CN112194432B - High-dispersion high-adhesion shield grouting material - Google Patents
High-dispersion high-adhesion shield grouting material Download PDFInfo
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- CN112194432B CN112194432B CN202011077277.6A CN202011077277A CN112194432B CN 112194432 B CN112194432 B CN 112194432B CN 202011077277 A CN202011077277 A CN 202011077277A CN 112194432 B CN112194432 B CN 112194432B
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
-
- 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
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Macromonomer-Based Addition Polymer (AREA)
Abstract
The invention discloses a high-dispersion high-adhesion shield grouting material, which comprises the following components in parts by weight: 50-120 parts of cement, 250-400 parts of fly ash, 400-1200 parts of shield silt, 0.5-2 parts of shield grouting solid additive, 0.5-2 parts of thickening agent and 450-800 parts of water. According to the invention, amino modified polysiloxane is grafted to a polycarboxylic acid main chain through free radical copolymerization, and the dispersibility of the polycarboxylic acid water reducing agent is greatly improved by taking the adsorption effect of amino on the surface of cement particles and the steric hindrance effect of branched chains as main effects; meanwhile, the terminal hydroxyl contained in the side chain can improve the adsorption capacity and adsorption capacity of the polycarboxylate superplasticizer on the surface of soil and stone, improve the adhesion and dispersion of a grouting material, effectively reduce the dependence of shield grouting on high-quality sandstone resources, and have important economic and environmental benefits.
Description
Technical Field
The invention belongs to the technical field of building materials, relates to a synchronous grouting material for shield construction, and particularly relates to a high-dispersion and high-adhesion grouting material.
Background
The shield construction technology is commonly used in the construction of tunnels and subways at present, and a shield machine has a certain gap between a duct piece and the surrounding soil body in the tunneling process and needs to be filled with grouting slurry. At present, the synchronous grouting material generally comprises cement, other fillers, additives and water, and mainly plays roles of timely filling a shield tail building gap, supporting rock mass around a pipe piece and controlling ground surface settlement so as to ensure the stability of a shield tunnel.
The quality of synchronous grouting is the key for ensuring the safety and durability of the shield tunnel, and the quality of the grout directly determines the grouting effect. In order to meet the requirements of pumping and easy grouting, the shield grouting requires that the slurry has fluidity, and also requires stability, impermeability, compressive strength and proper setting time. The addition of a proper additive is an important method for improving the quality of grouting material, but the traditional high-efficiency water reducing agent can reduce the stability of the grouting material to a certain extent while increasing the fluidity of the grouting material, has segregation phenomenon and can not meet the requirements of grouting on the stability and the like. In addition, the properties of high dispersion, no bleeding, no viscosity and easy pressure pumping of shield grouting require that the sand has better performance indexes; under the current situation that high-quality sandstone resources are increasingly reduced, poor sand gradation and high mud content can cause easy bleeding of grouting, high viscosity and difficulty in pumping, and the dependence on the high-quality sandstone resources seriously restricts the quality of shield engineering.
The invention aims to prepare a shield grouting material with good dispersibility, strong stability, no segregation and no sedimentation by adopting shield silt and a self-made high-performance modified polycarboxylic acid additive, and meets the green construction requirements of resource saving and reutilization by adopting the shield silt generated by construction as a raw material.
Disclosure of Invention
The invention aims to solve the technical problems of insufficient water dispersion resistance and stability, dependence on high-quality gravel and the like of the existing subway shield grouting material, and provides a novel shield grouting material which takes shield silt as a raw gravel raw material and has the performances of high water retention, water dispersion resistance and the like on the basis of ensuring better pumping performance.
In order to achieve the purpose, the invention adopts the technical scheme that:
a shield grouting material with high dispersion and high adhesion comprises the following components in parts by weight: 50-120 parts of cement, 250-400 parts of fly ash, 400-1200 parts of shield silt, 0.5-2 parts of shield grouting solid additive, 0.5-2 parts of thickening agent and 450-800 parts of water.
In the scheme, the high-dispersion high-adhesion shield grouting material is prepared by adding the components into a mixer, mixing for 5-10 min and then discharging.
In the scheme, the cement is 42.5 ordinary portland cement.
In the scheme, the fly ash is secondary ash.
In the scheme, the fineness modulus of the shield silt is 2.4-2.8, the silt content is 5-20 wt%, and the sand content is more than 65 wt%.
In the scheme, the thickening agent is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether and xanthan gum.
In the scheme, the shield grouting solid additive is prepared by carrying out free radical polymerization reaction on isopentenol polyoxyethylene ether, unsaturated carboxylic acid and amino modified polysiloxane, and the preparation method comprises the following steps: and melting the polyether macromonomer at the temperature of 80-100 ℃, then dropwise adding unsaturated carboxylic acid, amino modified polysiloxane and initiator into the polyether macromonomer, stirring and reacting for 1-5 h, cooling, and slicing or grinding to obtain the shield grouting solid additive.
In the above embodiment, the unsaturated carboxylic acid is acrylic acid or methacrylic acid.
In the scheme, the structural formula of the amino modified polysiloxane is shown as a formula I:
wherein a is 1 to 50 and b is 1 to 50.
In the scheme, the initiator is BPO or potassium persulfate, and the dosage of the initiator is 0.2-5% of the mass of the prenyl polyoxyethylene ether.
In the scheme, the mole ratio of the prenyl alcohol polyoxyethylene ether to the unsaturated carboxylic acid to the amino modified polysiloxane is 1 (2-4.7) to 0.2-1.
Compared with the prior art, the invention has the beneficial effects that:
1) the amino modified polysiloxane modified polycarboxylate water reducer is utilized, polysiloxane side chains have larger steric hindrance effect, and the adsorption form of amino on the surface of cement particles is changed from physical adsorption to chemical adsorption, so that the polycarboxylate water reducer is prevented from being desorbed under the influence of sulfate, the water reducing rate of the polycarboxylate water reducer is greatly increased, and the polycarboxylate water reducer has better dispersibility.
2) The amino modified polysiloxane is grafted to a polycarboxylic acid main chain, and terminal hydroxyl (silanol bond) on a side chain containing siloxane groups is chemically crosslinked with silicon oxide in soil and silicon dioxide in stone, and can be adsorbed on the surface of cement particles, so that the adsorption capacity and adsorption capacity of the polycarboxylic acid water reducing agent on the surfaces of the soil, the stone and the cement can be effectively improved, the adhesion of a grouting material and a medium is greatly increased, and segregation and delamination are reduced.
3) The additive obtained by the invention can effectively reduce the negative influence of the shield silt on the doping amount of the additive, simultaneously utilizes the steric hindrance effect of the organosiloxane to reduce the tackifying effect of the shield silt on the shield grouting, can effectively reduce the dependence of the shield grouting on high-quality sandstone resources, obviously reduces the production cost of the shield grouting material, and has important economic and environmental benefits.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
In the following examples, 42.5 Portland cement was used; the fly ash is second-grade ash.
The amino-modified polysiloxane used is supplied by Tengtian chemical technology, Inc.
Example 1
A shield grouting material with high dispersion and high stability comprises the following components in parts by weight: 120 parts of cement, 250 parts of fly ash, 400 parts of shield silt, 0.5 part of shield grouting solid additive, 0.5 part of thickening agent and 450 parts of water; the preparation method comprises the steps of adding the weighed components into a mixer and mixing for 5 min.
The shield sand fineness modulus adopted in the embodiment is 2.4, the mud content is 5%, and the sand content is more than 65%; the thickening agent is hydroxypropyl methyl cellulose ether.
The preparation process of the shield grouting solid additive comprises the following steps: melting 180g of isopentenol polyoxyethylene ether at the temperature of 80 ℃, then dropwise adding 25g of acrylic acid, 50g of amino modified polysiloxane and 0.38g of BPO into the mixture, stirring the mixture to react for 2 hours, and cooling the mixture and then slicing or grinding the mixture to obtain the shield grouting solid additive;
the molecular structure of the amino modified polysiloxane is as follows:
wherein a is 5 and b is 5
Example 2
A shield grouting material with high dispersion and high stability comprises the following components in parts by weight: 50 parts of cement, 400 parts of fly ash, 1200 parts of shield silt, 2 parts of shield grouting additive, 2 parts of thickening agent and 800 parts of water, and the mortar is prepared by adding the weighed components into a mixer and mixing for 5 min.
The shield sand fineness modulus adopted in the embodiment is 2.8, the mud content is 20%, and the sand content is more than 65%; the thickening agent is hydroxyethyl methyl cellulose ether.
The preparation process of the shield grouting solid additive comprises the following steps: melting 180g of isopentenol polyoxyethylene ether at the temperature of 80 ℃, then dropwise adding 12g of acrylic acid, 95g of amino modified polysiloxane and 0.9g of BPO into the mixture, stirring the mixture to react for 2 hours, and cooling the mixture and then slicing or grinding the mixture to obtain the shield grouting solid additive;
the molecular structure of the amino modified polysiloxane is as follows:
wherein a is 10 and b is 10
Example 3
A shield grouting material with high dispersion and high stability comprises the following components in parts by weight: 100 parts of cement, 300 parts of fly ash, 800 parts of shield silt, 1 part of shield grouting additive, 1 part of thickening agent and 600 parts of water, and the mortar is prepared by adding the weighed components into a mixer and mixing for 8 min.
The shield sand fineness modulus adopted in the embodiment is 2.6, the mud content is 10%, and the sand content is more than 65%; the thickener is xanthan gum.
The preparation process of the shield grouting solid additive comprises the following steps: melting 180g of isopentenol polyoxyethylene ether at the temperature of 80 ℃, then dropwise adding 20g of methacrylic acid, 150g of amino modified polysiloxane and 1.25g of ammonium persulfate into the isopentenol polyoxyethylene ether, stirring the mixture to react for 2 hours, and slicing or grinding the mixture after cooling to obtain the shield grouting solid additive;
the molecular structure of the amino modified polysiloxane is as follows:
wherein a is 5 and b is 20
Comparative example 1
In order to highlight the effect of the invention, according to the formula of the embodiment 1, the silane modified polycarboxylic acid water reducing agent disclosed in the field is adopted to replace the shield grouting solid additive, and the grouting material comprises the following components in parts by weight: 120 parts of cement, 250 parts of fly ash, 400 parts of shield silt, 0.5 part of shield grouting additive, 0.5 part of thickening agent and 450 parts of water; the preparation method comprises the steps of adding the weighed components into a mixer and mixing for 5 min.
The shield sand fineness modulus adopted in the embodiment is 2.4, the mud content is 5%, and the sand content is more than 65%; the thickening agent is hydroxypropyl methyl cellulose ether.
The disclosed silane modified polycarboxylic acid water reducing agent is synthesized by the water solution free radical copolymerization of Acrylic Acid (AA), isopentenyl polyoxyethylene ether (TPEG, molecular weight 2400) and methacryloxypropyltrimethoxysilane (KH-570), wherein n (AA) to n (TPEG) is 5.5: 1.0, the dosage of a chain transfer agent, hydrogen peroxide and ascorbic acid is 3%, 4% and 1% of the total monomer material respectively, and the polymerization temperature is 45 ℃.
Comparative example 2
In order to highlight the effect of the invention, according to the formula of example 1, the self-made amino modified polysiloxane component of the invention is replaced by an organosiloxane product published in the field, and the grouting material comprises the following components in parts by weight: 120 parts of cement, 250 parts of fly ash, 400 parts of shield silt, 0.5 part of shield grouting additive, 0.5 part of thickening agent and 450 parts of water; the preparation method comprises the steps of adding the weighed components into a mixer and mixing for 5 min.
The shield sand fineness modulus adopted in the embodiment is 2.4, the mud content is 5%, and the sand content is more than 65%; the thickening agent is hydroxypropyl methyl cellulose ether.
The preparation process of the shield grouting solid additive comprises the following steps: melting 180g of isopentenol polyoxyethylene ether at the temperature of 80 ℃, then dropwise adding 25g of acrylic acid, 50g of vinyl triethoxysilane and 0.35g of BPO into the mixture, stirring the mixture for reaction for 2 hours, and slicing or grinding the mixture after cooling to obtain the shield grouting solid additive.
Effects of the implementation
The shield grouting materials obtained in examples 1 to 3 and comparative examples 1 to 2 were subjected to dispersion property, water-leaching resistance and adhesion property tests, respectively, and the results are shown in table 1.
TABLE 1 dispersing, bleeding resistance and bond Strength test results of Shield grouting materials
The above results show that: under the same proportioning condition, the shield grouting material has better cement dispersing effect, obviously improved stability, difficult mortar segregation and delamination and better bonding performance with soil and stone.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (8)
1. A shield grouting material with high dispersion and high adhesion is characterized by comprising the following components in parts by weight: 50-120 parts of cement, 250-400 parts of fly ash, 400-1200 parts of shield silt, 0.5-2 parts of shield grouting solid additive, 0.5-2 parts of thickening agent and 450-800 parts of water;
the shield grouting solid additive is prepared by carrying out free radical polymerization reaction on isopentenol polyoxyethylene ether, unsaturated carboxylic acid and amino modified polysiloxane;
the structural formula of the amino modified polysiloxane is shown as a formula I:
wherein a is 1 to 50 and b is 1 to 50.
2. The high-dispersion high-adhesion shield grouting material according to claim 1, wherein the fineness modulus of the shield silt is 2.4-2.8, the silt content is 5-20 wt%, and the silt content is more than 65 wt%.
3. A high dispersion high adhesion shield grouting material as claimed in claim 1, characterized in that the cement is 42.5 ordinary portland cement.
4. The shield grouting material with high dispersion and high adhesion according to claim 1, wherein the fly ash is secondary ash.
5. The high-dispersion high-adhesion shield grouting material as claimed in claim 1, wherein the thickener is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether and xanthan gum.
6. The high-dispersion high-adhesion shield grouting material as claimed in claim 1, wherein the preparation method of the shield grouting solid admixture comprises the following steps: and melting the polyether macromonomer at the temperature of 80-100 ℃, then dropwise adding the unsaturated carboxylic acid, the amino modified polysiloxane and the initiator into the polyether macromonomer, stirring and reacting for 1-5 hours, cooling, and slicing or grinding to obtain the shield grouting solid additive.
7. The shield grouting material with high dispersion and high adhesion as claimed in claim 6, wherein the initiator is BPO or potassium persulfate, and the dosage of the initiator is 0.2-5% of the mass of the prenyl polyoxyethylene ether.
8. The shield grouting material with high dispersion and high adhesion as claimed in claim 1, wherein the mole ratio of the prenyl alcohol polyoxyethylene ether, the unsaturated carboxylic acid and the amino modified polysiloxane is 1 (2-4.7) to (0.2-1).
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| CN202011077277.6A CN112194432B (en) | 2020-10-10 | 2020-10-10 | High-dispersion high-adhesion shield grouting material |
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| CN202011077277.6A CN112194432B (en) | 2020-10-10 | 2020-10-10 | High-dispersion high-adhesion shield grouting material |
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| CN114230270A (en) * | 2021-12-07 | 2022-03-25 | 华南理工大学 | Shield synchronous grouting material and preparation method thereof |
| CN116751474A (en) * | 2023-06-28 | 2023-09-15 | 南宁骏邦建材有限公司 | Rammed earth paint and preparation method and application thereof |
| CN117801178A (en) * | 2023-12-29 | 2024-04-02 | 浙江五龙新材股份有限公司 | Polycarboxylic acid water reducer and preparation process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA862213A (en) * | 1971-01-26 | A. Haluska Loren | Polysiloxanes having pendant polycarboxylate terminated polyoxyalkylene chains | |
| CN101045831B (en) * | 2007-05-06 | 2010-07-21 | 石磊 | Modification of common soil and production method of its compound elastomer product |
| CN102993384B (en) * | 2012-08-21 | 2014-09-10 | 江苏百瑞吉新材料有限公司 | Polycarboxylate high-performance water reducing agent |
| CN103951335B (en) * | 2013-12-13 | 2016-05-11 | 中铁十四局集团有限公司 | Major diameter slurry shield discarded slurry recycles synchronous slip casting |
| CN104558434B (en) * | 2014-12-16 | 2017-11-03 | 上海台界化工有限公司 | Siliceous polycarboxylate water-reducer, preparation method and the usage |
| CN104609814B (en) * | 2014-12-24 | 2017-01-11 | 武汉市市政建设集团有限公司 | Anti-aqueous dispersion synchronous grouting material with large specific gravity and low consistence |
| CN105712645B (en) * | 2015-12-31 | 2018-08-31 | 江苏苏博特新材料股份有限公司 | A kind of additive and preparation method thereof improving Mechanical Properties of Cement-based Materials |
| CN106977153B (en) * | 2017-03-08 | 2019-08-06 | 中交第二航务工程局有限公司 | Using the shield synchronous grouting serous fluid and its construction method of the preparation of shield discarded slurry |
| 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 |
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