CN108609972B - High-strength quick-hardening anchor rod grouting material - Google Patents
High-strength quick-hardening anchor rod grouting material Download PDFInfo
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- CN108609972B CN108609972B CN201810569238.4A CN201810569238A CN108609972B CN 108609972 B CN108609972 B CN 108609972B CN 201810569238 A CN201810569238 A CN 201810569238A CN 108609972 B CN108609972 B CN 108609972B
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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
- 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
- C04B28/06—Aluminous 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
A high-strength quick-hardening anchor rod grouting material comprises cement, water, fly ash, quartz sand, a water reducing agent and a retarder, wherein the weight ratio of the fly ash to the cement is (0.25-1): 1, the weight ratio of the water to the total mass of the cement and the fly ash is (0.4-0.42): 1, the weight ratio of the quartz sand to the total mass of the cement and the fly ash is (0.50-0.8): 1, the weight ratio of the water reducing agent to the total mass of the cement and the fly ash is (0.5-0.90%): 1, and the weight ratio of the retarder to the total mass of the cement and the fly ash is (0.04-0.08%): 1. The invention realizes the high-strength quick-hardening performance of stratum grouting reinforcement and anchor rod grouting reinforcement, the 4h compressive strength is more than 10MPa, and the invention has better fluidity, and the initial setting time is 40 +/-5 min. The grouting material can achieve the purposes of early strength and rapid hardening, and has low price and strong operability.
Description
Technical Field
The invention relates to a high-strength quick-hardening anchor rod grouting material, and belongs to the technical field of grouting materials.
Background
China is the world with the largest tunnel engineering scale, the largest quantity and the fastest construction speed. 14040km/15181 highway tunnels are built up by 2016, 15781 railway tunnels are built up by 2017, and by 2020, the built-up mileage of the high-speed railway in China reaches 3 kilometers (2.2 kilometers currently), and 0.8 kilometer needs to be added; the highway is built for 15 kilometers (13.1 kilometers at present), and 1.9 kilometers are additionally added. In addition, the plan also indicates: the short traffic development in the middle and western region is obvious and lags relatively, and the channel construction in the middle and western region is reinforced. The midwestern region caters for a new round of traffic infrastructure construction climax.
The areas of the middle and western parts mainly use mountainous regions and heavy dunes, the terrain and geological conditions are complex and changeable, and a large amount of tunnel engineering can be inevitably met in the development of traffic. With the improvement of the construction standard and the construction scale of the tunnel, the safe and efficient crossing of the high ground stress soft rock area faces huge challenges, particularly the problem of large deformation of the high ground stress soft rock is prominent when the high ground stress soft rock area crosses a weak loose broken rock stratum, and the existing theoretical method and the construction technical level of the tunnel cannot meet the requirements of engineering disaster prevention and reduction. For example: the length of a Yu railway village tunnel built into a general train in 2017 months of 9 is 19.1km, surrounding rocks mainly comprise carbon plate rocks, large deformation occurs in the construction process, the maximum convergence deformation reaches 2.59m, the maximum arch settlement reaches 1.81m, the invasion limit, cracking and local collapse of primary support and secondary lining are caused, an arch frame is forced to be frequently disassembled and replaced, the construction period is delayed by 33 months, and the social influence is severe.
According to different grouting objects and purposes, grouting in the tunnel can be divided into: grouting collapse bodies, stopping water in tunnels, grouting foundation reinforcement, grouting stratum reinforcement, grouting anchor rods and the like. Stratum grouting and anchor rod reinforcement (such as yielding anchor rods) are the most effective and common engineering measures for controlling large deformation of weak loose broken strata. Therefore, the performance of the slurry is particularly important for the tunnel grouting project. The grouting material is the key for reinforcing the weak surrounding rock to form a reinforcing ring and a bearing arch and providing the anchoring force of the anchor rod. In the design of grouting engineering, the selection of grout is an important ring, and the selection directly influences the quality of grouting and the construction cost. The selected slurry should be different because of different purpose and requirement of grouting. The common grouting material used in the tunnel engineering is ordinary portland cement paste, the setting time of the cement paste (the water cement ratio is calculated by 0.5) is usually more than 5h, and the tunnel is subjected to 1 blasting construction according to the normal working procedure of the tunnel. The tunnel primary support is poor in structural stability, settlement deformation often occurs under the action of self weight and blasting disturbance additional load, multiple parts can reach 100-200 mm/d, cement grout filled around an anchor rod still has no or only very small strength and bond stress, the anchoring force of the anchor rod, the suspension effect of the primary support and the extrusion reinforcement effect of surrounding rocks cannot be effectively exerted in time, the surrounding rocks and the primary support are separated, the overlying rocks lose support constraint, the soft rock cohesion is very small, the additional load generated by self weight and construction disturbance is difficult to overcome, downward sliding and loosening are generated on the arch rock, an arch loosening area is enlarged, the structural stability of the primary support is further deteriorated, the problems of instability damage of the primary support such as steel frame distortion, fracture of sprayed concrete and the like occur, and the occurrence of large deformation disasters is aggravated. Therefore, the prevention and control of large deformation tunnels is often very difficult and difficult to achieve. Therefore, the grouting material commonly used for stratum reinforcement and anchor rod reinforcement aiming at the prevention and treatment of large deformation disasters of weak, loose and broken stratum tunnels has the following defects:
(1) lack of pertinence. The method has no pertinence to the characteristics and mechanism of large deformation and catastrophe of weak loose broken stratum tunnels, and has undesirable prevention and control effects.
(2) The early strength is low. The surrounding rock cannot be reinforced and the anchoring force of the anchor rod cannot be provided in time, and the primary support is easy to subside and deform under the action of frequent construction disturbance (especially blasting vibration) and is separated from the surrounding rock, so that the overlying surrounding rock is pulled to be loosened, and a large deformation disaster is induced.
(3) The slurry coagulation speed is slow. Is easy to dilute and run off under the action of underground water, and causes poor grouting quality.
(4) The water-cement ratio is not reasonable. Cement grout with the W/C ratio of 1:1 which is too dilute is frequently used in tunnel grouting engineering.
(5) Has little effect and obvious adverse effect. For soft rock, common silicate cement slurry commonly used in tunnels not only has no due effect and little reinforcing or anchoring effect, but also has the characteristics of over-dilute water cement ratio, low setting speed and the like, so that the soft rock is soaked for a long time, the softening effect is obvious, the strength is rapidly degraded and attenuated, and the instability and damage of surrounding rock are induced. Meanwhile, the load of surrounding rocks covered on the tunnel is increased, and the large deformation disaster of the soft rock tunnel is aggravated.
(6) The dosage on the tunnel grouting site is inaccurate, and the grouting effect is influenced. For the slurry with complicated grouting material (especially excessive admixture), the condition of adding some admixture in a leakage way or repeatedly adding more admixtures is easy to occur, and the process is complicated and is not easy to popularize and apply.
Therefore, the grouting material is suitable for weak and loose broken stratums, meets the grouting requirement of the large-deformation tunnel in the complex construction environment, and is simple and practical in proportioning, strong in operability, low in price and excellent in performance.
Disclosure of Invention
The invention aims to provide a high-strength quick-hardening anchor rod grouting material which is low in price, simple and easy to prepare.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-strength quick-hardening anchor rod grouting material comprises cement, water, fly ash, quartz sand, a water reducing agent and a retarder, wherein the weight ratio of the fly ash to the cement is (0.25-1): 1, the ratio of the mass of the water to the total mass of the cement and the fly ash is (0.4-0.42): 1, the ratio of the mass of the quartz sand to the total mass of the cement and the fly ash is (0.50-0.8): 1, the ratio of the mass of the water reducing agent to the total mass of the cement and the fly ash is (0.5-0.90%): 1, and the ratio of the mass of the retarder to the total mass of the cement and the fly ash is (0.04-0.08%): 1.
The invention is further improved in that the particle size of the quartz sand is 35-70 meshes.
A further improvement of the invention is that the cement is a fast hardening sulphoaluminate 425 cement.
The invention is further improved in that the fly ash is class I fly ash.
The invention has the further improvement that the water reducing agent is a polycarboxylic acid liquid water reducing agent.
A further improvement of the invention is that the retarder is citric acid.
The invention is further improved in that the weight ratio of the fly ash to the cement is (0.25-0.5): 1.
A further improvement of the invention is that the weight ratio of fly ash to cement is 0.5: 1.
Compared with the grouting material which is universal for tunnel engineering, the grouting material has the following beneficial effects:
(1) high strength and quick hardness. Aiming at the characteristics of large deformation disasters of weak loose broken stratum tunnels, the invention fully realizes the high-strength quick-hardening performance of stratum grouting reinforcement and anchor rod grouting reinforcement by adopting cement, water, fly ash, quartz sand, a water reducing agent and a retarder in proper proportion, has the 4h compressive strength of more than 10MPa, can effectively play the roles of reinforcement and suspension in time, and has extremely obvious effect through the field practical application of Weiwu high-speed woodvillage tunnels. And has good fluidity, and the initial setting time is 40 plus or minus 5 min.
(2) Reasonable proportion and strong operability. The grouting material provided by the invention takes cement as a cementing material, so that the aims of early strength and quick hardening are fulfilled; the cement consumption is saved by adding the fly ash, and the pumpability of the slurry is enhanced; the frictional resistance is effectively improved and the shrinkage and creep of cement are improved by doping the quartz sand; the water consumption is reduced by adding the water reducing agent, and the strength of the mortar is effectively improved; the setting time of the slurry is adjusted by the retarder which has excellent performance, low price and convenient material obtaining. The tunnel on-site feeding and mixing are simple, the operability is strong, and the batching accuracy and the grouting efficiency can be greatly improved.
(3) High permeability and high calculi rate. The cement fly ash mortar provided by the invention can permeate into joint cracks of a loose and broken stratum, is high in calculus rate and large in friction coefficient, and can effectively reinforce surrounding rocks and provide the effect of uplift resistance.
(4) Low cost and is suitable for popularization. On the premise of meeting the test and engineering requirements, compared with cement paste, the grouting material provided by the invention can reduce the cement consumption by 30% -60% by adding fly ash and sand, is low in price and easy to popularize, and really realizes social benefits of excellent performance, low price and easy popularization.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In each embodiment of the invention, rapid hardening sulphoaluminate 425 cement is selected as a cementing material in a slurry ratio, an admixture is I-grade fly ash, an aggregate is quartz sand, an additive is a polycarboxylic acid high-efficiency liquid water reducing agent, and a retarder is industrial citric acid. A grouting material which is convenient to construct, high in strength and high in hardness is prepared through a single-factor control test and a high-durability test in an optimized mode, grouting parameters obtained through an indoor anchoring grouting matching ratio test are combined, and a Weiwu high-speed woodhai tunnel is adopted as an engineering support and put into practical application.
The grouting material comprises cement, water, fly ash, quartz sand, a water reducing agent and a retarder, wherein the weight ratio of the fly ash to the cement is (0.25-1): 1, the ratio of the mass of the water to the total mass of the cement and the fly ash is (0.4-0.42): 1, the ratio of the quartz sand to the total mass of the cement and the fly ash is (0.50-0.8): 1, the ratio of the water reducing agent to the total mass of the cement and the fly ash is (0.5-0.90%): 1, and the ratio of the retarder to the total mass of the cement and the fly ash is (0.04-0.08%): 1. The particle size of the quartz sand is 35-70 meshes, the cement is 425 rapid hardening sulphoaluminate cement, the fly ash is I-grade fly ash, the water reducing agent is a polycarboxylic acid liquid water reducing agent, and the retarder is citric acid.
The preparation method of the grouting material comprises the following steps: and uniformly mixing the cement, the water, the fly ash, the quartz sand, the water reducing agent and the retarder.
Example 1
The grouting material of cement mortar comprises cement, water, I-grade fly ash, quartz sand (35-70 meshes) and an additive (comprising a water reducing agent and a retarder), wherein the weight ratio of the I-grade fly ash to the cement is 0.50:1, the weight ratio of the water to a cementing material (a mixture of the cement and the I-grade fly ash) is 0.40:1, the weight ratio of the quartz sand to the cementing material (a mixture of the cement and the I-grade fly ash) is 1:1, and the weight ratio of the water reducing agent to the cementing material (a mixture of the cement and the I-grade fly ash) is as follows: 0.90 percent to 1, wherein the weight ratio of the retarder to the cementing material (the mixture of cement and I-grade fly ash) is as follows: 0.08 percent to 1. The grouting material prepared by adopting the proportion can meet two indexes of high strength, fast hardness and good fluidity aiming at the tunnel grouting material of the weak and loose broken stratum.
Example 2
The grouting material of cement mortar comprises cement, water, I-grade fly ash, quartz sand (35-70 meshes) and an additive (comprising a water reducing agent and a retarder), wherein the weight ratio of the I-grade fly ash to the cement is 1:1, the weight ratio of the water to a cementing material (a mixture of the cement and the I-grade fly ash) is 0.40:1, the weight ratio of the quartz sand to the cementing material (a mixture of the cement and the I-grade fly ash) is 0.50:1, and the weight ratio of the water reducing agent to the cementing material (a mixture of the cement and the I-grade fly ash) is as follows: 0.90 percent to 1, wherein the weight ratio of the retarder to the cementing material (the mixture of cement and I-grade fly ash) is as follows: 0.04% to 1. The grouting material prepared by adopting the proportion can meet two indexes of high strength, fast hardness and good fluidity aiming at the tunnel grouting material of the weak and loose broken stratum.
Example 3
A grouting material of cement mortar comprises cement, water, I-grade fly ash, quartz sand (35-70 meshes) and an additive (comprising a water reducing agent and a retarder), wherein the weight ratio of the I-grade fly ash to the cement is 0.25:1, the weight ratio of the water to a cementing material (a mixture of the cement and the I-grade fly ash) is 0.42:1, the weight ratio of the quartz sand to the cementing material (a mixture of the cement and the I-grade fly ash) is 0.80:1, and the weight ratio of the water reducing agent to the cementing material (a mixture of the cement and the I-grade fly ash) is as follows: 0.50 percent to 1, wherein the weight ratio of the retarder to the cementing material (the mixture of cement and I-grade fly ash) is as follows: 0.08 percent to 1. The grouting material prepared by adopting the proportion can meet two indexes of high strength, fast hardness and good fluidity aiming at the tunnel grouting material of the weak and loose broken stratum.
Example 4
The grouting material of cement mortar comprises cement, water, I-grade fly ash, quartz sand (35-70 meshes) and an additive (comprising a water reducing agent and a retarder), wherein the weight ratio of the I-grade fly ash to the cement is 0.50:1, the weight ratio of the water to a cementing material (a mixture of the cement and the I-grade fly ash) is 0.42:1, the weight ratio of the quartz sand to the cementing material (a mixture of the cement and the I-grade fly ash) is 0.50:1, and the weight ratio of the water reducing agent to the cementing material (a mixture of the cement and the I-grade fly ash) is as follows: 0.60 percent to 1, wherein the weight ratio of the retarder to the cementing material (the mixture of cement and I-grade fly ash) is as follows: 0.04% to 1. The grouting material prepared by adopting the proportion can meet two indexes of high strength, fast hardness and good fluidity aiming at the tunnel grouting material of the weak and loose broken stratum.
Furthermore, the cement is rapid hardening sulphoaluminate 425 cement (initial setting for 15 min), the retarder is citric acid, the side length of the test piece is 40mm, the span is 100mm, and the loading speed is 50N/S.
TABLE 1 indoor mix proportion test of novel grouting material to which the invention relates
As can be seen from Table 1, the 4 selected slurries can meet the two indexes of fluidity and high strength and quick hardness by adjusting the relative proportion of the ingredients aiming at two different water-cement ratios (0.40 and 0.42). And the setting time of the slurry is improved along with the increase of the content of the retarder, and the strength of the test piece is stably improved along with the increase of the age.
Further, the anchor rod grouting and drawing test is carried out on the outdoor slope selected in the embodiment 1, the sampling is carried out on site, the test piece is brought back to a laboratory for maintenance, the specification of the test piece is 70.7mm multiplied by 70.7mm, a mechanical stirring mode is adopted, the model number of a compression testing machine is HYZ-300.10, and the loading speed is 1.3 kN/S.
TABLE 2 field sampling strength test recording table
As can be seen from Table 2, in the field sampling test of the cement fly ash mortar, the compressive strength of the cement fly ash mortar is increased along with the increase of the curing time of the test piece, and the compressive strength of the cement fly ash mortar can reach 28MPa at 28 d. It should be noted that the average compressive strength for the test pieces was calculated as follows: if one of the six measured values exceeds + -10% of the six average values, deleting the data and taking the average of the remaining compressive strengths as the final average data; if there is still recorded data in the remaining five test values that exceeds the mean value by + -10%, the test results for this test block are invalidated.
Further, the side anchor grouting and drawing test was carried out using portland cement (425R) neat cement having a water cement ratio of 0.4 and the grouting material of the mix ratio of example 1. The test results are listed in table 3.
TABLE 3 Anchor rod pullout test results
As shown in Table 3, the anchoring effect of the novel grouting material is far higher than that of the common Portland cement paste, and the 4h drawing force of the novel grouting material is 4 times that of the 7 d-age common Portland cement paste. At the same time, its anchoring force increases with increasing bolt diameter and length. Therefore, the novel grouting material provided by the invention realizes the purpose of high-strength and quick-hardening tests, has extremely obvious anchoring effect, meets the requirement of large deformation of engineering prevention and treatment soft rock tunnels, and has obvious popularization and application values due to simple and practical proportioning and strong operability.
Example 5
The grouting material of cement mortar comprises cement, water, I-grade fly ash, quartz sand (35-70 meshes) and an additive (comprising a water reducing agent and a retarder), wherein the weight ratio of the I-grade fly ash to the cement is 0.75:1, the weight ratio of the water to a cementing material (a mixture of the cement and the I-grade fly ash) is 0.41:1, the weight ratio of the quartz sand to the cementing material (a mixture of the cement and the I-grade fly ash) is 0.60:1, and the weight ratio of the water reducing agent to the cementing material (a mixture of the cement and the I-grade fly ash) is as follows: 0.70 percent to 1, wherein the weight ratio of the retarder to the cementing material (the mixture of cement and I-grade fly ash) is as follows: 0.05 percent to 1. The grouting material prepared by adopting the proportion can meet two indexes of high strength, fast hardness and good fluidity aiming at the tunnel grouting material of the weak and loose broken stratum.
Example 6
The grouting material of cement mortar comprises cement, water, I-grade fly ash, quartz sand (35-70 meshes) and an additive (comprising a water reducing agent and a retarder), wherein the weight ratio of the I-grade fly ash to the cement is 0.80:1, the weight ratio of the water to a cementing material (a mixture of the cement and the I-grade fly ash) is 0.42:1, the weight ratio of the quartz sand to the cementing material (a mixture of the cement and the I-grade fly ash) is 0.70:1, and the weight ratio of the water reducing agent to the cementing material (a mixture of the cement and the I-grade fly ash) is as follows: 0.80 percent to 1, wherein the weight ratio of the retarder to the cementing material (the mixture of cement and I-grade fly ash) is as follows: 0.06 percent to 1. The grouting material prepared by adopting the proportion can meet two indexes of high strength, fast hardness and good fluidity aiming at the tunnel grouting material of the weak and loose broken stratum.
Example 7
The grouting material of cement mortar comprises cement, water, I-grade fly ash, quartz sand (35-70 meshes) and an additive (comprising a water reducing agent and a retarder), wherein the weight ratio of the I-grade fly ash to the cement is 0.40:1, the weight ratio of the water to a cementing material (a mixture of the cement and the I-grade fly ash) is 0.42:1, the weight ratio of the quartz sand to the cementing material (a mixture of the cement and the I-grade fly ash) is 0.80:1, and the weight ratio of the water reducing agent to the cementing material (a mixture of the cement and the I-grade fly ash) is as follows: 0.90 percent to 1, wherein the weight ratio of the retarder to the cementing material (the mixture of cement and I-grade fly ash) is as follows: 0.07 percent to 1 percent. The grouting material prepared by adopting the proportion can meet two indexes of high strength, fast hardness and good fluidity aiming at the tunnel grouting material of the weak and loose broken stratum.
The performance of the slurry is particularly important for the tunnel grouting project. Aiming at the grouting requirement of the tunnel with large deformation of soft rock, the grouting method is tightly combined with the tunnel construction process, and the time (about 4 hours) from anchor rod construction (including grouting) to the next circulating blasting excavation process is fully considered, so that the novel grouting slurry needs to provide high strength and anchoring force (the laboratory index is that the compressive strength is more than 10MPa) in 4 hours, and thus, in the construction disturbance (especially blasting vibration) process, surrounding rocks around the tunnel can form a reinforcing ring to form a bearing arch; meanwhile, the anchoring force of the anchor rod can play a role, a pulling force is given to the steel frame and the sprayed concrete, the primary support is prevented from being settled and deformed under the action of blasting vibration and being separated from the surrounding rock, and a space for the surrounding rock to be loosened and pulled and deformed is given. Furthermore, considering the time (about 40min) required for feeding, mixing, pumping and cleaning grouting equipment in the field grouting process of the tunnel, the initial setting time of the grouting slurry related to the invention is required to be 40 +/-5 min. Therefore, the two qualitative and quantitative control indexes of the grouting material are as follows:
(1) high strength and quick hardness: the 4h compressive strength is more than 10 MPa;
(2) good fluidity: the initial setting time is 40 plus or minus 5 min.
Based on the two basic indexes, the invention finely researches and analyzes the basic performances of various cements (portland cement, common portland cement, fly ash portland cement, composite portland cement, sulphoaluminate cement, rapid hardening sulphoaluminate cement, ferro-aluminate cement, expansion cement and the like), admixtures (fly ash, alunite), aggregates (quartz sand, river sand, sea sand and aeolian sand) and additives (water reducing agent, early strength agent, retarder and expanding agent) at the beginning of the test, and performs up to 500 groups of basic tests on various cements through single-factor tests, orthogonal tests and expansibility tests, thereby finally optimizing, screening and preparing the grouting material and the mixing ratio which are simple, easy to operate, high in strength, rapid hardening, low in price, good in permeability and high in calculus rate. Finally, the method is practically applied through field tests in outdoor slopes and tunnels, has extremely remarkable effect, effectively controls large deformation disasters such as cracking and peeling of soft rock tunnel concrete, steel frame distortion and breakage, primary support limit invasion and the like, can be widely popularized and applied to other tunnel engineering, slope engineering, hydraulic engineering and foundation pit engineering, and has great popularization value.
The above description is further intended to illustrate the process of the present invention in detail with reference to specific examples, which should not be construed as limiting the practice of the process of the present invention. For a person skilled in the art to which the invention pertains, several equivalent alternatives or obvious modifications, all of which have the same properties or uses, without departing from the inventive concept, should be considered as falling within the scope of the patent protection of the invention, as determined by the claims filed.
Claims (2)
1. A high-strength quick-hardening anchor rod grouting material is characterized by comprising cement, water, fly ash, quartz sand, a water reducing agent and a retarder, wherein the weight ratio of the fly ash to the cement is (0.25-0.5): 1, the weight ratio of the water to the total mass of the cement and the fly ash is (0.4-0.42): 1, the weight ratio of the quartz sand to the total mass of the cement and the fly ash is (0.50-0.8): 1, the weight ratio of the water reducing agent to the total mass of the cement and the fly ash is (0.5-0.90%): 1, and the weight ratio of the retarder to the total mass of the cement and the fly ash is (0.04-0.08%): 1;
the particle size of the quartz sand is 35-70 meshes;
the retarder is citric acid;
the water reducing agent is a polycarboxylic acid liquid water reducing agent;
the cement is rapid hardening sulphoaluminate 425 cement;
the fly ash is I-grade fly ash;
the 4h compressive strength of the grouting material is more than 10 MPa; the initial setting time is 40 plus or minus 5 min;
the grouting material can not only permeate into the joint cracks of the loose and broken stratum, but also has high calculus rate and large friction coefficient, and can effectively play a role in reinforcing surrounding rocks and providing uplift resistance.
2. A high-strength quick-hardening anchor rod grouting material as claimed in claim 1, wherein the weight ratio of fly ash to cement is 0.5: 1.
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| CN109578021B (en) * | 2018-11-29 | 2021-04-06 | 长安大学 | Grouting reinforcement method for soft rock tunnel |
| CN111848028A (en) * | 2020-07-01 | 2020-10-30 | 太原理工大学 | Composite grouting material for weak fractured rock mass and preparation method thereof |
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