CN112279592A - Water-dispersion-resistant synchronous grouting material for water-rich stratum - Google Patents
Water-dispersion-resistant synchronous grouting material for water-rich stratum Download PDFInfo
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- CN112279592A CN112279592A CN202011204229.9A CN202011204229A CN112279592A CN 112279592 A CN112279592 A CN 112279592A CN 202011204229 A CN202011204229 A CN 202011204229A CN 112279592 A CN112279592 A CN 112279592A
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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
- C04B28/04—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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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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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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a water-dispersion-resistant synchronous grouting material for a water-rich stratum, which is prepared from portland cement, sand, nano silicon modified lithium magnesium silicate, sodium polyacrylate, guar gum ether and a high-performance water reducing agent. The invention has the advantages of good water dispersion resistance, low bleeding rate, high early strength and high calculus rate, can resist dilution and washout of underground water and can be normally condensed when being used for synchronous grouting construction of a water-rich stratum, so as to ensure normal operation of shield tunneling construction; the grouting filling rate is high, the filling is sufficient after the grouting is finished, and the problems of water leakage and surface collapse caused by the filling are avoided.
Description
Technical Field
The invention relates to a grouting material, in particular to a water-dispersion-resistant synchronous grouting material for a water-rich stratum.
Background
The synchronous grouting material is a gap with a certain thickness formed in the subway shield construction or shield tunnel construction and other engineering construction processes, and the gap needs to be filled with the synchronous grouting material, so that the soil layer loss is compensated, and the phenomena of preventing the ground surface from settling, preventing the displacement from increasing the disturbance to the surrounding stratum and the like are achieved.
The traditional synchronous grouting material has the problems of easy water scouring, dilution and the like, and has the problem of poor water dispersion resistance when being applied to a water-rich stratum, so that the grouting amount is greatly increased, the grouting filling rate is low, and the problems of water leakage and surface subsidence caused by insufficient filling after grouting are serious, thereby directly influencing the engineering quality.
Aiming at the defects of the existing synchronous grouting material, the invention aims to create the water-dispersion-resistant synchronous grouting material for the water-rich stratum through the optimized design of the material, so that the water-dispersion-resistant synchronous grouting material is better suitable for the water-rich stratum and has better applicability. Through continuous research and design, the grouting material with practical value is created.
Disclosure of Invention
The invention mainly aims to improve the grouting filling rate of the grouting material. The technical scheme mainly comprises the following steps:
the invention provides a water-resistant dispersion type synchronous grouting material for a water-rich stratum, which comprises the following components in percentage by mass: 33.2 to 50.1 percent of Portland cement, 48.7 to 66.5 percent of sand, 0.3 to 2 percent of nano-silicon modified magnesium lithium silicate, 0.01 to 0.6 percent of sodium polyacrylate, 0.1 to 0.5 percent of guar gum ether and 0.03 to 0.1 percent of high-performance water reducing agent;
the silicate cement is a cementing material of a grouting material system, plays a role of a cementing agent and is a key for generating the strength of the grouting material, but the silicate cement has certain chemical shrinkage, the higher the doping amount is, the lower the shrinkage is, tests show that the silicate cement can provide the strength required by the grouting material when the proportion is 33.2-50.1%, the generated chemical shrinkage is smaller, and the calculus rate of the grouting material in the doping amount range meets the performance requirement of a product; the sand is used as the aggregate of the grouting material system, plays a role in supporting and constructing, the strength of the grouting material can be improved by a proper amount of sand, the shrinkage of the grouting material system is inhibited and reduced, the excessive sand can cause the delamination, bleeding and poor workability of the grouting material, tests show that the sand has an effect of improving the strength of the grouting material within the range of 48.7-66.5%, and the grouting material has good workability at the moment, so that the problems of delamination and bleeding can be overcome; the nano silicon modified magnesium lithium silicate can improve the cohesiveness and stability of a shield grouting material and reduce the bleeding rate and the layering degree of the grouting material, but the consistency of the grouting material is obviously reduced after the doping amount of the nano silicon modified magnesium lithium silicate is too high, and the constructability does not meet the requirements, and tests show that the nano silicon modified magnesium lithium silicate can reduce the bleeding rate and the layering degree of the grouting material within the range of 0.3-2%, and simultaneously the consistency of the grouting material is not obviously reduced, thereby being beneficial to the constructability of the grouting material; the sodium polyacrylate can improve the overall stability and the water dispersion resistance of slurry, but excessive sodium polyacrylate can cause the consistency of the grouting material to be reduced and the setting time to be greatly prolonged, and tests show that the sodium polyacrylate can reduce the bleeding rate and the layering degree of the grouting material within the range of 0.01-0.6 percent, improve the water dispersion resistance of the grouting material, simultaneously have no obvious reduction on the consistency of the grouting material and greatly prolong the setting time of the grouting material; guar ether has good flocculation effect, the scouring resistance of the grouting material is strong in the water-rich stratum environment, the coagulation performance is high, the water-dispersion resistance of the grouting material under the water-rich stratum is improved, but the excessive guar ether can cause the strength reduction of the grouting material, tests show that the guar ether has a certain improvement effect on the water-dispersion resistance of the grouting material under the water-rich stratum within the range of 0.1-0.5%, and meanwhile, the compression strength is not obviously reduced; the high-performance water reducing agent has certain functions of reducing and slump retaining, can improve the consistency of a grouting material, and improve the workability and the injectability of the grouting material, and excessive water reducing agent can prolong the setting time of the grouting material and cause the bleeding and the layering of the grouting material.
Preferably, the composition comprises the following components in percentage by mass: 35.2 to 49.1 percent of Portland cement, 50.1 to 62 percent of sand, 0.5 to 2 percent of nano silicon modified magnesium lithium silicate, 0.03 to 0.5 percent of sodium polyacrylate, 0.1 to 0.5 percent of guar gum ether and 0.03 to 0.1 percent of high-performance water reducing agent.
Preferably, the composition comprises the following components in percentage by mass: 35.2 to 49.1 percent of Portland cement, 50.1 to 62 percent of sand, 0.3 to 2 percent of nano silicon modified magnesium lithium silicate, 0.03 to 0.5 percent of sodium polyacrylate, 0.3 to 0.5 percent of guar gum ether and 0.03 to 0.1 percent of high-performance water reducing agent.
Preferably, the portland cement is early-strength 42.5-grade portland cement or early-strength 52.5-grade portland cement, and the early-strength 42.5-grade portland cement or the early-strength 52.5-grade portland cement is selected to be more favorable for the generation of early strength of the grouting material, so that the early supporting effect of the grouting material on the surrounding soil mass and the stabilizing effect on the duct piece are ensured.
Preferably, the sand is river sand, the fineness modulus is 2.5-3.0, the mud content is less than 1.0%, the fineness of the river sand in the fineness modulus range is moderate, the gradation is reasonable, and compared with the sand with other fineness moduli, the sand has small demand on a cementing material and is not suitable for layering when the same consistency is achieved.
Preferably, the nano silicon modified lithium magnesium silicate is natural nano silicon modified lithium magnesium silicate mineral gel, the thixotropic value of the gel is more than or equal to 8%, and if the thixotropic value is less than 8%, the improvement effect of the nano silicon modified lithium magnesium silicate on the cohesiveness and stability of the grouting material under a high doping amount is not obvious, but the consistency of the grouting material is reduced.
Preferably, the molecular weight of the sodium polyacrylate is more than or equal to 3000 ten thousand, and if the sodium polyacrylate with the molecular weight of less than 3000 ten thousand is selected, the water dispersibility of the grouting material can still be improved insignificantly by the sodium polyacrylate under a higher mixing amount, but the setting time of the grouting material can be prolonged obviously.
Preferably, the guar gum ether is amphoteric guar gum ether with a molecular weight of more than or equal to 25 ten thousand, and if the guar gum ether with a molecular weight of less than 25 ten thousand is selected, the guar gum ether still can not obviously improve the water dispersibility resistance of the grouting material under the water-rich stratum under a high doping amount, but can obviously reduce the strength of the grouting material.
Preferably, the high-performance water reducing agent is polycarboxylic acid high-performance water reducing agent powder.
The water-dispersion-resistant synchronous grouting material for the water-rich stratum at least has the following advantages:
1. the nano silicon modified magnesium lithium silicate has excellent dispersion characteristics, is extremely easy to uniformly disperse in slurry of a grouting material, can improve the cohesiveness and stability of a shield grouting material by an association network structure formed after the nano silicon modified magnesium lithium silicate is dispersed in water, reduces the bleeding rate and the layering degree of the grouting material, has excellent thixotropy at the same time, ensures that the grouting material has good cohesiveness, stability and integrity in a static state, improves the water dilution and dispersion resistance of the grouting material after being soaked in water in a water-rich stratum, has a certain lubricating effect under proper grouting pressure, reduces the direct friction force between cement particles and sand grains, and improves the groutability of the grouting material; the thixotropic value of the invention is controlled to be more than or equal to 8 percent, and the effect is more obvious;
2. the sodium polyacrylate has good coagulation (chelation) effect on slurry suspension of the grouting material, and particularly the sodium polyacrylate with the molecular weight of more than or equal to 3000 ten thousand improves the overall stability of the slurry, so that the grouting material can still keep an overall coagulation state when being washed by certain water pressure, and the water-resistant dispersibility of the grouting material in a water-rich stratum and the good calculus rate of the water-rich stratum are ensured;
3. guar gum ether with the molecular weight of more than or equal to 25 ten thousand is selected, so that the flocculant has good flocculation effect, the scouring resistance of the grouting material in the water-rich stratum environment is strong, the coagulation performance is high, and the water dispersion resistance of the grouting material slurry in the water-rich stratum is improved; the high-performance water reducing agent has high water reducing rate and good plasticity retention property, and can improve the workability and the injectability of grouting materials.
4. The grouting material provided by the invention has the advantages of good water dispersion resistance, low bleeding rate, high early strength and high calculus rate, can resist the dispersion of underground water of a water-rich stratum when being used for shield synchronous grouting construction of the water-rich stratum, can be well condensed, and is convenient for construction operation.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
The case of the commercial materials of the present invention is as follows:
42.5 grade portland cement available from beijing kumquat cement co;
river sand, purchased from santai an mountain;
nano silicon modified lithium magnesium silicate, purchased from high-new materials, inc;
sodium polyacrylate, purchased from Jiangsu lanyu bioengineering Co., Ltd;
guar ethers, available from zhengzhou pur chemical products ltd;
the high-performance water reducing agent is CABR-J1, and is purchased from China institute of architectural science.
Example 1
2000g of the water-dispersion-resistant synchronous grouting material suitable for the water-rich stratum in the embodiment is prepared from the following raw materials in parts by mass: 664g of 42.5-grade ordinary portland cement meeting the standard requirements of general portland cement, 664g of standard portland cement meeting the standard requirements of construction sand, 2.5-3.0 fineness modulus, 1327g of river sand with mud content of less than 1.0%, 7g of nano-silicon modified lithium magnesium silicate, 0.27g of sodium polyacrylate, 1g of guar gum ether and 0.73g of a high-performance water reducing agent;
after 2000g of each raw material was mixed, the mixture was put into a mortar mixer and stirred for 120 seconds to uniformly mix the raw materials. Then 1600g of water is added and stirred for 120 seconds to prepare a finished product material L1。
Example 2
2000g of the water-dispersion-resistant synchronous grouting material suitable for the water-rich stratum in the embodiment is prepared from the following raw materials in parts by mass: 664g of 42.5-grade ordinary portland cement meeting the standard requirements of general portland cement, 664g of standard portland cement meeting the standard requirements of construction sand, 2.5-3.0 fineness modulus, 1327g of river sand with mud content of less than 1.0%, 6.67g of nano-silicon modified lithium magnesium silicate, 0.53g of sodium polyacrylate, 1g of guar gum ether and 0.8g of high-performance water reducing agent;
after mixing the above raw materials in total of 2000g, the mixture was put into a mortar mixer and stirred for 120 seconds to uniformly mix the raw materials. Then 1600g of water is added and stirred for 120 seconds to prepare a finished product material L2。
Example 3
2000g of the water-dispersion-resistant synchronous grouting material suitable for the water-rich stratum in the embodiment is prepared from the following raw materials in parts by mass: 994g of 42.5-grade ordinary portland cement meeting the standard requirements of general portland cement, namely 993g of sand meeting the standard requirements of sand for construction, 2.5-3.0 of fineness modulus, 993g of river sand with mud content of less than 1.0%, 9.6g of nano-silicon modified magnesium lithium silicate, 0.4g of sodium polyacrylate, 2g of guar gum ether and 1g of high-performance water reducing agent;
after mixing the above raw materials in total of 2000g, the mixture was put into a mortar mixer and stirred for 120 seconds to uniformly mix the raw materials. Then 1500g of water are added and stirred for 120 seconds to obtain a finished product L3。
Example 4
2000g of the water-dispersion-resistant synchronous grouting material suitable for the water-rich stratum in the embodiment is prepared from the following raw materials in parts by mass: 979g of 42.5-grade ordinary portland cement meeting the standard requirements of general portland cement, 2.5-3.0 of fineness modulus, 1000g of river sand with mud content of less than 1.0%, 18.42g of nano-silicon modified lithium magnesium silicate, 0.58g of sodium polyacrylate, 1g of guar gum ether and 1g of high-performance water reducing agent;
after mixing the above raw materials in total of 2000g, the mixture was put into a mortar mixer and stirred for 120 seconds to uniformly mix the raw materials. Then 1500g of water are added and stirred for 120 seconds to obtain a finished product L4。
Example 5
2000g of the water-dispersion-resistant synchronous grouting material suitable for the water-rich stratum in the embodiment is prepared from the following raw materials in parts by mass: 978g of 42.5-grade ordinary portland cement meeting the standard requirements of general portland cement, 978g of river sand meeting the standard requirements of construction sand, 2.5-3.0 of fineness modulus, 1.0% of mud content, 39g of nano-silicon modified magnesium lithium silicate, 1.17g of sodium polyacrylate, 2g of guar gum ether and 1.83g of high-performance water reducing agent;
after mixing the above raw materials in total of 2000g, the mixture was put into a mortar mixer and stirred for 120 seconds to uniformly mix the raw materials. 1400g of water was added thereto and the mixture was stirred for 120 seconds to obtain a finished product L5。
Example 6
2000g of the water-dispersion-resistant synchronous grouting material suitable for the water-rich stratum in the embodiment is prepared from the following raw materials in parts by mass: 974g of 42.5-grade ordinary portland cement meeting the standard requirements of general portland cement, 974g of river sand meeting the standard requirements of construction sand, 2.5-3.0 of fineness modulus, 1.0% of mud content, 38.83g of nano-silicon modified magnesium lithium silicate, 1.17g of sodium polyacrylate, 10g of guar gum ether and 2g of high-performance water reducing agent;
after mixing the above raw materials in total of 2000g, the mixture was put into a mortar mixer and stirred for 120 seconds to uniformly mix the raw materials. 1400g of water was added thereto and the mixture was stirred for 120 seconds to obtain a finished product L6。
Comparative example 1
2000g of the water-dispersion-resistant synchronous grouting material suitable for the water-rich stratum in the embodiment is prepared from the following raw materials in parts by mass: 560g of 42.5-grade ordinary portland cement, 1333g of sand and 107g of sodium-grade bentonite;
after 2000g of each raw material of the grouting material of this comparative example was mixed, the mixture was put into a mortar mixer and stirred for 120 seconds to uniformly mix the raw materials. Then 1600g of water is added and stirred for 120 seconds to prepare a finished product material L0。
And (3) performance testing:
testing the molded finished grouting material L0～L6The test methods of the consistency, the 2-day compressive strength, the 28-day compressive strength, the bleeding rate, the land-water strength ratio and the calculus rate are carried out by referring to the technical specification of the application of the shield tunnel synchronous grouting material (T/CECS 563-2018) of the current standard, and the detailed test results are shown in Table 1:
TABLE 1 finished grouting materials L0-L6Performance test data of
Grouting material (L) commonly used in the invention and engineering field0) Compared with the prior art, the high-strength early-stage concrete has the advantages of high early-stage strength, low bleeding rate, good water dispersion resistance (high land-water strength ratio), good filling performance (high calculus rate) and the like.
By optimizing the components of the material, the grouting material has the advantages of good water dispersion resistance, low bleeding rate, high early strength and high calculus rate, can resist the dispersion of underground water of a water-rich stratum when used for shield synchronous grouting construction of the water-rich stratum, can well condense, is convenient for construction operation, and ensures the engineering quality.
Specifically, the used nano silicon modified magnesium lithium silicate has excellent characteristics of dispersion, suspension, thickening, thixotropy and the like, can improve cohesiveness, stability and thixotropy of the shield grouting material, reduce bleeding rate and layering degree of the grouting material, improve integrity, stability and water dispersibility resistance of the shield grouting material under a water-rich stratum, and improve groutability of the shield grouting material under a dynamic water environment; the sodium polyacrylate has good coagulation (chelation) effect on slurry suspension of the grouting material, improves the overall stability of the slurry, ensures that the grouting material can still keep an overall coagulation state when being washed by water pressure, and ensures the water dispersibility resistance of the grouting material in a water-rich stratum and the good calculus rate of the water-rich stratum; the guar gum ether has good flocculation effect, the scouring resistance of the grouting material in the water-rich stratum environment is strong, the coagulation performance is high, and the water dispersion resistance of the grouting material slurry in the water-rich stratum is improved; the high-performance water reducing agent has high water reducing rate and good plasticity retention property, and can improve the workability and the injectability of grouting materials.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any person skilled in the art can make many modifications and equivalents of the above-described embodiments without departing from the scope of the present invention.
Claims (9)
1. The water-dispersion-resistant synchronous grouting material for the water-rich stratum is characterized by comprising the following components in percentage by mass: 33.2 to 50.1 percent of Portland cement, 48.7 to 66.5 percent of sand, 0.3 to 2 percent of nano silicon modified magnesium lithium silicate, 0.01 to 0.6 percent of sodium polyacrylate, 0.1 to 0.5 percent of guar gum ether and 0.03 to 0.1 percent of high-performance water reducing agent.
2. The water-resistant dispersion type synchronous grouting material for the water-rich stratum according to claim 1, which is characterized by comprising the following components in percentage by mass: 35.2 to 49.1 percent of Portland cement, 50.1 to 62 percent of sand, 0.5 to 2 percent of nano silicon modified magnesium lithium silicate, 0.03 to 0.5 percent of sodium polyacrylate, 0.1 to 0.5 percent of guar gum ether and 0.03 to 0.1 percent of high-performance water reducing agent.
3. The water-resistant dispersion type synchronous grouting material for the water-rich stratum according to claim 1, which is characterized by comprising the following components in percentage by mass: 35.2 to 49.1 percent of Portland cement, 50.1 to 62 percent of sand, 0.3 to 2 percent of nano silicon modified magnesium lithium silicate, 0.03 to 0.5 percent of sodium polyacrylate, 0.3 to 0.5 percent of guar gum ether and 0.03 to 0.1 percent of high-performance water reducing agent.
4. The water-resistant dispersion type synchronous grouting material for the water-rich stratum according to any one of claims 1 to 3, characterized in that: the portland cement is early-strength 42.5-grade portland cement or early-strength 52.5-grade portland cement.
5. The water-resistant dispersion type synchronous grouting material for the water-rich stratum according to any one of claims 1 to 3, characterized in that: the sand is river sand, the fineness modulus is 2.5-3.0, and the mud content is less than 1.0%.
6. The water-resistant dispersion type synchronous grouting material for the water-rich stratum according to any one of claims 1 to 3, characterized in that: the nano silicon modified lithium magnesium silicate is natural nano silicon modified lithium magnesium silicate mineral gel, and the thixotropic value of the nano silicon modified lithium magnesium silicate mineral gel is more than or equal to 8 percent.
7. The water-resistant dispersion type synchronous grouting material for the water-rich stratum according to any one of claims 1 to 3, characterized in that: the molecular weight of the sodium polyacrylate is more than or equal to 3000 ten thousand.
8. The water-resistant dispersion type synchronous grouting material for the water-rich stratum according to any one of claims 1 to 3, characterized in that: the guar gum ether is amphoteric guar gum ether with molecular weight more than or equal to 25 ten thousand.
9. The water-resistant dispersion type synchronous grouting material for the water-rich stratum according to any one of claims 1 to 3, characterized in that: the high-performance water reducing agent is polycarboxylic acid high-performance water reducing agent powder.
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Application publication date: 20210129 |