CN113391056A - Method for improving shrinkage cracking performance of cement-based grouting material - Google Patents
Method for improving shrinkage cracking performance of cement-based grouting material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 228
- 239000004568 cement Substances 0.000 title claims abstract description 122
- 238000005336 cracking Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 68
- 239000000835 fiber Substances 0.000 claims abstract description 55
- 238000002156 mixing Methods 0.000 claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000012216 screening Methods 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 238000012986 modification Methods 0.000 claims abstract description 11
- 230000004048 modification Effects 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 15
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- 238000011056 performance test Methods 0.000 claims description 5
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a method for improving the shrinkage cracking performance of a cement-based grouting material, which comprises the following steps: s1, performing a primary base material screening test to obtain a primary base material; s2, carrying out a secondary base material screening test on the basis of the primary base material to obtain a secondary base material; s3, performing a fiber reinforced modification test on the screened secondary base material, and optimizing the fiber mixing amount to obtain a cement-based grouting dry material; and S4, adding 9-11% of water by mass into the cement-based grouting dry material prepared in the step S3, and uniformly stirring to obtain the improved cement-based grouting material. The method comprises the steps of screening cement-based grouting base materials through related tests, adding different amounts of expanding agents and optimized amounts of fibers, thus obtaining the cement-based grouting material meeting target performance indexes, solving the engineering technical problems of poor early cracking resistance, low tensile property and the like of the cement-based grouting material, improving the mechanical property and durability of the cement-based grouting material, and prolonging the service life of structures and buildings.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a method for improving the shrinkage cracking performance of a cement-based grouting material.
Background
The severe cold and high altitude areas have severe natural conditions such as large day and night temperature difference, severe freeze-thaw cycle, strong solar radiation, strong corrosivity in saline-alkali zones and the like. In the infrastructure construction of the area, the durability of the concrete structure is a key concern of the engineering field. Investigation shows that a large number of built concrete buildings in the Tibet plateau area are damaged to different degrees in severe environment, and the speed is increasing. In particular, concrete structural engineering built in salt lake areas aggravates the erosion of concrete under the multiple actions of saline alkali and other factors, and the normal 'operation' of buildings is seriously threatened. Therefore, the research on the concrete with higher performance has important significance for improving the durability of the concrete and prolonging the service life of the concrete structure in the cold region, and is also the main direction of the current concrete technical research.
The cement-based grouting material is prepared by mixing cement, aggregate, admixture and the like according to a proportion in a manufacturing factory, is mixed with water or other components according to a specific proportion when in use, can be used for bolt anchoring, structural reinforcement, prestressed duct grouting and the like, has the characteristics of high early strength, high fluidity, micro-expansion and the like, is a building material commonly used in many reinforcement projects at present, and belongs to a high-performance concrete series product. The grouting material has the characteristics of high early strength, good flow property, micro-expansion, high strength, easy construction and the like, is widely applied to the reconstruction, reinforcement and repair of the existing buildings, and has good reinforcement effect. Along with the increasingly wide application of the grouting material in emergency reinforcement of building construction, the dependence of projects on the early strength of the cement-based grouting material is higher and higher in order to effectively reduce the construction period and risk. The phenomena of early shrinkage cracking and the like (as shown in figure 1) with different degrees often occur in the construction environment with high cold and high altitude by adopting common grouting materials, and the construction quality of the building and the normal operation of the service period are seriously influenced.
Disclosure of Invention
The invention aims to provide a method for improving the shrinkage cracking performance of a cement-based grouting material, which not only meets the design requirement of target performance, but also has good performance in severe cold environment. The cement-based grouting material solves the engineering technical problems of poor early cracking resistance, low tensile property and the like of the cement-based grouting material, and improves the mechanical property and the durability of the cement-based grouting material to a certain extent, thereby prolonging the service life of structures and buildings.
In order to achieve the above purpose of the present invention, the present invention adopts the following technical scheme:
a method for improving the shrinkage cracking performance of a cement-based grouting material comprises the following steps:
s1, performing a primary base material screening test to obtain a primary base material;
s2, carrying out a secondary base material screening test on the basis of the primary base material to obtain a secondary base material;
s3, carrying out a fiber reinforced modification test on the screened secondary base material, and optimizing the fiber mixing amount to obtain a cement-based grouting dry material;
and S4, adding 9-11% by mass of water into the cement-based grouting dry material prepared in the step S3, uniformly stirring, and discharging to obtain the improved cement-based grouting material.
Specifically, the S1 primary substrate screening test is a fluidity test and a compressive strength test.
Further, the primary base material is a cement-based grouting base material which meets the requirements that the fluidity is not less than 300mm, the fluidity retention value is not less than 260mm in 30min and the compressive strength is not less than 110 MPa.
As a further preferable scheme, the cement-based grouting base material comprises the following components in parts by weight: 42-45 parts of a rubber material, 44-50 parts of an aggregate and 1-3 parts of a water reducing agent.
Preferably, the glue material is prepared from cement and silicon powder according to the following weight ratio of (40-43): 2 in a mass ratio; the aggregate is graded quartz sand with the particle size of less than 5 mm; the water reducing agent is preferably a powder type polycarboxylic acid high-efficiency water reducing agent.
Further, the secondary substrate screening test in S2 is an early shrinkage performance test.
Further, the secondary base material is formed by mixing the primary base material with a certain amount of expanding agent.
Preferably, the expanding agent is a sulphoaluminate expanding agent.
Further, the mixing amount of the expanding agent is determined by the early shrinkage rate of the cement-based grouting material, and specifically, the method for determining the mixing amount of the expanding agent comprises the following steps: on the premise of ensuring that the conditions of fluidity and compressive strength of the primary base material are met, mixing 4-10% (mass percent) of expanding agent with the dosage of the glue material with the primary base material, comparing the influence of the expanding agent with different mixing amounts on the early shrinkage performance of the primary base material, and selecting the mixing amount of the expanding agent which enables the early shrinkage rate of the primary base material to be minimum.
As a further preferable scheme, the method for optimizing the fiber mixing amount in S3 comprises: through experimental analysis, the influence of different types and different doping amounts of fibers with the dosage of 0-20% of the mass of the adhesive material on the performance of the secondary base material is analyzed, and the doping amount of the fibers which meets the target performance index and has the surface crack reduction rate of 90% or more of the cement-based grouting material is selected.
As a further preferable scheme, the fiber is one of copper-plated steel fiber, basalt fiber, polypropylene fiber or carbon fiber.
Compared with the prior art, the invention has the following advantages and effects:
1. according to the invention, the cement-based grouting base material is screened out through a fluidity test and a compressive strength test, then a secondary base material is obtained through early shrinkage performance test screening, then a fiber reinforcement modification test is carried out on the screened secondary base material, the fiber mixing amount is optimized, and finally the method which meets the target performance index and improves the crack resistance of the cement-based grouting material is obtained, so that the engineering technical problems of poor early crack resistance and the like of the common cement-based grouting material are solved.
2. The method for improving the shrinkage cracking performance of the cement-based grouting material reduces the early shrinkage rate of the cement-based grouting material and reduces the generation and development of early shrinkage cracks of the cement-based grouting material on the premise of ensuring fluidity and compressive strength.
3. The method for improving the shrinkage cracking performance of the cement-based grouting material can improve the mechanical property and the durability of the cement-based grouting material and prolong the service life of structures and buildings.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a graph of early shrinkage cracking of a conventional grouting material in a severe environment;
fig. 2 is a graph showing cracking of a cement-based grouting material in a laboratory environment according to the method for improving shrinkage cracking performance of a cement-based grouting material of the present invention;
fig. 3 is a crack pattern of the cement-based grouting material in an air-dry environment, which is obtained by the method for improving the shrinkage cracking performance of the cement-based grouting material according to the present invention;
fig. 4 is a cracking diagram of the cement-based grouting material obtained by the method for improving the shrinkage cracking performance of the cement-based grouting material according to the present invention in a low temperature environment;
FIG. 5 is a cracking diagram of a cement-based grouting material obtained by the method for improving the shrinkage cracking performance of a cement-based grouting material according to the present invention under a simulated severe cold environment;
FIGS. 6(a), (b), (c) and (d) are graphs showing the expansion ratios at different amounts of the swelling agent.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
It should be noted that:
in the examples, the specific conditions are not specified, and the reaction is carried out under the conventional conditions or conditions recommended by the manufacturer unless otherwise specified. All starting materials mentioned in the following examples are obtained from published commercial sources unless otherwise specified.
The present invention will be described in further detail with reference to examples and comparative examples.
Example 1
The present embodiment provides a method for improving the shrinkage cracking performance of a cement-based grouting material, including the steps of:
s1, performing a primary base material screening test to obtain a primary base material;
s2, carrying out a secondary base material screening test on the basis of the primary base material to obtain a secondary base material;
s3, carrying out a fiber reinforced modification test on the screened secondary base material, and optimizing the fiber mixing amount to obtain a cement-based grouting dry material;
and S4, adding 9-11% by mass of water into the cement-based grouting dry material prepared in the step S3, uniformly stirring, and discharging to obtain the improved cement-based grouting material.
According to the invention, the cement-based grouting base material is screened out through related tests, and then a proper amount of expanding agent and an optimized amount of fibers are added to improve the shrinkage cracking performance of the cement-based grouting material, so that the engineering technical problems of poor early cracking resistance, low tensile property and the like of the cement-based grouting material are solved, and the mechanical property and the durability of the cement-based grouting material can be improved to a certain extent, thereby prolonging the service life of structures and buildings.
Example 2
The embodiment relates to a method for improving the shrinkage cracking performance of a cement-based grouting material, which comprises the following steps:
s1, performing a primary base material screening test to obtain a primary base material, wherein the primary base material screening test is a fluidity test and a compressive strength test;
s2, carrying out a secondary base material screening test on the basis of the primary base material to obtain a secondary base material; specifically, the secondary substrate screening test is an early shrinkage performance test;
s3, performing a fiber reinforced modification test on the screened secondary base material, and optimizing the fiber mixing amount to obtain a cement-based grouting dry material;
and S4, adding 9-11% by mass of water into the cement-based grouting dry material prepared in the step S3, uniformly stirring, and discharging to obtain the improved cement-based grouting material.
In this embodiment, the present invention performs primary base material screening on grouting materials of four manufacturers, where the primary base material screening test is a fluidity test and a compressive strength test:
1) the fluidity test procedure is as follows:
prewetting the stirring pot, the stirring blade, the glass plate and the inner wall of the truncated cone circular die. The cement-based grouting material is mixed according to the national standard GB/T50448-2015 technical Specification for application of cement-based grouting materials. And pouring the stirred grouting material into the truncated cone circular mold, wherein the slurry is flush with the upper opening of the truncated cone circular mold. And lifting the truncated cone circular mold, enabling the grouting material to automatically stop under the undisturbed condition, measuring the maximum diffusion diameter of the bottom surface and the diameter in the vertical direction of the bottom surface by using a caliper, calculating an average value as an initial value of fluidity, and finishing the inspection of the initial value within 6min, wherein the test result is accurate to l mm. After the initial value measurement is completed, the grouting material on the glass plate is quickly filled into the stirring pot, and the stirring pot is covered with a damp cloth. 30min after the initial value is measured, the grouting material in the stirring pot is stirred for 240s again according to the fixed program of the stirrer, then the fluidity value is measured as a 30min retention value, and the data is recorded in the table 1.
2) The compressive strength test procedure is as follows:
the standard test piece of compressive strength should adopt a prism with the size of 40mm multiplied by 160mm, and the cement-based grouting material is mixed according to the national standard GB/T50448-. The test of the compressive strength is carried out according to the relevant regulations in the existing national standard of Cement mortar Strength test method (ISO method) GB/T17671. And (3) directly pouring the mixed slurry into a test mold, and properly manually vibrating to enable the slurry to be flush with the upper edge of the test mold. The stirring was started and the molding was completed within 6min, and the test results are shown in Table 1.
TABLE 1 Primary substrate screening test results
Through the fluidity test and the compressive strength test, the cement-based grouting base material with fluidity not less than 300mm, fluidity maintaining value not less than 260mm in 30min and compressive strength not less than 110MPa is preferably used as the primary base material. Still further, the cement-based grouting base material comprises the following components in parts by weight: 42-45 parts of a rubber material, 44-50 parts of an aggregate and 1-3 parts of a water reducing agent; wherein the glue material is prepared from cement and silicon powder according to the weight ratio of (40-43): 2 in a mass ratio; the aggregate is graded quartz sand with the grain diameter less than 5 mm; the water reducing agent is preferably a powder type polycarboxylic acid high-efficiency water reducing agent.
As can be seen from Table 1, the truncated cone fluidity of the manufacturer A meets the requirements of the type II grouting material (the initial value is not less than 340mm, the 30min retention value is not less than 310mm) required in the specification, and the 3d compressive strength value is the highest, so the cement-based grouting material of the manufacturer A is selected as the primary base material (or other type III and above grouting materials meeting the specification requirements) to carry out the subsequent modification test.
Example 3
On the basis of example 2, the secondary base material screening test was an early shrinkage property test, and the swelling agent improved the early shrinkage property of the primary base material, and therefore, the secondary base material was composed of the primary base material mixed with a certain amount of the swelling agent. The early shrinkage performance of the primary base material can be improved by doping the swelling agent accounting for 4-10% of the mass of the rubber material into the primary base material.
Furthermore, the method for determining the mixing amount of the expanding agent comprises the following steps: on the premise of ensuring that the conditions of fluidity and compressive strength of the primary base material are met, mixing an expanding agent with the mixing amount being 4-10% of the mass of the rubber material with the primary base material, comparing the influence of the expanding agent with different mixing amounts on the early shrinkage performance of the primary base material, and selecting the mixing amount of the expanding agent which enables the early shrinkage rate of the primary base material to be minimum.
The early shrinkage performance test (namely the vertical expansion rate test) comprises the following specific procedures:
mixing cement base according to the national standard GB/T50448-containing 2015And (4) grouting materials. And (3) flatly placing the glass plate in the middle position of the test mold, slightly pressing the glass plate, and pouring the mixture into the test mold from one side at one time until the mixture overflows from the other side and is about 2mm higher than the edge of the test mold. Vertically placing the measuring head of the dial indicator in the center of the glass plate, firmly installing the measuring head, and reading the initial reading h of the dial indicator within 30so. The forming process is completed within 3min after the stirring is finished, and the readings h of the dial indicator are respectively read within 3h and 24h from the time of adding water and stirringt. The cotton silk should be kept moist in the whole measuring process, the device should not be vibrated, and the forming and maintaining temperature is 20 +/-2 ℃. The test data are shown in FIGS. 6(a), (b), (c), and (d). The result shows that when the mixing amount of the expanding agent is more than 2 parts, the expansion performance of the grouting material meets the standard requirement and achieves a stable effect.
The invention reduces the early shrinkage rate of the cement-based grouting material and reduces the generation and development of early shrinkage cracks of the cement-based grouting material on the premise of ensuring fluidity and compressive strength.
Example 4
On the basis of the embodiment 3, a fiber reinforced modification test is further carried out on the screened secondary base material, and the fiber mixing amount is optimized to obtain a cement-based grouting dry material; the specific method comprises the following steps: through experimental analysis on the influence of different types and different doping amounts of fibers accounting for 0-20% of the mass of the rubber material on the performance of the secondary base material, the fiber doping amount which meets the target performance index and enables the surface crack reduction rate of the cement-based grouting material to reach 90% or more is selected. It is further noted that the fiber type is preferably one of copper-plated steel fiber, basalt fiber, polypropylene fiber or carbon fiber.
Specifically, the fiber reinforcement modification test procedure was as follows:
and carrying out a fiber modification test on the optimized secondary base material to obtain the improved cement-based grouting material, wherein the improved cement-based grouting material comprises 44 parts of glue material, 51 parts of aggregate and 1 part of water reducing agent by weight, and the mixing amounts of the glue material, the aggregate and the water reducing agent are respectively 2 parts and the fiber are respectively 0 part, 2.5 parts, 5 parts and 7.5 parts.
Referring to the test method of early crack resistance of mortar, a flat plate with the thickness of 25mm and the thickness of 600mm x 800mm is manufactured, crack resistance tests are developed under the same laboratory environment (the temperature is 20 +/-2 ℃, the humidity is 60 +/-5 percent, and the flat plate is kept still without wind), the shrinkage and cracking conditions of the cement-based grouting material under different fiber doping amounts are observed, the improvement of the shrinkage performance of the cement-based grouting material by the different fiber doping amounts is analyzed, and the test results are detailed in table 2.
Example 5
In this embodiment, the cement-based grouting material obtained through the method for improving the shrinkage cracking performance of the cement-based grouting material comprises, by weight, 44 parts of a glue material, 51 parts of an aggregate, 1 part of a water reducing agent, 11 parts of water, 2 parts of an expanding agent, and 0 part, 2.5 parts, 5 parts, and 7.5 parts of a fiber.
Referring to the test method of early crack resistance of mortar, a flat plate with the thickness of 25mm and the thickness of 600mm x 800mm is manufactured, a shrinkage crack resistance test is carried out under the condition of the same air drying environment (the temperature is 20 +/-2 ℃, the humidity is 40% +/-5%, and the wind speed is 5m/s), the shrinkage cracking conditions of the cement-based grouting material under different fiber mixing amounts are observed, the improvement of the shrinkage performance of the cement-based grouting material by different fiber mixing amounts is analyzed, and the test results are detailed in table 2.
Example 6
In this embodiment, the cement-based grouting material obtained through the method for improving the shrinkage cracking performance of the cement-based grouting material comprises, by weight, 44 parts of a glue material, 51 parts of an aggregate, 1 part of a water reducing agent, 11 parts of water, 2 parts of an expanding agent, and 0 part, 2.5 parts, 5 parts, and 7.5 parts of a fiber.
Referring to a test method for early crack resistance of mortar, a flat plate with the thickness of 25mm and the thickness of 600mm x 800mm is manufactured, a shrinkage crack resistance test is performed under the same low-temperature environment (the temperature is 5-8 ℃, the humidity is 50% +/-5%, and the flat plate is kept still), the shrinkage crack conditions of the cement-based grouting material under different fiber doping amounts are observed, the improvement of the shrinkage performance of the cement-based grouting material due to different fiber doping amounts is analyzed, and the test results are detailed in table 2.
Example 7
In this embodiment, the cement-based grouting material obtained through the method for improving the shrinkage cracking performance of the cement-based grouting material comprises, by weight, 44 parts of a glue material, 51 parts of an aggregate, 1 part of a water reducing agent, 11 parts of water, 2 parts of an expanding agent, and 0 part, 2.5 parts, 5 parts, and 7.5 parts of a fiber.
Referring to a test method for early crack resistance of mortar, a flat plate with the thickness of 600mm x 800mm and the thickness of 25mm is manufactured, a shrinkage crack resistance test is developed under the same conditions of simulating severe cold environment (temperature of 5-8 ℃, humidity of 40 +/-5%, and wind speed of 5m/s), shrinkage cracking conditions of cement-based grouting materials under different fiber mixing amounts are observed, improvement of shrinkage performance of the cement-based grouting materials by the different fiber mixing amounts is analyzed, and test results are detailed in table 2.
TABLE 2 shrinkage test of cement-based grouting material after improvement
| Amount of fiber blended | Example 4 | Example 5 | Example 6 | Example 7 |
| 0 portion of | Cracking (3 cracks) | Cracking (5 cracks) | Cracking (3 cracks) | Cracking (6 cracks) |
| 2.5 parts of | Without cracks | Without cracks | Without cracks | Cracking (1 crack) |
| 5 portions of | Without cracks | Without cracks | Without cracks | Without cracks |
| 7.5 parts of | Cracking (1 crack) | Cracking (2 cracks) | Cracking (1 crack) | Cracking (1 crack) |
It can be seen from table 2 that the improved cement-based grouting material of the present invention has no cracking phenomenon in the laboratory environment (as shown in fig. 2), the air-dry environment (as shown in fig. 3) and the low temperature environment (as shown in fig. 4) when the amount of the expanding agent is 2.5% to 5%. Under the simulated severe cold (as shown in figure 5) environment, no cracking phenomenon occurs when the fiber content is 5 parts.
Example 8
The embodiment relates to a method for improving the shrinkage cracking performance of a cement-based grouting material, which comprises the following steps:
s1, obtaining a primary base material through a fluidity test and a compression strength test, wherein the primary base material comprises the following components: 42-45 parts of a rubber material, 44-50 parts of an aggregate and 1-3 parts of a water reducing agent; wherein the glue material is prepared from cement and silicon powder according to the weight ratio of (40-43): 2 in a mass ratio; the aggregate is graded quartz sand with the grain diameter less than 5 mm;
s2, on the premise of ensuring that the conditions of fluidity and compressive strength of the primary base material are met, mixing an expanding agent accounting for 4-10% of the mass of the rubber material with the primary base material, comparing the influence of expanding agents with different mixing amounts on the early shrinkage performance of the primary base material, screening to obtain the mixing amount of the expanding agent which enables the early shrinkage rate of the primary base material to be minimum, and obtaining a secondary base material formed by mixing the primary base material and the expanding agent;
s3, analyzing the influence of different types of fibers accounting for 0-20% of the mass of the rubber material on the performance of the secondary base material through a fiber reinforced modification test, and screening the fiber mixing amount which enables the surface crack reduction rate of the cement-based grouting material to reach 90% or more as the optimal fiber mixing amount;
s4, putting the glue material, the aggregate, the water reducing agent and the expanding agent in the formula ratio into a stirrer in sequence, dry-mixing for 60-120S at a stirring speed of 135-145 r/min, adding the optimal fiber mixing amount of S3, and mixing and stirring for 60-120S to obtain the cement-based grouting dry material;
and S5, adding 9-11% by mass of water into the cement-based grouting dry material prepared in the step S4, and uniformly stirring to obtain the improved cement-based grouting material.
In this example, 44 parts of a glue material, 51 parts of an aggregate, 1 part of a water reducing agent, 2 parts of an expanding agent, and 5 parts of a fiber are further mixed to obtain a cement-based grouting dry material, and then 11% by mass of water is added to the obtained cement-based grouting dry material, and the mixture is uniformly stirred to obtain a cement-based grouting material a.
And respectively testing the fluidity, compressive strength and vertical expansion rate of the obtained cement-based grouting material A and the existing cement-based grouting material B in the market. The results are shown in Table 3:
table 3 shows the results of comparative tests between the cement-based grouting material A and the existing cement-based grouting material B on the market
The results in table 3 show that, compared with the existing cement-based grouting materials in the market, the cement-based grouting material obtained by the method for improving the shrinkage cracking performance of the cement-based grouting material provided by the invention has better fluidity, the vertical expansion rate meets the standard of class II grouting materials required by the specification, and the 3d compressive strength is higher.
In conclusion, the method for improving the shrinkage cracking performance of the cement-based grouting material solves the engineering technical problems of poor early cracking resistance and the like of the common cement-based grouting material, reduces the early shrinkage rate of the cement-based grouting material, reduces the generation and development of early shrinkage cracks of the cement-based grouting material, improves the mechanical property and the durability, and prolongs the service life of structures and buildings on the premise of ensuring the fluidity and the compressive strength.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (10)
1. A method for improving the shrinkage cracking performance of a cement-based grouting material is characterized by comprising the following steps:
s1, performing a primary base material screening test to obtain a primary base material;
s2, carrying out a secondary base material screening test on the basis of the primary base material to obtain a secondary base material;
s3, performing a fiber reinforced modification test on the screened secondary base material, and optimizing the fiber mixing amount to obtain a cement-based grouting dry material;
and S4, adding 9-11% by mass of water into the cement-based grouting dry material prepared in the step S3, uniformly stirring, and discharging to obtain the improved cement-based grouting material.
2. The method for improving the shrinkage cracking performance of a cement-based grouting material according to claim 1, wherein: the S1 primary substrate screening test is a fluidity test and a compressive strength test.
3. A method for improving the shrinkage cracking performance of a cement-based grouting material as claimed in claim 1 or 2, wherein: the primary base material is a cement-based grouting base material which meets the requirements that the fluidity is not less than 300mm, the fluidity retention value is not less than 260mm in 30min and the compressive strength is not less than 110 MPa.
4. The method for improving the shrinkage cracking performance of a cement-based grouting material according to claim 3, wherein the cement-based grouting base material comprises the following components in parts by weight: 42-45 parts of a rubber material, 44-50 parts of an aggregate and 1-3 parts of a water reducing agent.
5. The method for improving the shrinkage cracking performance of a cement-based grouting material according to claim 4, wherein: the glue material is prepared from cement and silicon powder according to the following weight ratio (40-43): 2 in a mass ratio; the aggregate is graded quartz sand with the particle size of less than 5 mm.
6. A method for improving the shrinkage cracking performance of a cement-based grouting material according to claim 3, wherein: the secondary substrate screening test in S2 is an early shrinkage performance test.
7. The method for improving the shrinkage cracking performance of a cement-based grouting material according to claim 6, wherein: the secondary base material is formed by mixing the primary base material with a certain amount of expanding agent.
8. The method for improving the shrinkage cracking performance of a cement-based grouting material according to claim 7, wherein the amount of the swelling agent is determined by: on the premise of ensuring that the conditions of fluidity and compressive strength of the primary base material are met, mixing an expanding agent with the mixing amount being 4-10% of the mass of the rubber material with the primary base material, comparing the influence of the expanding agent with different mixing amounts on the early shrinkage performance of the primary base material, and selecting the mixing amount of the expanding agent which enables the early shrinkage rate of the primary base material to be minimum.
9. The method for improving the shrinkage cracking performance of a cement-based grouting material according to claim 1, wherein the method for optimizing the fiber content comprises: through experimental analysis of the influence of different types and different doping amounts of fibers on the performance of the secondary base material, the fiber doping amount is selected so that the surface crack reduction rate of the cement-based grouting material reaches 90% or more.
10. The method for improving the shrinkage cracking performance of a cement-based grouting material according to claim 8, wherein: the fiber type is one of copper-plated steel fiber, basalt fiber, polypropylene fiber or carbon fiber.
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