CN108911568B - Grouting material additive and application thereof - Google Patents
Grouting material additive and application thereof Download PDFInfo
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- CN108911568B CN108911568B CN201810835021.3A CN201810835021A CN108911568B CN 108911568 B CN108911568 B CN 108911568B CN 201810835021 A CN201810835021 A CN 201810835021A CN 108911568 B CN108911568 B CN 108911568B
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- grouting material
- cement clinker
- superfine
- material additive
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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
- 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
-
- 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
Abstract
The invention provides a grouting material additive which comprises the following components in parts by weight: 370-670 parts of superfine cement clinker; 0.25-0.55 parts of sodium aluminate; 150-300 parts of beta hemihydrate gypsum; 0.5-1 part of borax; 20-40 parts of a polycarboxylic acid water reducing agent; 2-5 parts of hydroxyethyl cellulose ether and 5-10 parts of sodium polyacrylate; the surface area of the superfine cement clinker is 700-900 cm2(ii) in terms of/g. When the grouting material additive is added into slurry, the initial setting time can reach 8 minutes, the final setting time is 3 minutes, and the grouting material additive has good plugging and reinforcing functions after curing.
Description
Technical Field
The invention relates to the technical field of grouting materials in building materials, in particular to a grouting material additive and application thereof.
Background
With the rapid development of economy in China, the scale of traffic and water conservancy construction (such as high-speed rails, subways, highways and dams) is larger and larger. The geological conditions of China with broad breadth and changeable landform are complex; the complex geological conditions make underground engineering and water conservancy engineering increasingly receive attention from people. As high-speed rails, subways and dams are continuously increased, and underground traffic hydraulic engineering conditions are increasingly complex, the problems of collapse, water inrush, mud gushing and the like are gradually developed. In order to solve the problems, people often adopt a grouting technology to reinforce and plug underground engineering and hydraulic engineering.
The grouting technology is to prepare a material with filling and cementing properties into slurry, and inject the slurry into a body to be injected by using a proper pressurized grouting device, such as cracks, pores or holes of a stratum, so that the slurry permeates and fills, and is coagulated and hardened, thereby achieving the purpose of reinforcement or plugging. Therefore, grouting materials are key to ensure the reinforcement and plugging of underground and hydraulic engineering. However, the existing grouting material also has the problems of slow hydration reaction speed, incapability of realizing quick plugging and poor reinforcing and plugging effects.
Disclosure of Invention
The grouting material additive provided by the invention is added into slurry, the initial setting time can reach 8 minutes, the final setting time is 3 minutes, rapid plugging can be realized, and the grouting material additive has good plugging and reinforcing functions after curing.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a grouting material additive which comprises the following components in parts by weight:
the specific surface area of the superfine cement clinker is 700-900 cm2/g。
Preferably, the superfine cement clinker is one or more of superfine sulphoaluminate cement clinker, superfine ferro-aluminate cement clinker and superfine ordinary silicate cement clinker.
Preferably, the hydroxyethyl cellulose ether has a viscosity of 40000mpa.s or less.
Preferably, the molecular weight of the sodium polyacrylate is 10000 or more.
The invention also provides the application of the grouting material additive in the technical scheme in plugging and reinforcing of the underwater karst cave.
Preferably, the grouting material additive is mixed with a grouting material to obtain a grouting mixed material; and (4) injecting the grouting mixed material into the gap and then standing.
Preferably, the grouting material is ordinary silicate cement paste or slurry.
Preferably, the dosage of the grouting material additive is 5-15% of the mass of the common silicate cement slurry or 8-15% of the mass of the slurry.
The invention provides a grouting material additive which comprises the following components in parts by weight: 370-670 parts of superfine cement clinker; 0.25-0.55 parts of sodium aluminate; 150-300 parts of beta hemihydrate gypsum; 0.5-1 part of borax; 20-40 parts of a polycarboxylic acid water reducing agent; 2-5 parts of hydroxyethyl cellulose ether and 5-10 parts of sodium polyacrylate; the surface area of the superfine cement clinker is 700-900 cm2(ii) in terms of/g. The superfine cement clinker in the grouting material additive provided by the invention has great surface activity, and can be quickly added into slurry together with sodium aluminate, beta hemihydrate gypsum, borax, polycarboxylic acid water reducer, hydroxyethyl cellulose ether and sodium polyacrylateThe slurry is subjected to hydration reaction, so that the rapid leakage stoppage is realized. The results of the examples show that when the grouting material additive is added into slurry, the initial setting time can reach 8 minutes, and the final setting time is 3 minutes (the initial setting refers to the condition that the slurry loses plasticity from the beginning of adding water to the slurry, and the final setting refers to the condition that the slurry loses plasticity from the beginning to the complete loss of plasticity), and the grouting material additive has good plugging and reinforcing functions after being cured.
Detailed Description
The invention provides a grouting material additive which comprises the following components in parts by weight:
the specific surface area of the superfine cement clinker is 700-900 cm2/g。
The grouting material additive comprises 370-670 parts by mass of superfine cement clinker, preferably 400-650 parts by mass, and more preferably 450-600 parts by mass. In the invention, the specific surface area of the superfine cement clinker is 700-900 cm2G, preferably 800cm2(ii) in terms of/g. The superfine cement clinker has larger surface activity, can quickly generate hydration reaction with a grouting material, and is further favorable for realizing quick plugging and reinforcement.
In the invention, the superfine cement clinker is preferably formed by superfine grinding of raw material cement clinker; the invention has no special requirements on the implementation mode of the superfine mill, and the superfine mill implementation mode which is well known by the technical personnel in the field can be adopted; the cement clinker is preferably one or more of sulphoaluminate cement clinker, ferroaluminate cement clinker and Portland cement clinker. The invention has no special requirements on the chemical composition and mineral composition of the sulphoaluminate cement clinker, the ferroaluminate cement clinker and the ordinary silicate cement clinker, and the chemical composition and mineral composition of the sulphoaluminate cement clinker, the ferroaluminate cement clinker and the ordinary silicate cement clinker which are well known by the technical personnel in the field can be adopted. In the invention, the superfine sulphoaluminate cement clinker or the superfine ferroaluminate cement clinker has the characteristics of high early strength, quick setting and good freezing resistance, and after the superfine sulphoaluminate cement clinker or the superfine ferroaluminate cement clinker is compounded with ordinary portland cement or slurry, hydration reaction can be quickly carried out under the action of beta hemihydrate gypsum and sodium aluminate to generate ettringite, namely calcium sulphoaluminate concretion; and the content of alumina in the superfine sulphoaluminate cement clinker or the superfine ferro-aluminate cement clinker is higher, the common Portland cement clinker provides enough hydrated aluminum ions in the presence of sodium aluminate, and the aluminum ions can generate a crosslinking reaction with organic polymers in the components to form a stable molecular structure, so that the cementation effect among particles is improved, and the performance of the grouting material is improved.
The grouting material additive comprises, by weight, 0.25-0.55 parts of sodium aluminate, preferably 0.30-0.55 parts, and more preferably 0.35-0.50 parts of the superfine cement clinker. The source of the sodium aluminate used in the present invention is not particularly limited, and any source of sodium aluminate known to those skilled in the art, such as commercially available sodium aluminate, may be used. The sodium aluminate is used as the coagulation regulating early strength agent of the superfine cement clinker, has obvious early strength effect and does not influence the improvement of later strength.
Based on the weight parts of the superfine cement clinker, the grouting material additive provided by the invention comprises 150-300 parts of beta hemihydrate gypsum, preferably 160-290 parts, and more preferably 200-270 parts. The source of the beta hemihydrate gypsum is not particularly required in the present invention, and any source of beta hemihydrate gypsum known to those skilled in the art may be used, such as commercially available building gypsum. The beta hemihydrate gypsum provided by the invention is used as an accelerator, can accelerate the setting time of the grouting material, well solidifies harmful substances and promotes the hydration of the superfine cement clinker.
The grouting material additive provided by the invention comprises 0.5-1 part of borax, preferably 0.7-1 part of borax, and more preferably 0.8-1 part of borax by weight. The source of the borax is not particularly required in the invention, and the source of the borax known to those skilled in the art can be adopted, such as the commercial borax. The borax of the invention is a retarder of beta semi-hydrated gypsum, and can also adjust the setting time of the superfine cement clinker to meet the construction performance.
The grouting material additive comprises, by weight, 20-40 parts of a polycarboxylic acid water reducing agent, preferably 25-35 parts of the polycarboxylic acid water reducing agent, and more preferably 25-30 parts of the polycarboxylic acid water reducing agent. The source of the polycarboxylate water reducer is not particularly required in the invention, and the source of the polycarboxylate water reducer known to those skilled in the art can be adopted, such as a commercially available polycarboxylate water reducer. According to the invention, the polycarboxylic acid water reducing agent is taken as a dispersing agent, so that the fluidity of the grouting material can be improved, and water loss and secondary pollution can be prevented; in addition, the polycarboxylate superplasticizer can improve surface tension, so that the surface tension is lower, the permeability is higher, and the durability of the grouting material is improved.
The grouting material additive provided by the invention comprises 2-5 parts of hydroxyethyl cellulose ether, preferably 3-5 parts, and more preferably 4-5 parts by weight based on the parts by weight of the superfine cement clinker. In the present invention, the viscosity of the hydroxyethyl cellulose ether is preferably 40000mpa.s or less, more preferably 35000mpa.s or less, and still more preferably 10000 to 15000 mpa.s. The source of the hydroxyethyl cellulose ether is not particularly required in the present invention, and those known to those skilled in the art can be used. The hydroxyethyl cellulose ether can ensure that the grouting material can be smoothly injected into the ground through the grouting pipe.
The grouting material additive provided by the invention comprises 5-10 parts of sodium polyacrylate, preferably 6-9 parts of sodium polyacrylate, and more preferably 6-8 parts of sodium polyacrylate. In the present invention, the molecular weight of the sodium polyacrylate is preferably 10000 or more, more preferably 15000 or more, and further preferably 20000 to 30000. The source of the sodium polyacrylate is not particularly required in the invention, and the sodium polyacrylate known to those skilled in the art can be used, such as commercially available sodium polyacrylate. The sodium polyacrylate of the invention can absorb water with several times of the volume of the sodium polyacrylate without precipitation, can be crosslinked to form water-insoluble gel under the synergistic effect of sodium aluminate, increases the adhesive property of the slurry, and forms an organic-inorganic interpenetrating network structure by being combined with cement clinker through chemical bonds to become a tough stone-forming body with strength.
The preparation method of the grouting material additive does not have any special requirement, and a preparation mode of the composition which is well known by a person skilled in the art is adopted; in the embodiment of the invention, the raw material components can be directly and uniformly mixed.
The invention also provides an application of the grouting material additive in the technical scheme in water-soluble hole plugging reinforcement. In the present invention, the application preferably comprises: mixing the grouting material additive with a grouting material to obtain a grouting mixed material; and (4) injecting the grouting mixed material into the gap and then standing. In the present invention, the grouting material preferably comprises a normal silicate cement slurry or slurry; the invention has no special requirements on the source of the ordinary silicate cement paste and the slurry, and the ordinary silicate cement paste and the slurry which are well known by the technical personnel in the field can be adopted. In the present invention, the grouting material and the grouting material additive are preferably mixed in the following manner: and directly adding the grouting material additive into the grouting material. The invention has no special requirements on the injection mode of the grouting mixing material, and the mode known by the technicians in the field is adopted; in the embodiment of the invention, grouting equipment is particularly adopted for injection. The invention has no special requirement on the standing time so as to achieve the effect of complete solidification. In the standing process, the grouting mixed material is replaced, filled and consolidated to form a stone body so as to realize the reinforcement and plugging of the water-soluble cave.
In the invention, when the grouting material is ordinary silicate cement paste, the addition amount of the grouting material additive is preferably 5-15% of the mass of the cement paste, and more preferably 10%; when the grouting material is slurry, the addition amount of the grouting material additive is preferably 8-15% of the mass of the slurry, more preferably 10-15%, and even more preferably 15%.
The following examples are provided to illustrate the grouting material additive and its application, but they should not be construed as limiting the scope of the present invention.
Example 1
The self-purchased sulphoaluminate cement clinker is subjected to superfine grinding to ensure that the surface area reaches 900cm2Obtaining superfine sulphoaluminate cement clinker;
according to the weight parts, 400 parts of superfine cement clinker, 0.25 part of sodium aluminate, 160 parts of beta semi-hydrated gypsum, 0.6 part of borax, 25 parts of polycarboxylic acid water reducer, 2 parts of hydroxyethyl cellulose ether with the viscosity of 30000mpa.s and 6 parts of sodium polyacrylate with the molecular weight of 15000 are sequentially added into a screw stirrer to be stirred for 3min, and the grouting material additive is obtained for later use.
Adding the obtained grouting material additive into common silicate cement slurry for performance test, wherein when the addition amount of the grouting material additive is 5% of the mass of the cement slurry, the initial setting time is 25 minutes, and the curing time is 20 minutes; when the dosage of the grouting material additive is 10 percent of the mass of the cement paste, the initial setting time is 15 minutes, and the final setting time is 8 minutes; when the additive accounts for 15% of the mass of cement paste, the initial setting time is 8 minutes, and the final setting time is 3 minutes.
Example 2
The self-purchased sulphoaluminate cement clinker is subjected to superfine grinding to ensure that the surface area reaches 800cm2Obtaining superfine sulphoaluminate cement clinker;
according to the weight parts, 500 parts of superfine cement clinker, 0.4 part of sodium aluminate, 240 parts of beta semi-hydrated gypsum, 0.8 part of borax, 31 parts of polycarboxylic acid water reducing agent, 3.5 parts of hydroxyethyl cellulose ether with viscosity of 20000mpa.s and 7 parts of sodium polyacrylate with molecular weight of 20000 are sequentially added into a gong-bar stirrer to be stirred for 4min, and the grouting material additive is obtained for later use.
Adding the obtained grouting material additive into common silicate cement slurry for performance test, wherein when the addition amount of the grouting material additive is 5% of the mass of the cement slurry, the initial setting time is 25 minutes, and the curing time is 20 minutes; when the dosage of the grouting material additive is 10 percent of the mass of the cement paste, the initial setting time is 15 minutes, and the final setting time is 8 minutes; when the additive accounts for 15% of the mass of cement paste, the initial setting time is 8 minutes, and the final setting time is 3 minutes.
Example 3
The self-purchased iron aluminate cement clinker is subjected to superfine grinding to ensure that the surface area reaches 700cm2Obtaining superfine iron aluminate cement clinker;
according to the weight parts, 600 parts of superfine cement clinker, 0.55 part of sodium aluminate, 280 parts of beta semi-hydrated gypsum, 1 part of borax, 38 parts of polycarboxylic acid water reducing agent, 5 parts of hydroxyethyl cellulose ether with the viscosity of 15000mpa.s and 10 parts of sodium polyacrylate with the molecular weight of 25000 are sequentially added into a screw stirrer to be stirred for 4min, and the grouting material additive is obtained for later use.
Adding the obtained grouting material additive into common silicate cement slurry for performance test, wherein when the addition amount of the grouting material additive is 5% of the mass of the cement slurry, the initial setting time is 25 minutes, and the curing time is 20 minutes; when the dosage of the grouting material additive is 10 percent of the mass of the cement paste, the initial setting time is 15 minutes, and the final setting time is 8 minutes; when the additive accounts for 15% of the mass of cement paste, the initial setting time is 8 minutes, and the final setting time is 3 minutes.
The embodiment shows that the grouting material additive provided by the invention comprises the following components in parts by weight: 370-670 parts of superfine cement clinker; 0.25-0.55 parts of sodium aluminate; 150-300 parts of beta hemihydrate gypsum; 0.5-1 part of borax; 20-40 parts of a polycarboxylic acid water reducing agent; 2-5 parts of hydroxyethyl cellulose ether and 5-10 parts of sodium polyacrylate; the surface area of the superfine cement clinker is 700-900 cm2(ii) in terms of/g. When the grouting material additive provided by the invention is added into slurry, the initial setting time can reach 8 minutes, the final setting time is 3 minutes, rapid plugging can be realized, and the grouting material additive has good plugging and reinforcing functions after curing.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The grouting material additive comprises the following components in parts by weight:
370-670 parts of superfine cement clinker;
0.25-0.55 parts of sodium aluminate;
150-300 parts of beta hemihydrate gypsum;
0.5-1 part of borax;
20-40 parts of a polycarboxylic acid water reducing agent;
2-5 parts of hydroxyethyl cellulose ether;
5-10 parts of sodium polyacrylate;
the specific surface area of the superfine cement clinker is 700-900 cm2/g；
The superfine cement clinker is one or more of superfine sulphoaluminate cement clinker and superfine ferro-aluminate cement clinker;
the viscosity of the hydroxyethyl cellulose ether is below 40000mPa & s; the molecular weight of the sodium polyacrylate is more than 10000.
2. The grouting material additive as claimed in claim 1 is applied to plugging and reinforcing of an underwater cave.
3. The application according to claim 2, wherein the application comprises: mixing the grouting material additive with a grouting material to obtain a grouting mixed material; and (4) injecting the grouting mixed material into the gap and then standing.
4. Use according to claim 3, wherein the grouting material is a normal silicate cement slurry.
5. The use according to claim 4, wherein the grouting material additive is used in an amount of 5-15% by mass of the ordinary portland cement slurry.
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| CN113089640A (en) * | 2021-03-26 | 2021-07-09 | 广东睿博建筑设计研究有限公司 | Foundation treatment method |
| CN113149570A (en) * | 2021-05-11 | 2021-07-23 | 山东尔多新材料有限公司 | Novel blast hole sealing grouting material and preparation method thereof |
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