CN107512862B - Tackifier special for shield synchronous grouting material - Google Patents
Tackifier special for shield synchronous grouting material Download PDFInfo
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- CN107512862B CN107512862B CN201710687329.3A CN201710687329A CN107512862B CN 107512862 B CN107512862 B CN 107512862B CN 201710687329 A CN201710687329 A CN 201710687329A CN 107512862 B CN107512862 B CN 107512862B
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- synchronous grouting
- tackifier
- grouting material
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/44—Thickening, gelling or viscosity increasing agents
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a special tackifier for a shield synchronous grouting material, which is characterized by comprising the following components in percentage by mass: 85-95% of silica fume; 2-8% of polyacrylamide; 2-10% of seawater slurry regulator, and the mass percentage of the components is 100%. The tackifier disclosed by the invention can greatly improve the water dispersibility resistance of the shield synchronous grouting material, reduce the bleeding rate and the layering degree of the material, prevent the pipe piece from being high in floating capacity, improve the stability of the material, improve the comprehensive performance of the material, enable the 28d water-land strength ratio of the synchronous grouting liquid to reach more than 90%, and can be well adapted to the conditions of a high-pressure water-rich stratum.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a special tackifier for a shield synchronous grouting material.
Background
The synchronous grouting technology is a construction mode that during shield tunneling construction, when a shield is pushed to a shield tail to be separated from a segment, an overbreak gap appears on the back surface of the segment, so that a destructive influence on an adjacent structure is caused by formation deformation, and after the shield tail is separated, consolidation grout is filled on the back surface of the segment. The main purposes of synchronous grouting are: (1) filling the shield tail building gap in time, supporting the rock mass around the pipe piece, and effectively controlling the ground surface settlement; (2) the early stability of the segment lining and the sealing performance of the gap are ensured, and the segment is prevented from floating upwards; (3) as a first waterproof line for lining, the waterproof lining provides a long-term, homogeneous and stable waterproof function; (4) the reinforced layer of the tunnel lining structure has bearing capacity.
In modern large-scale river-crossing sea tunnel construction, common synchronous grouting materials cannot meet the synchronous grouting requirement under the condition of miscellaneous geology. Aiming at the problems existing in the performance of the common grouting material, numerous scholars research from different angles and try to solve the problems of poor water dispersibility, poor impermeability and the like of the grouting material. For example, methods such as optimizing the design of the mixing ratio of synchronous grouting materials, adding mineral admixtures, organic polymers and fibers and the like have achieved certain results to different degrees, but still have many problems. For example, domestic scholars improve the water dispersion resistance of the synchronous grouting material by adding the polymer, but the early stage and final strength of the grouting material are reduced.
For a water-rich stratum with a large permeability coefficient, the traditional synchronous grouting material is diluted by underground water after being injected during shield construction, the expected synchronous grouting effect cannot be achieved, and particularly under the condition of high water pressure, the synchronous grouting material is easier to dilute, so that the material structure is damaged.
Therefore, it is necessary to develop a special tackifier for a shield tail synchronous grouting material of a high-pressure water-rich stratum to ensure that the grouting material not only meets the working performance, but also has high water-resistant dispersibility and high strength in a high-pressure water-rich stratum environment, so that the stability of a shield segment in the tunnel construction process is ensured.
The Chinese invention patent with the patent number ZL201410036474.1 discloses a seawater slurry regulator which is used for regulating engineering slurry required by construction of a cast-in-situ bored pile in a marine environment and has excellent performances of seawater resistance, high viscosity, high suspension and high colloid rate. In the prior art, the seawater slurry regulator is only applied to engineering slurry for constructing the cast-in-situ bored pile in the marine environment, and is not applied to other environments.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide a special tackifier which ensures that a grouting material not only meets the working performance, but also has high water-resistant dispersibility and high strength in a high-pressure water-rich stratum environment.
The technical scheme of the invention is as follows: the special tackifier for the shield synchronous grouting material is characterized by comprising the following components in percentage by mass:
85-95% of silica fume; 2-8% of polyacrylamide; 2-10% of seawater slurry regulator,
the mass percentage of the components is 100 percent.
Preferably, the paint comprises the following components in percentage by mass:
92-95% of silica fume; 2-5% of polyacrylamide; 3-6% of seawater mud regulator
The mass percentage of the components is 100 percent.
Further, the silica fume specific surface area is 15000-2(g), the granularity is more than 3000 meshes. The silica fume is amorphous spherical particles, the surface is smooth, the specific surface area is large, the activity is high, and the tiny spherical particles play a role in lubricating materials.
Further, the molecular weight of the polyacrylamide is 600-1200 ten thousand.
Further, the seawater slurry conditioner is disclosed in patent number ZL201410036474.1 and is an existing product of engineering design research institute of Harbour, Zhongji Wuhan, China, and the seawater slurry conditioner is a seawater slurry conditioner with a molecular weight of 2 × 106～1.5×107The high molecular weight polymer of (1).
The invention has the beneficial effects that:
1. the tackifier disclosed by the invention can greatly improve the water dispersibility resistance of the shield synchronous grouting material, reduce the bleeding rate and the layering degree of the material, prevent the pipe piece from being high in floating capacity, improve the stability of the material, improve the comprehensive performance of the material, enable the 28d water-land strength ratio of the synchronous grouting liquid to reach more than 90%, and can be well adapted to the conditions of a high-pressure water-rich stratum.
2. The polyacrylamide and seawater slurry regulator is a super-polymer, and side chains with charges in molecules are reversely wound on a main chain to form a very regular spiral copolymer network structure, and the network structures enable the molecules to have very strong rigidity, so that molecular chains of the biological glue in an aqueous solution have good extensibility, the mobility of the aqueous solution can be well controlled, and the biological glue has good tackifying performance. Effectively resist the dilution and dispersion effects of the high-pressure water-rich condition on the synchronous grouting material.
3. The silica fume is amorphous spherical particles, the surface is smooth, the specific surface area is large, the activity is high, the tiny spherical particles can play a lubricating role, and the silica fume has extremely strong cementing power. The silica fume not only has a certain tackifying function, but also has an obvious effect on improving the compressive strength of the synchronous grouting material.
Detailed Description
The present invention will be described in further detail with reference to specific examples, and the formulations of specific examples 1 to 8 are shown in Table 1.
TABLE 1 formulations of examples 1-8
Example 1
As shown in table 1, the tackifier for the synchronous grouting material comprises the following components in parts by weight:
92% of silica fume; 6% of polyacrylamide; 2% of seawater mud regulator;
wherein: the specific surface area of the silica fume is 15000-2Particle size of more than 3000 meshes, polyacrylamide molecular weight of 600-1200 ten thousand, seawater mud regulator disclosed in patent No. ZL201410036474.1, molecular weight of 2 × 106～1.5×107。
Example 2
As shown in table 1, the tackifier for the synchronous grouting material comprises the following components in parts by weight:
92% of silica fume; 4% of polyacrylamide; 4% of seawater mud regulator;
wherein: the specific surface area of the silica fume is 15000-2Particle size of more than 3000 meshes, polyacrylamide molecular weight of 600-1200 ten thousand, seawater mud regulator disclosed in patent No. ZL201410036474.1, molecular weight of 2 × 106～1.5×107。
Example 3
As shown in table 1, the tackifier for the synchronous grouting material comprises the following components in parts by weight:
92% of silica fume; 2% of polyacrylamide; 6% of seawater mud regulator;
wherein: the specific surface area of the silica fume is 15000-2Particle size of over 3000 meshes, polyacrylamide molecular weight of 600-1200 ten thousand, seawater mud regulationThe agent is seawater mud regulator disclosed in patent number ZL201410036474.1, and has molecular weight of 2 × 106～1.5×107。
Example 4
As shown in table 1, the tackifier for the synchronous grouting material comprises the following components in parts by weight:
92% of silica fume; 2% of polyacrylamide; 6% of seawater mud regulator;
wherein: the specific surface area of the silica fume is 15000-2Particle size of more than 3000 meshes, polyacrylamide molecular weight of 600-1200 ten thousand, seawater mud regulator disclosed in patent No. ZL201410036474.1, molecular weight of 2 × 106～1.5×107。
Example 5
As shown in table 1, the tackifier for the synchronous grouting material comprises the following components in parts by weight:
90% of silica fume; 4% of polyacrylamide; 6% of seawater mud regulator;
wherein: the specific surface area of the silica fume is 15000-2Particle size of more than 3000 meshes, polyacrylamide molecular weight of 600-1200 ten thousand, seawater mud regulator disclosed in patent No. ZL201410036474.1, molecular weight of 2 × 106～1.5×107。
Example 6
As shown in table 1, the tackifier for the synchronous grouting material comprises the following components in parts by weight:
90% of silica fume; 5% of polyacrylamide; 5% of seawater mud regulator;
wherein: the specific surface area of the silica fume is 15000-2Particle size of more than 3000 meshes, polyacrylamide molecular weight of 600-1200 ten thousand, seawater mud regulator disclosed in patent No. ZL201410036474.1, molecular weight of 2 × 106～1.5×107。
Example 7
As shown in table 1, the tackifier for the synchronous grouting material comprises the following components in parts by weight:
85% of silica fume; 5% of polyacrylamide; 10% of seawater mud regulator;
wherein: the specific surface area of the silica fume is 15000-2Particle size of more than 3000 meshes, polyacrylamide molecular weight of 600-1200 ten thousand, seawater mud regulator disclosed in patent No. ZL201410036474.1, molecular weight of 2 × 106～1.5×107。
Example 8
As shown in table 1, the tackifier for the synchronous grouting material comprises the following components in parts by weight:
85% of silica fume; 8% of polyacrylamide; 7% of seawater mud regulator;
wherein: the specific surface area of the silica fume is 15000-2Particle size of more than 3000 meshes, polyacrylamide molecular weight of 600-1200 ten thousand, seawater mud regulator disclosed in patent No. ZL201410036474.1, molecular weight of 2 × 106～1.5×107。
Uniformly mixing the silica fume, the polyacrylamide and the seawater slurry regulator to obtain the tackifier for the synchronous grouting material.
The tackifier of the synchronous grouting material prepared in the embodiment is subjected to performance test
The synchronous grouting material comprises the following components in percentage by weight:
aggregate: sieving river sand by a sieve of 2 mm;
filling: the dosage of the cement (ordinary Portland cement 42.5) is 120kg/m3；
The using amount of the fly ash (II level) is 360kg/m3；
The water-cement ratio (w/c) is 0.7;
the mixing amount of the tackifier is 2.2 percent of the dosage of the adhesive material (cement and fly ash);
stirring mode: firstly, dry-stirring the tackifier powder in a No. 1 stirrer for 3-5 min to be uniformly mixed, then adding water required by the material into a No. 2 stirrer to keep the No. 2 stirrer at a high rotating speed, slowly adding the uniformly-stirred tackifier into the No. 2 stirrer to be stirred for 5-10 min to uniformly disperse the tackifier in water, finally gradually adding the weighed cement, fly ash and sand into the stirrer 2, and stopping stirring after uniform stirring.
The molding method comprises the following steps: putting a triple mortar test model of 70.7mm multiplied by 70.7mm into a water pool, enabling the water surface to be 20cm higher than the mold, then injecting the mortar into the mold by using a guide pipe, taking the mold out of the water pool for vibration molding after the mortar overflows from the mold, then carrying out standard maintenance to a specified age for carrying out a compressive strength test, wherein the strength tested by the method is the underwater strength of the mortar, and the strength tested by the method for testing the compressive strength according to the compressive strength method in JGJ70-90 building mortar basic performance test method is the land strength of the mortar.
Slurry water dispersion resistance test: refer to DL/T5177-2000, Experimental protocols for UnSegregation concrete underwater. And (3) injecting 300ml of fresh slurry into 1000ml of purified water in a measuring cylinder, standing for 5min, and measuring the pH value of the upper layer of clear water.
Comparative example
The tackifier for the synchronous grouting material comprises the following components in parts by weight:
100 percent of bentonite.
The synchronous grouting material comprises the following components in percentage by weight:
aggregate: sieving river sand by a sieve of 2 mm;
filling: the dosage of the cement (ordinary Portland cement 42.5) is 120kg/m3；
The using amount of the fly ash (II level) is 360kg/m3；
The water-cement ratio (w/c) is 0.7;
the mixing amount of the tackifier is 8.3 percent of the using amount of the adhesive material;
the stirring mode is the same as the performance test;
the molding method is the same as the performance test.
The results of the performance tests of the examples and comparative examples are shown in table 2 below.
As shown in table 2, the test results show that: the mixing amount of the silica fume is ensured to be unchanged, the proportion of the polyacrylamide to the seawater mud regulator is changed, the 3d, 7d and 28d compressive strengths of the seawater mud regulator are reduced along with the improvement of the proportion of the seawater mud regulator, and the land-water strength ratio of the seawater mud regulator is increased to a certain extent. Compared with bentonite, the material has obvious advantages and higher land-water strength ratio.
TABLE 2 test results of compressive strength and Water permeability coefficient
The stirred mortar was subjected to the working property (fluidity, consistency, bleeding rate, degree of stratification, setting time) and the water dispersibility (pH value, 28d land strength and 28d land strength ratio) test, and the test results are shown in table 3 below.
TABLE 3 mortar workability and Water Dispersion test results
As shown in table 3, the test results show that: the synchronous grouting material doped with the tackifier, the water reducing agent and the sodium gluconate has excellent performance indexes, has excellent comprehensive performances of high water-resistant dispersibility, high plastic retention and the like, and meets the performance requirements of the synchronous grouting material for the high-pressure water-rich stratum.
Claims (2)
1. The special tackifier for the shield synchronous grouting material is characterized by comprising the following components in percentage by mass:
92-95% of silica fume; 2-5% of polyacrylamide; 3-6% of a seawater slurry regulator; the mass percentage of the components is 100 percent, and the specific surface area of the silica fume is 15000-2The particle size of the seawater mud regulator is more than 3000 meshes, the seawater mud regulator is disclosed in the patent number ZL201410036474.1, and the molecular weight of the seawater mud regulator is 2 × 106-1.5×107The high molecular weight polymer of (1).
2. The special tackifier for shield synchronous grouting material according to claim 1, wherein the molecular weight of polyacrylamide is 600-1200 ten thousand.
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| CN108409227A (en) * | 2018-02-02 | 2018-08-17 | 中交第二航务工程局有限公司 | Slurry, which is abandoned, using slurry shield abandons sand co-formulated Testing of Grouting Material Behind Segments method |
| CN110498633B (en) * | 2019-08-14 | 2021-09-10 | 中交武汉港湾工程设计研究院有限公司 | Composite additive for shield synchronous grouting material |
| CN114573278B (en) * | 2022-03-23 | 2023-01-24 | 北京华阳众信建材有限公司 | Shield grouting material and preparation method thereof |
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| JP4166537B2 (en) * | 2001-11-08 | 2008-10-15 | 花王株式会社 | Thickener |
| CN101239794B (en) * | 2007-12-28 | 2010-12-15 | 河海大学 | Tackifier of cement-base material and its preparation method and application |
| CN103964796B (en) * | 2013-01-24 | 2016-08-10 | 北京交通大学 | A kind of shield tunnel simultaneous grouting slurry being applicable to water-rich sand layer |
| CN103773336B (en) * | 2014-01-26 | 2016-08-17 | 中交武汉港湾工程设计研究院有限公司 | A kind of seawater mud regulator |
| CN205558912U (en) * | 2016-03-10 | 2016-09-07 | 广州市盾建地下工程有限公司 | Shield constructs machine and shield constructs quick -witted synchronous slip casting pipe |
| CN106946522B (en) * | 2017-03-08 | 2020-04-07 | 北京艺高世纪科技股份有限公司 | Shield synchronous grouting construction material |
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