing the characteristics of the electric current in the process of heat treatment, the temperature measurement and the current strength of the product, the definition of the beginning of the rise of temperature to achieve a product at the stage of preliminary exposure given initial strength and determination of the moment of lowering the temperature of the product, characterized in that, to improve the accuracy of control, stabilize the permissible differential temperature the tours products and the environment, set the duration of the heat treatment, the speed of lifting and lowering the temperature of the product and the required strength of the product by the end of heat treatment, temperature rise operate at a speed not exceeding the maximum allowable, while continuously determine the time remaining until the end of heat treatment, taking into account recent and current strength of the product calculate the predicted strength, compare it with desired towards the end of the heat treatment temperature rise stop when reaching the predicted strength not less than required, and the determination of the moment of the beginning of the temperature reduction is done on the time remaining until the end of the heat treatment required for cooling the product, and the temperature decrease with lead the rate not exceeding the maximum allowable, while operational control is not indirect thermometric method, and direct measurement of concrete strength R in real time T, which uses electronic sensors and non-destructive control devices (VHF-1, the pulsar-2), taking reading directly from the concrete at an early age and included in the General system of automated process control (warm-up transformer - KTP, spotlights, electronic sensors and temperature sensors, multi-channel temperature measuring unit, the belts warm up and reading non-destructive testing devices, busbar, the inlet and the heating wire, the unit Registrar, computer); the method takes into account the following characteristics of the technological process: the rate of rise of temperature, outdoor temperature, the module surface (massive) design, the coefficient of the casing, the coefficient of ventilation casing, the time of isothermal heating of the concrete taking into account the exothermic properties of the used cement; used three-stage warm-up mode: heating, isothermal curing method "managed thermos and economical warm-up mode during cooling of concrete taking into account the estimated temperature of the concrete and the duration of heating, in which the reduction of energy consumption reaches at least 20%; takes into account the estimated time of set design the strength of concrete, for example, 30% R. until formwork design or 70% R. until the possible load of concrete structures; automated control system dynamic, adaptive and is able to automatically adjust the warm-up mode in response to changes of environmental conditions and depending on original data of the specified power consumption mode; system ACS allows for continuous monitoring of obtaining reliable information in real time and to predict the time to achieving the Oia design strength of concrete structures with rapid heat treatment using a heating wire elektroprovodnyh.



 

Same patents:

Curing room // 2454324

FIELD: process engineering.

SUBSTANCE: invention relates to construction and may be used for curing concrete articles. Proposed curing room comprises walls with inner flange, hydraulic gate frame mounted on wall edges, shield with inner surface provided with steam-and-water insulation coating and heat insulation, steam duct, and condensate drain chute. Hydraulic gate frame is made up of horizontal channels arranged horizontally along room walls to house elastic porous material for room sealing by absorbing condensed steam. Aforesaid shield is made up of carcass consisting of weight-reduced channels coated by heat-insulation material with inner cavities. Said shield serves to press elastic porous material against all edges of channel cavity.

EFFECT: high-reliability sealing.

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FIELD: construction.

SUBSTANCE: method for strengthening treatment of concrete products includes exposure of alternating rotary magnetic field with specified value of its intensity and frequency at components used in composition of initial concrete mix, when exposure of alternating rotary magnetic field is provided for all components making concrete without exception after their combination into integral volume directly in the product item itself after realisation of initial mixture components curing operation. This exposure is realised in moulded product without its extraction from used curb. The item itself performs function of closing connecting link in magnetic circuit used for generation of field. Treatment is carried out at intensity of alternating magnetic field 1104-3106 a/m; range of its frequencies 20-70 Hz for 1.5-4.5 hours. Cycles of treatment are repeated twice: in 160-180 hours with a delay of 0.3-0.7 hr and in 480-500 hours with a delay of 0.1-0.2 hour. Device used to realise the method comprises circuit developing alternating magnetic field and electric windings-coils mounted on it and connected to external source of AC current supply. One of plates making magnetic conducting circuit has through slot, dimensions of which make it possible to install the concrete product itself in it together with curb used for its moulding, and its body when installed in circuit serves as closing connecting link that closes magnetic flow generated in it.

EFFECT: improved strength characteristics used to erect objects of concrete building structures.

2 cl, 2 dwg, 3 ex

FIELD: construction, particularly devices for thermal treatment of reinforced structures during in-situ structure erection with the use of automatic temperature condition control means.

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EFFECT: decreased power inputs and possibility to control thermal field transformation after heater switching-on or switching-off in correspondence with thermal limiters of valid regulation documents.

2 cl, 3 dwg

FIELD: building industry; methods of production of the construction products at the building industry works.

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EFFECT: the invention ensures reduction of the power input, improvement of the quality and expansion of list of products.

FIELD: method and equipment for manufacturing gypsum plates.

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EFFECT: improved quality of articles, improved maintenance and operating conditions.

12 cl, 11 dwg

FIELD: building, particularly for concreting cast-in-place and precast reinforced concrete structures along with concrete curing temperature regulation.

SUBSTANCE: method involves laying and compacting concrete mix under continuous concrete mix curing temperature control; heating central concrete layers with heating reinforcement when outer concrete layers are in elasto-plastic state. Heating reinforcement is spaced a distance "a" from surface. The heating is carried out simultaneously with surface heat-shielding. Distance "a" is determined as a=δeq(tav-ts)/(ts-ta), m, where δeq - thickness of conditional equivalent concrete layer corresponding to surface thermal resistance, Rs, m; tav - time-average concrete temperature calculated by estimated time of heating directly in heating area, deg; ts - time-average temperature at concrete surface calculated by estimated heating time, deg; δeq is determined as δeq=Rs·λ·F, m, where Rs is heat resistance of rigging with form Rr including thermal resistance Ra of heat transfer from rigging to ambient air, h·deg/kcal; Rs=Rr+Ra=(δr/( λr·F))+(1/(α·F)), h·deg/kcal, where δr is thickness of rigging, m; λr is rigging heat conductivity factor kcal/(m·h·deg), α is rigging surface heat-transfer coefficient kcal/(m2·h·deg), λ is concrete(reinforced concrete) heat conductivity kcal/(m·h·deg); F=1m2 - rigging surface area for thermal resistance calculation, m2. Amount of heat Q used to heat part of member to be heated having length (height) of 1.0 m and cross-sectional width of 1.0 m is determined from Q=(tav-ts)(m+(τ·λ·F/a), where m is constant equal to 60-180 kcal/deg and τ is calculated heating time, hours. The heating reinforcement is heating wires or pipes adapted for hot water circulation.

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4 cl, 1 ex, 4 dwg

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FIELD: building industry branches, namely apparatuses for heat treatment of constructions of reinforced concrete erected in building site with use of automatic control of heat treatment processes.

SUBSTANCE: apparatus includes concrete form having electric heating units mounted in its boards for convection-irradiation heating of concrete mixture and heating members mounted in bottom of concrete form for convection-irradiation heating; temperature pickups having individual control circuits and connected to inlets of heat regulators. Outlets of heat regulators are connected through switching units having magnetic starters with respective electric heating units. Each control circuit includes at least six temperature pickups placed in monolithic construction and pickup for measuring temperature of environmental air. Said pickups are connected with inlets of respective programmed heat regulator for supplying control signals.

EFFECT: enhanced quality of constructions.

3 cl, 4 dwg

FIELD: apparatus or processes for treating or working, namely curing, setting or hardening, the shaped articles.

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20 cl, 11 dwg

FIELD: building, particularly for concreting cast-in-place and precast reinforced concrete structures along with concrete curing temperature regulation.

SUBSTANCE: method involves laying and compacting concrete mix under continuous concrete mix curing temperature control; heating central concrete layers with heating reinforcement when outer concrete layers are in elasto-plastic state. Heating reinforcement is spaced a distance "a" from surface. The heating is carried out simultaneously with surface heat-shielding. Distance "a" is determined as a=δeq(tav-ts)/(ts-ta), m, where δeq - thickness of conditional equivalent concrete layer corresponding to surface thermal resistance, Rs, m; tav - time-average concrete temperature calculated by estimated time of heating directly in heating area, deg; ts - time-average temperature at concrete surface calculated by estimated heating time, deg; δeq is determined as δeq=Rs·λ·F, m, where Rs is heat resistance of rigging with form Rr including thermal resistance Ra of heat transfer from rigging to ambient air, h·deg/kcal; Rs=Rr+Ra=(δr/( λr·F))+(1/(α·F)), h·deg/kcal, where δr is thickness of rigging, m; λr is rigging heat conductivity factor kcal/(m·h·deg), α is rigging surface heat-transfer coefficient kcal/(m2·h·deg), λ is concrete(reinforced concrete) heat conductivity kcal/(m·h·deg); F=1m2 - rigging surface area for thermal resistance calculation, m2. Amount of heat Q used to heat part of member to be heated having length (height) of 1.0 m and cross-sectional width of 1.0 m is determined from Q=(tav-ts)(m+(τ·λ·F/a), where m is constant equal to 60-180 kcal/deg and τ is calculated heating time, hours. The heating reinforcement is heating wires or pipes adapted for hot water circulation.

EFFECT: reduced temperature stresses and prevention of crack formation during structure concreting, as well as possibility to regulate curing temperature.

4 cl, 1 ex, 4 dwg

FIELD: method and equipment for manufacturing gypsum plates.

SUBSTANCE: method involves the following steps: first step includes molding plate; second step includes hardening by hydration process until hydrated article is produced with hydration extent within the range from 33% to 80%; third step includes continuing hydration process in at least one rotating drum by rotating plate around central axis; fourth step includes drying process. Intermediate cutting process may be provided between second and third steps, said cutting process may be effectuated in accordance with wire principle. Apparatus has linear zone for partial hardening and hydration, and at least one hydration drum comprising central axis around which multiplicity of branches are arranged. Each branch in drum may be divided into multiplicity of levers, with surface of said levers making from about 50% to about 99% the surface of respective branch. Drum may have from 10 to 150 branches, preferably from 40 to 120 branches. Hardening and hydration zone and drum may be arranged in two axes extending in parallel with one another.

EFFECT: improved quality of articles, improved maintenance and operating conditions.

12 cl, 11 dwg

FIELD: building industry; methods of production of the construction products at the building industry works.

SUBSTANCE: the invention is pertaining to the field of building industry, in particular, to the method of production of the construction products at the building industry works and may be used for manufacture of the reinforced concrete, including the spatial structures with the heat-insulating layer. The technical result of the invention is reduction of the power input, improvement of the quality and expansion of list of products. The method of manufacture of double-layer reinforced concrete products includes the consecutive formation of the constructive and the heat-insulating layers of the reinforced concrete and its thermal treatment. The heat-insulating layer with the average density of 450-500 kg/m3 made out of the vermiculite-concrete mixture with flowability of 3-5 cm is molded by the vibrobeam with the simultaneous its reinforcement by the woven net in top level. After the structure achieves the plastic strength of 0.015-0.025 MPa, then begin the molding the constructive layer and conduct the thermal treatment by the method of the contact heating from the side of the heat-insulating layer.

EFFECT: the invention ensures reduction of the power input, improvement of the quality and expansion of list of products.

FIELD: construction, particularly devices for thermal treatment of reinforced structures during in-situ structure erection with the use of automatic temperature condition control means.

SUBSTANCE: device comprises form, heat-sensing means, heaters and computer. Heat-sensing means are placed in form. Heaters are laid on reinforcing cage of monolithic reinforced concrete structure and fixed thereto. Heat-sensing means are linked to automatic digital power regulator including indication and control unit and digital control unit connected with control computer by means of signal converter. To provide visual control automatic power regulator is provided with concrete temperature display panel, which indicates concrete temperature in each measurement point and volumetrically weighed average concrete temperature.

EFFECT: decreased power inputs and possibility to control thermal field transformation after heater switching-on or switching-off in correspondence with thermal limiters of valid regulation documents.

2 cl, 3 dwg

FIELD: construction.

SUBSTANCE: method for strengthening treatment of concrete products includes exposure of alternating rotary magnetic field with specified value of its intensity and frequency at components used in composition of initial concrete mix, when exposure of alternating rotary magnetic field is provided for all components making concrete without exception after their combination into integral volume directly in the product item itself after realisation of initial mixture components curing operation. This exposure is realised in moulded product without its extraction from used curb. The item itself performs function of closing connecting link in magnetic circuit used for generation of field. Treatment is carried out at intensity of alternating magnetic field 1104-3106 a/m; range of its frequencies 20-70 Hz for 1.5-4.5 hours. Cycles of treatment are repeated twice: in 160-180 hours with a delay of 0.3-0.7 hr and in 480-500 hours with a delay of 0.1-0.2 hour. Device used to realise the method comprises circuit developing alternating magnetic field and electric windings-coils mounted on it and connected to external source of AC current supply. One of plates making magnetic conducting circuit has through slot, dimensions of which make it possible to install the concrete product itself in it together with curb used for its moulding, and its body when installed in circuit serves as closing connecting link that closes magnetic flow generated in it.

EFFECT: improved strength characteristics used to erect objects of concrete building structures.

2 cl, 2 dwg, 3 ex

Curing room // 2454324

FIELD: process engineering.

SUBSTANCE: invention relates to construction and may be used for curing concrete articles. Proposed curing room comprises walls with inner flange, hydraulic gate frame mounted on wall edges, shield with inner surface provided with steam-and-water insulation coating and heat insulation, steam duct, and condensate drain chute. Hydraulic gate frame is made up of horizontal channels arranged horizontally along room walls to house elastic porous material for room sealing by absorbing condensed steam. Aforesaid shield is made up of carcass consisting of weight-reduced channels coated by heat-insulation material with inner cavities. Said shield serves to press elastic porous material against all edges of channel cavity.

EFFECT: high-reliability sealing.

2 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to construction, namely, to method of controlling concrete thermal treatment. Proposed device comprises heater to heat laid concrete mix by heating wire or electrodes, measure mix temperature by temperature pickups, and system for automatic control over concrete article heating. Said system is composed of nondestructive control electronic transducers and instruments, i.e. USB-1, Pulsar-2 to take readings directly from early concrete, heating transformer KTP, double-ended lamps, multichannel temperature, heating and data reading interval meter, bus line, feed and heating devices, registrator and computer.

EFFECT: higher accuracy of control, stabilised temperature difference and concrete article and ambient medium.

FIELD: process engineering.

SUBSTANCE: invention relates to construction, namely, to concrete and reinforced concrete article drying chambers. Proposed chamber comprises walls, detachable translucent cover and heat power feed system. Chamber guard structure and said detachable cover are made of combined material including metal, asbestos sheet, foil with heat insulation provided with air layer confined by two layers of foil. Layer of asbestos at chamber inner walls is covered by foil. IR radiators, portable heat sensor are arranged at chamber bottom while water like with sprinklers is laid around the periphery. Electrical protection contact device is arranged ay chamber r top part.

EFFECT: decreased heat losses.

1 dwg

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