The method of injection seal concrete and reinforced concrete structures and cement solutions for its implementation

 

(57) Abstract:

The invention relates to a method of recovering water resistance and improving the strength of the enclosing structures of concrete and reinforced concrete, mostly buried structures. The essence of the invention: according to the method according to the invention, the injection is carried out in the depth of the structures through the point group of injectors, mounted in pre-drilled wells design and located between a hydraulic connection within the sealing part, in three successive stages discharge, with intervals between stages equal to the time of curing previously pumped solution, and the first and second stages use cement mortar of the same composition, but with different water-cement ratio, containing Portland cement, silica fume, surfactants, silica sand fractions less 0,140 mm (0,140-0,315) mm and additionally comprehensive mineral Supplement is a product of a joint grinding aluminate cement "500" with the content of tricalcium aluminate 12-15% by weight of cement, silicates of calcium and silica sand fraction not higher 0,140 mm, at a ratio of 1:1:1. At the final stage of discharge use of tamp what again (25-35)103cm2/g, surfactants, ground quartz sand with beats. surface (3.5 to 4.5)103cm2/g / and additionally specified complex mineral Supplement. The method is carried out for each stage of the discharge mixes in a certain sequence. After operations, the final stage is extracted from wells and bore choke by means of filling them with concrete, composition, wt. % : Portland cement "500" 35,5-40,5; fume 1,5-3,5; ground quartz sand 7,5-9,5; quartz sand fractions (0,140-0,315) 43,5 mm-54,0; specified complex mineral Supplement 4,5 - 5,5; water - the rest, then perform all stages of compaction for a group of injectors next phase. If necessary, after injection of the work put casinoonline cover design by gunning on the surface of the concrete mix or plaster. 3 S. and 1 C.p. f-crystals.

The invention relates to the operation and reconstruction of walling underground and surface structures, in particular, to a method of recovering water resistance and improving the strength of the defective concrete and reinforced concrete structures, mainly underground structures, without the need for external works, with the presses.

The aim of the invention is to expand the field of application of the method, reducing the time and cost of manufacture of works on sealing walling-based cement slurries, providing Ravnopravie seal structure in General.

Known injection method of sealing the filter cracks, including the discharge device for supplying cement mixture for the lining design and installation of fixtures for the implementation of the plugging composition in the cracks, which is used as the sealing patch with a vacuum pump, and sealing cracks is by involving plugging composition in the cracks after discharge its lining [1]

The disadvantage of this method is the limited scope of its application, when repair is subjected to only the defects of the lining, but not the structure itself, and as a cement mixture used is unstable to water and soft material clay suspension.

There is a method of sealing cracks in concrete structures, mainly hydraulic engineering, including injection into the cavity cracks with compressed air powder binder and the introduction of water for curing, and nagnetanija fill the cracks with water, to ensure complete sealing of the cavity [2]

The disadvantage of this method cementation is the ambiguity of the definition of air pressure required to displace the water from cracks and dependent hydrostatic loads on the filter slit, i.e., its location in relation to the water level; the technical complexity of each cycle air feed binder curing powder back filling the cracks with water, as well as uncertainty with the number of such cycles. In addition, this method applies only to eliminate concentrated water leaks through the cracks.

The closest to the essential features and the result achieved by the method is a known method of grouting of concrete structures, comprising the sequential injection of cement mortar with additives and curing, and the injection and curing is carried out at the influence of a magnetic field, and the solution contains cement, it is magnetite and water [3]

The disadvantage of this method is the complexity and the limited scope of its application, requiring the use of the pressure chambers with magnets (electromagnets), the application of which is not always possible in terms of technology and to the its surface layer, i.e., does not solve the problem of sealing structure for its entire depth simultaneously with its strength effort.

A common disadvantage of known methods [1-3] is that they all, solving the local problems of sealing structures in areas of concentrated leaks by plugging the relevant defects (cracks, holes, holes, cavities), do not exclude the possibility of education in such constructions of new defects due to the conservation of the mechanism of destruction and reduction of strength under impact loads.

Known cement slurry, it contains cement, magnetite and water [3] the Disadvantage of the solution is its relatively low values of strength, limiting its scope, and the need for special equipment to apply the solution in the known method [3]

Closest to the claimed backfill mixtures of essential features and technical result is a cement slurry comprising cement, water, surfactants, urea resin, bentonite bentonite and clay inert filler [4]

The disadvantage of this solution is the presence in its composition of the resin, Cotati filling defect sites and then design without vostokovedenie during injection, what creates the opposite effect in solid grouting design in all its depth. In addition, the presence in the solution of the clay aggregates does not provide sufficient durability of the stone.

The proposed grouting solutions contain highly dispersed fillers and aggregates of fine fractions, which will help increase the strength and density and in combination with surfactants allow you to create solutions with the required technological and rheological characteristics. At the same time, these aggregates and fillers do not exclude the possibility of crack formation due to the action of shrinkage stresses, and surfactant reduces the rate of hardening of concrete during the initial period.

To eliminate these disadvantages tampon solutions contain the active complex mineral Supplement (KMD) the product of a joint grinding aluminate cement grade not lower than "500" with the content of tricalcium aluminate 12-15% by weight of cement, silicates of calcium and silica sand fraction not higher 0,140 mm, taken as the ratio of the components were t With a P 1 1 1, respectively, with a specific surface area after grinding (4.5 to 5.0) 10 cm2/,

The mechanism of action of KMD in the mixture is to neutralize reduce speed TV is it and fillers). This is achieved by the fact that the superfine particles of the components were in the process of hydration to form crystals of hydrocortamate vysokoplotnoy phase and slightly basic of calcium hydro that extend the emerging framework of cement and consolidate structures, heat neutralize the shrinkage cracking. At the same time reactionnaire particles KMD promote the binding of the mixing water, the reduction of induction period of the cement test, accelerating intensive beginning of crystal formation, i.e., increase the rate of hardening and strength in the initial period. The regulation of these processes is carried out by dosing of the components KMD, the subtlety of their grinding and adjusting the content of the mixture given CMD.

The presence of quartz sand in the preparation of KMD collaborative delivered its components provides the desired fineness of the particles of the additive, inhibits coagulation, activates particles due to the deployment of new active centers of the grains and the formation of a surface oriented crystals. This allows its use as an additive with a preset and adjustable impact on the properties of cement slurries.

Prepare there is a company-sized mixer, thus envisage the end of cooking for 10-15 min before injection.

The method of injecting the sealing of concrete structures and cement solutions for its implementation ensure the achievement of the following technical results: restoration of water resistance of concrete and concrete structures to values W 16, increasing the strength of material structures in 25-45% reduction in turnaround time by up to 35% reduction in the cost of work on 25-30% of the work without turning off designs from operational loads, excluding external works on opening walling and reverse their embankment, maintaining the technological regimes of existing enterprises.

This is achieved by a method of injection seals, including sequential injection and curing temporarely solutions, forcing them to carry a group of point injectors, hermetically fixed in the sealed part of the structure in a specially prepared wells within each group of injectors in hydraulic communication with each other as in places defects, and in other parts of the construction area so obra etc. upon completion of injection operations in the last group of wells sealing and seal all exposed construction in General, depth and area, and the operation of the injection wells of each group are conducted through the corresponding injectors in three successive stages, with intervals between them equal to the time of curing previously filed design solutions, and the first and second stages use the proposed solution of the same composition, but with different water-cement ratio, and at the final stage use another proposed solution. The parameters of the discharge (pressure system discharge, duration and sequence of operations) can be chosen according to previously established values of the specific water absorption of the structure, its size and degree of defects, provided that the wells in this group have the same or close values of water absorption, and their total value does not exceed the performance injection equipment.

The method is as follows.

After preparing the design for deep compaction, including the consolidation of the wells of the first group of injectors, Assembly and connection of the injection will lineout) parameters discharge working pressure, maximum allowable pressure, the sequence and duration of operations of the discharge, the duration of exposure of the operating pressure on achieving constant flow absorbed solution, the time of pressure reduction and shutdown of the pumping system, the curing time of the solution, its composition and water / cement ratio, and then perform the first stage seal.

For this purpose the discharge capacity load grouting mortar with maximum water-cement ratio equal to 0,65-0,85, depending on the specific water absorption designs, and gently for 15-20 to increase the discharge pressure by controlling the outbreak of the absorption mixture design, to the working pressure, previously installed in the hydraulic testing of the line and is equal to 2.0 to 6.0 kg/cm2and the injection is carried out at this pressure with a constant flow of cement slurry into the design at the level of 0.01 to 0.05 l/min for 3-10 minutes, then for 10-12 slowly reduce the pressure to zero, while the use of cement mortar with the specified water-cement ratio, including Portland cement "500", microsilica, filler, surfactant and the above complex mineral Supplement, the next time you provide warcaby sand fraction (0,140-0,315) mm 35,0-38,0; quartz sand fraction less 0,140 mm 25,0-35,0; SAS 0,25-1,5; specified complex mineral Supplement 4,5-5,5; water the rest.

After the time required for curing injectiong solution, carry out the second stage of discharge for the same group of injectors, why repeat the above operation with the same parameters and discharge in the same sequence as for the previous stage, but the above solution is used with a minimum water-cement ratio equal to 0,35-0,55, and upon completion of the second stage discharge withstand the design prior to curing of the submitted solution.

After the desired curing perform the final third stage seal in the same sequence as in the operations of the first stage, using a solution containing Portland cement "500", aggregate, silica fume, ground quartz sand, surfactant, water and the specified complex mineral additive in the following content, wt. Portland cement "500" 30,5-33,5; fume, Sbeats= (25-35)103cm2/g of 1,5-3,5; ground quartz sand, Sbeats= (3.5 to 4.5)103cm2/g 30,5-33,5; surfactant 0.5-2,0; quartz sand fraction less sustained fashion stage disassembly of the injection system and curing was swabbed composition remove the injectors this group of wells, and wells choke by means of filling them with concrete mix composition, wt. Portland cement "500" 35,0-40,5; fume Sbeats= (25-35)103cm2/g of 1,5-3,5; ground quartz sand Sbeats= (3.5 to 4.5)103cm2/g 7,5-9,5; quartz sand fraction (0,140-0,315) 43,5 mm-54,0; comprehensive mineral Supplement is a product of a joint grinding aluminate cement "500" with contents3And 12-15% by weight of cement, silicates of calcium and silica sand fraction less 0,140 mm in a ratio of 1:1:1 4,5-5,5; water the rest.

Then perform all stages of the discharge in the order specified for the first stage to the subsequent stage wells (groups of injectors).

Achieving the desired technical result control after first-and second-stage injection on the work site, and after the third stage injection in laboratory conditions.

Depending on the degree of defectiveness, the nature of the damage and size of the design method provides without compromising outcomes to seal reduced to the second and third stages for each group of injectors. However, in all versions of works, including reducing the number of stages performed, the placement of the injectors in the defective areas and outside them drilled to design the wells is carried out on condition that the distance between them provide a hydraulic connection of all injectors of this group, and the total water absorption does not exceed the performance of the pumping system.

In specific conditions, operational impacts on the structure, due to increased relative humidity, capillary leak corrosive liquids,harmful gases and dust, after injection seals perform additional work in order to enhance the effect of sealing structures. For this purpose carry out protective coating structures shotcreting under pressure on the surface targetblank mixtures with additives.

The implementation of the method of injecting the seal using the proposed cement slurries provides restoration of density and full monolitnosti

1. The method of injection seal enclosing concrete and reinforced concrete structures, mostly buried, vkljuchajuwih the I whole structure sequentially through the point group of injectors, fixed in a pre-drilled in the sealed part of the design of the wells that are in hydraulic communication with each other, and doing it consistently in each group of injectors in three stages with intermediate exposures between stages equal to the time of curing previously pumped solution, and on the first two stages of the pump solutions composition, wt.

Portland cement "500" 35,5 40,5

Micro silica with a specific surface area (25 35) 103cm2/g 1,5 3,5

Quartz sand fraction less 0,140 mm 25,0 35,0

Quartz sand fractions (0,140 0,315) mm 35,0 38,0

SURFACTANTS 0,25 1,5

Complex mineral additive product of a joint grinding to specific surface (4,5 5,0) 103cm2/g aluminate cement "500" with the contents of C3A 12 to 15% by weight of cement, silicates of calcium and silica sand fraction less 0,140 mm in the ratio 1 1 1 4,5 5,5

Water the Rest

but water / cement ratio of the grout injected in the first stage, is 0.65 to 0.85, the second of 0.35 to 0.55, while the third stage pump solution composition, wt.

Portland cement "500" 30,5 33,5

Micro silica with a specific surface area (25 35) 103cm2/g 1,5 3,5

Mol is the Eney 0,140 mm 25,0 35,0

SURFACTANTS 0,5 2,0

Complex mineral additive product of a joint grinding to specific surface (4,5 5,0) 103cm2/g aluminate cement "500" with contents3And 12 to 15% by weight of cement, silicates of calcium and silica sand fraction less 0,140 mm in the ratio 1 1 1 2,5 4,5

Water the Rest

moreover, at every stage of injection solutions first for 15 to 20 gradually increase the pressure to the worker is equal to 2 to 6 kg/cm2and discharge when the pressure is carried out for 3 to 10 min with constant absorption of the solution is 0.01 to 0.5 l/min with a subsequent reduction of pressure within 10 to 12 to zero, and after the process is complete, the final stage of injection and hardening the injectors are removed from the wells and wells are drowned out by means of filling them with concrete mix composition, wt.

Portland cement "500" 35,5 40,5

Micro silica with a specific surface area (25 35) 103cm2/g 1,5 3,5

Ground quartz sand with a specific surface area (3,5 4,5) 103cm2/g 7,5 9,5

Quartz sand fraction (0,140 0,315) 43,5 mm 54,0

Complex mineral additive product of a joint grinding aluminate cement "500" with contents3And 12 to 15% by weight of the material

2. The method according to p. 1, characterized in that after completion of the injection seal design its surface targetroot.

3. Cement slurry for injection seal concrete and reinforced concrete frame structures, including Portland cement, aggregate, filler, surfactant, and water, characterized in that as a filler it contains quartz sand fraction less 0,140 0,140 mm and 0,315 mm, as fume filler with a specific surface area (25 35) 103cm2/g / and additionally comprehensive mineral Supplement is the product of a joint grinding to specific surface (4,5 5,0) 103cm2/g aluminate cement "500" with contents3And 12 to 15% by weight of cement, silicates of calcium and silica sand fraction less 0,140 mm, taken in the ratio of 1 1 1, with the following content, wt.

Portland cement "500" 35,5 40,5

Fume 1,5 3,5

Quartz sand fraction less 0,140 mm 25,0 35,0

Quartz sand fraction 0,140 0,315 mm 35,0 38,0

SURFACTANTS 0,25 1,5

Comprehensive mineral Supplement 4,5 5,5

Water the Rest

4. Cement slurry for injection seal concrete and reinforced concrete frame structures, including who holds the quartz sand fraction less 0,140 mm, as filler powder, quartz sand with a specific surface area (3,5 4,5) 103cm2/g and micro silica with a specific surface area (25 - 35) 103cm2/g / and additionally comprehensive mineral Supplement product of a joint grinding to specific surface (4,5 5,0) 103cm2/g aluminate cement "500" with contents3And 12 to 15% by weight of cement, silicates of calcium and silica sand fraction less 0,140 mm in the ratio of 1 1 1, with the following content of components of a solution, wt.

Portland cement "500" 30,5 33,5

Fume 1,5 3,5

Ground quartz sand 30,5 33,5

SURFACTANTS 0,5 2,0

Quartz sand fraction less 0,140 mm 25,0 35,0

Comprehensive mineral Supplement 2,5 4,5

Water The Rest

 

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