CN119874250A

CN119874250A - Underwater anti-dispersion additive and anti-dispersion cement-based grouting material thereof

Info

Publication number: CN119874250A
Application number: CN202411907314.XA
Authority: CN
Inventors: 邢国胜
Original assignee: Individual
Current assignee: Individual
Priority date: 2024-12-24
Filing date: 2024-12-24
Publication date: 2025-04-25

Abstract

The invention discloses an underwater anti-dispersion additive and an anti-dispersion cement-based grouting material thereof, wherein the underwater anti-dispersion additive comprises, by weight, 30-50 parts of a water-resistant dispersing agent, 20-25 parts of a water reducing agent, 20-25 parts of a suspending agent, 5-10 parts of a plastic expanding agent, 25-30 parts of a coagulating agent, 40-60 parts of sodium carbonate and 25-30 parts of a defoaming agent, and the grouting material comprises, by weight, 1000 parts of PO425 ordinary Portland cement, 5-10 parts of an underwater anti-dispersion additive and 400 parts of water. The anti-dispersion cement-based grouting material prepared by the invention has the advantages of early strength, no shrinkage, micro expansion, impermeability and strong durability, is suitable for the field of underground construction, and has wide application prospect.

Description

Underwater anti-dispersion additive and anti-dispersion cement-based grouting material thereof

Technical Field

The invention belongs to the technical field of building anti-seepage materials, and particularly relates to an underwater anti-dispersion additive and an anti-dispersion cement-based grouting material thereof.

Background

The leakage of underground construction is a common phenomenon, referring to fig. 1, the grouting waterproof materials commonly used for the leakage of underground construction at present have more than 10 types, nearly hundred types and specifications, and most of grouting waterproof materials are slurry, and the grouting waterproof materials can be divided into inorganic materials, organic materials and organic-inorganic composite materials.

The inorganic material is used as the grouting waterproof material for the underground building, mainly cement-water glass slurry, has good pourability, high early strength, high calculus rate, no toxic or side effect, wide raw material source and low price, and is widely applied at present. However, the cement-water glass slurry has large dry shrinkage, the strength is rapidly reduced in the later period, the strength is obviously reduced after 28-90 days in water, the cement-water glass slurry is cracked and hydrolyzed into powder after half a year, the utilization value is lost, and the hydrolysis speed is faster under the condition of drying, so that the cement-water glass slurry is mostly used for temporary underground reinforcement and seepage prevention engineering, and the durability and the stability are poor.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an underwater anti-dispersion additive and an anti-dispersion cement-based grouting material thereof, so that the purpose of durability is achieved for underground building leakage waterproof maintenance.

In order to achieve the purpose, the invention adopts the technical scheme that the underwater anti-dispersion additive comprises the following raw materials in parts by weight:

30-50 parts of water-resistant dispersing agent, 20-25 parts of water reducer, 20-25 parts of suspending agent, 5-10 parts of plastic expanding agent, 25-30 parts of coagulating agent, 40-60 parts of sodium carbonate and 25-30 parts of defoaming agent, and sealing and packaging the materials for standby by using a plastic packaging bag after the raw materials are uniformly mixed.

Preferably, the water-resistant dispersing agent is hydroxypropyl methylcellulose.

Preferably, the water reducer is a polycarboxylate water reducer.

Preferably, the suspending agent is hydrated magnesium aluminum silicate.

Preferably, the coagulating agent is instant sodium silicate.

Preferably, the mixing process is to add all the raw materials into a dry powder mixer and stir uniformly. Preferably, the defoamer is a powdery organosilicon defoamer.

An anti-dispersion cement-based grouting material comprises, by weight, 1000 parts of ordinary Portland cement, 5-10 parts of the underwater anti-dispersion additive according to any one of claims 1-6, and 400 parts of water.

Preferably, ① parts of water is added into the stirring pulping equipment, then the underwater anti-dispersant is added, and stirring time t1 is carried out, so that the underwater anti-dispersant is fully dissolved in the water to form slurry;

② Then adding ordinary Portland cement, stirring t2, standing for t3, and stirring again for t4 to mix cement and slurry uniformly.

Preferably, the time t1 is 1 minute, the time t2 is 3 minutes, the time t3 is 10 minutes, and the time t4 is 3 minutes.

Preferably, the Portland cement is PO425 Portland cement.

(1) The material of the invention has the functions of dispersing resistance in water by adding the water-resistant dispersant hydroxypropyl methylcellulose, the polycarboxylic acid water reducer increases the fluidity of the slurry and improves the pourability, and the functions of early strength, no shrinkage, micro expansion, impermeability and strong durability of the slurry are realized by the interaction of the suspending agent hydrated magnesium aluminum silicate, the plastic expansion agent, the instant sodium silicate and the sodium carbonate.

(2) The suspending agent of the invention, namely the hydrated magnesium aluminum silicate, fills capillary pores in the consolidated body of the cement slurry, thereby improving the compressive strength, the tensile strength and the durability of the consolidated body.

(3) The plastic expanding agent improves the fluidity and the plasticity of the slurry, increases the compressive strength, the tensile strength and the cracking resistance, and improves the impermeability.

(4) The instant sodium silicate of the invention promotes the hydration of cement, accelerates the solidification of cement, improves the strength of slurry, and increases the stability and impermeability of cement bonded bodies.

(5) The sodium carbonate reacts with substances such as tricalcium silicate, tricalcium aluminate, calcium hydrate and the like in cement, accelerates the hydration reaction of the cement, improves the reactivity in the cement, promotes the crystal growth in the cement, reduces the porosity, and improves the strength and the impermeability.

Drawings

FIG. 1 is a schematic illustration of a leak site of an underground construction;

FIG. 2 is a schematic view of an underwater anti-dispersant;

FIG. 3 is a schematic illustration of the formulated grouting material;

FIG. 4 is a schematic illustration of a grouting construction site;

FIG. 5 is a schematic illustration of a grouting construction site;

FIG. 6 is a schematic illustration of a sample drilled after setting of the grouting material.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to examples.

An embodiment I is a raw material of an underwater anti-dispersant and a preparation method thereof. 45 parts of hydroxypropyl methyl cellulose, 23 parts of polycarboxylate water reducer, 20 parts of water and magnesium aluminum silicate, 5 parts of plastic expanding agent, 25 parts of instant sodium silicate, 50 parts of sodium carbonate and 28 parts of defoamer are added into a dry powder mixer to be stirred for 30min parts, then the mixture is weighed, and a plastic packaging bag is sealed and packaged for standby, and FIG. 2 is a schematic diagram of the unpacked underwater anti-dispersant.

The second embodiment is a preparation of an anti-dispersion cement-based grouting material, which is prepared by adopting the underwater anti-dispersing agent obtained in the first embodiment, and comprises the following steps:

400 parts of water is firstly added into a stirring pulping machine, then 5 parts of prepared underwater anti-dispersant are added, stirring is carried out for 1 min parts of prepared underwater anti-dispersant is carried out, so that the underwater anti-dispersant is fully dissolved in the water, then 1000 parts of PO425 ordinary Portland cement is added, stirring is carried out for 3 min, standing is carried out for 10 min, and stirring is carried out for 3 min again, so that the cement is uniformly dispersed in the slurry.

The third embodiment is that the preparation method is the same as the first embodiment, and the components are different, and the underwater anti-dispersant comprises 30 parts of hydroxypropyl methyl cellulose, 20 parts of polycarboxylate water reducer, 20 parts of water and magnesium aluminum silicate, 5 parts of plastic expanding agent, 25 parts of instant sodium silicate, 40 parts of sodium carbonate and 25 parts of defoamer.

In the fourth embodiment, the underwater anti-dispersant obtained in the third embodiment is used for preparing the anti-dispersion cement-based grouting material, and the mixing steps are the same as those in the second embodiment, wherein the mixing steps are different from those in the second embodiment in that the raw material proportion of the anti-dispersion cement-based grouting material is changed, and the anti-dispersion cement-based grouting material comprises 1000 parts of PO425 cement, 5 parts of an underwater anti-dispersion additive and 400 parts of water.

The fifth embodiment is that the preparation method is the same as the first embodiment, and the components are different, and the underwater anti-dispersant comprises 40 parts of hydroxypropyl methyl cellulose, 22 parts of polycarboxylate water reducer, 22 parts of water and magnesium aluminum silicate, 8 parts of plastic expanding agent, 28 parts of instant sodium silicate, 50 parts of sodium carbonate and 28 parts of defoamer.

In the sixth embodiment, the underwater anti-dispersant obtained in the fifth embodiment is used for preparing the anti-dispersion cement-based grouting material, and the stirring step is the same as that in the second embodiment, wherein the anti-dispersion cement-based grouting material is composed of 1000 parts of PO425 cement, 8 parts of underwater anti-dispersion additive and 400 parts of water according to different raw material proportions.

The seventh embodiment is that the preparation method is the same as that of the first embodiment, and the components are different, and the underwater anti-dispersant comprises 50 parts of hydroxypropyl methyl cellulose, 25 parts of polycarboxylate superplasticizer, 25 parts of water and magnesium aluminum silicate, 10 parts of plastic expanding agent, 30 parts of instant sodium silicate, 60 parts of sodium carbonate and 30 parts of defoamer.

An eighth embodiment is a preparation method of an anti-dispersion cement-based grouting material, which adopts the underwater anti-dispersing agent obtained in the seventh embodiment, and the stirring step is the same as that of the second embodiment, and the proportions of the different raw materials are changed:

the anti-dispersion cement-based grouting material comprises 1000 parts of PO425 cement, 10 parts of underwater anti-dispersion additive and 400 parts of water.

An embodiment nine, wherein any one of the anti-dispersion cement-based grouting materials in the embodiment two, four, six and eight can be used for underground building leakage waterproof maintenance, and the grouting dosage for one time is 1 ton to 4 tons according to the field condition, and the concrete using method is as follows:

(1) Drilling a grouting hole at the water seepage position, deeply drilling the grouting hole below a cushion layer below a concrete structure layer of a building, wherein the aperture is 32 cm, and the upper end of the grouting hole is provided with a hole packer;

(2) Grouting slurry by using a cement pressure grouting machine (a grouting pump can adopt a plunger pump, a hose pump and a screw pump), controlling the pressure to be 0.5-1.5MPa, stopping grouting when the pressure is stable, and gradually reducing the water seepage amount along with the pressing of the slurry;

(3) And after 24 h, if no clear water is oozed out, removing the hole packer, and filling the grouting holes with polymer waterproof mortar.

Through the construction operation, accumulated water in the building bottom plate, the cushion layer and the under-cushion layer is drained, so that a water-blocking barrier is formed in the dispersion-resistant cement-based grouting material penetrating, extruding, filling and along-way micropores, small holes and cracks, soil under the cushion layer is solidified into a stone body, the effects of impermeability, water resistance and foundation reinforcement are achieved, and a schematic diagram of a sample drilling after grouting material solidification is shown in fig. 6.

Claims

1. An underwater anti-dispersion additive comprises the following raw materials in parts by weight:

2. The underwater anti-dispersion additive of claim 1 wherein the water-resistant dispersant is hydroxypropyl methylcellulose.

3. The underwater anti-dispersion additive of claim 1, wherein the water reducing agent is a polycarboxylate water reducing agent.

4. An underwater anti-dispersion additive as claimed in claim 1 wherein the suspending agent is hydrated magnesium aluminium silicate.

5. An underwater anti-dispersion additive as claimed in claim 1 wherein the coagulating agent is instant sodium silicate.

6. The underwater anti-dispersion additive of claim 1, wherein the mixing process is to add all the raw materials into a dry powder mixer and stir them uniformly.

7. An anti-dispersion cement-based grouting material comprises, by weight, 1000 parts of ordinary Portland cement, 5-10 parts of the underwater anti-dispersion additive according to any one of claims 1-6, and 400 parts of water.

8. The method for producing the anti-dispersion cement-based grouting material according to claim 7, wherein:

① 400 parts of water is firstly added into stirring pulping equipment, then an underwater anti-dispersant is added, and stirring time t1 is carried out, so that the underwater anti-dispersant is fully dissolved in the water to form slurry;

9. The method of manufacturing an anti-dispersion cement-based grouting material according to claim 7, wherein the time t1 is 1 minute, the time t2 is 3 minutes, the time t3 is 10 minutes, and the time t4 is 3 minutes.

10. The method for preparing the anti-dispersion cement-based grouting material according to claim 7, wherein the Portland cement is PO425 Portland cement.