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

Abstract

The underwater anti-dispersion additive is prepared from the following components in parts by weight: 30 to 50 parts of a water-resistant dispersing agent, 20 to 25 parts of a water reducing agent, 20 to 25 parts of a suspending agent, 5 to 10 parts of a plastic expanding agent, 25 to 30 parts of a coagulating agent, 40 to 60 parts of sodium carbonate and 25 to 30 parts of a de-foaming agent. The grouting material is composed of the following components in parts by weight: 1000 parts of PO425 ordinary Portland cement, 5-10 parts of an underwater anti-dispersion additive and 400 parts of water. The prepared anti-dispersion cement-based grouting material has the advantages of early strength, no shrinkage, slight expansion, impermeability and high durability, is suitable for the field of underground buildings, and has a wide application prospect.

Description

Technical Field

[0002] The invention belongs to the technical field of building anti-seepage materials, and in particular relates to an underwater anti-dispersion additive and an anti-dispersion cement-based grouting material thereof. Background Art

[0003] Leakage in underground buildings is a common phenomenon, see Figure 1 At present, there are more than 10 types of grouting waterproof materials commonly used for underground building leakage, with nearly 100 models and specifications. Most of them are slurry. Grouting waterproof materials can be divided into inorganic materials, organic materials, and organic-inorganic composite materials.

[0004] Inorganic materials are commonly used for grouting waterproofing in underground buildings, mainly cement-water glass slurry. This material has good groutability, high early strength, high stone formation rate, no toxic side effects, wide raw material sources, and low prices, so it is widely used at present. However, the stone body of cement-water glass slurry shrinks greatly, and the strength decreases rapidly in the later period. After 28-90 days in water, the strength decreases significantly. After half a year, it cracks and hydrolyzes into powder, losing its utilization value. In addition, the hydrolysis rate is faster in dry conditions. Therefore, cement-water glass slurry is mostly used for temporary underground reinforcement and waterproofing projects, and its durability and stability are poor. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides an underwater anti-dispersion additive and an anti-dispersion cement-based grouting material thereof, so that the leakage and waterproof repair of underground buildings can achieve the purpose of durability.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: an underwater anti-dispersion additive, the raw materials of the additive contain at least the following in parts by weight: 30-50 parts of water-resistant dispersant, 20-25 parts of water reducing agent, 20-25 parts of suspending agent, 5-10 parts of plastic expansion agent, 25-30 parts of coagulant, 40-60 parts of soda ash, and 25-30 parts of defoaming agent; after mixing the above raw materials evenly, seal them in plastic packaging bags for later use.

[0007] Preferably, the water-resistant dispersant is hydroxypropyl methylcellulose.

[0008] Preferably, the water reducer is a polycarboxylate water reducer.

[0009] Preferably, the suspending agent is hydrated magnesium aluminum silicate.

[0010] Preferably, the coagulant is instant sodium silicate.

[0011] Preferably, the mixing process is to add all the raw materials into a dry powder mixer and stir them evenly. Preferably, the defoaming agent is a powdered organosilicon defoaming agent.

[0012] An anti-dispersion cement-based grouting material is composed of the following components in parts 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.

[0013] Preferably, ① first add 400 parts of water into the stirring pulping equipment, then add the underwater anti-dispersant, and stir for a time of t1 to allow the underwater anti-dispersant to fully dissolve in the water to form a slurry; ②Then add ordinary Portland cement and stir for t2. After it stands for t3, stir again for t4 to ensure that the cement and slurry are evenly mixed.

[0014] 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.

[0015] Preferably, the ordinary Portland cement is PO425 ordinary Portland cement.

[0016] (1) The material of the present invention makes ordinary cement slurry have the function of anti-dispersion in water by adding anti-water dispersant hydroxypropyl methylcellulose, polycarboxylic acid water reducer increases the fluidity of the slurry and improves the pourability, and the interaction of suspending agent hydrated magnesium aluminum silicate, plastic expansion agent, quick-dissolving sodium silicate and soda ash achieves the effects of early strength, no shrinkage, slight expansion, anti-seepage and strong durability of the slurry.

[0017] (2) The suspending agent hydrated magnesium aluminum silicate of the present invention fills the capillary pores in the cement slurry solid body, thereby improving the compressive strength, tensile strength and durability of the solid body.

[0018] (3) The plastic expansion agent of the present invention improves the fluidity and plasticity of the slurry, increases the compressive strength, tensile strength, crack resistance, and improves the impermeability.

[0019] (4) The instant sodium silicate of the present invention promotes cement hydration, accelerates cement solidification, improves slurry strength, and increases the stability and impermeability of cement solids.

[0020] (5) The soda ash of the present invention reacts with tricalcium silicate, tricalcium aluminate and hydrated calcium in cement to accelerate cement hydration reaction, increase the reaction activity in cement, promote crystal growth in cement, reduce porosity, and increase strength and impermeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the underground building leakage site; Figure 2 Schematic diagram of underwater anti-dispersant; Figure 3 Schematic diagram of the prepared grouting material; Figure 4 Schematic diagram of grouting construction site; Figure 5 Schematic diagram of grouting construction site; Figure 6 Schematic diagram of drilling samples after the grouting material solidifies. DETAILED DESCRIPTION

[0022] The specific implementation modes of the present invention are further described in detail below in conjunction with the embodiments.

[0023] Example 1: Raw materials and preparation of an underwater anti-dispersant. Add 45 parts of hydroxypropyl methylcellulose, 23 parts of polycarboxylate water reducer, 20 parts of water and magnesium aluminum silicate, 5 parts of plastic expansion agent, 25 parts of instant sodium silicate, 50 parts of soda ash, and 28 parts of defoaming agent into a dry powder mixer and stir for 30 minutes, then weigh and seal in a plastic bag for later use. Figure 2 Schematic diagram of the underwater anti-dispersant after unpacking.

[0024] Example 2: Preparation of an anti-dispersion cement-based grouting material, using the underwater anti-dispersion agent obtained in Example 1, comprising the following steps: First add 400 parts of water into the mixing pulper, then add 5 parts of the prepared underwater anti-dispersant, stir for 1 min to allow the underwater anti-dispersant to fully dissolve in the water; then add 1000 parts of PO425 ordinary Portland cement and stir for 3 min. After standing for 10 min, stir again for 3 min to ensure that the cement is evenly dispersed in the slurry.

[0025] Example 3: The preparation method is the same as that of Example 1, but the compositions of the components are different; the underwater anti-dispersant composition: 30 parts of hydroxypropyl methylcellulose, 20 parts of polycarboxylic acid water reducer, 20 parts of water and magnesium aluminum silicate, 5 parts of plastic expansion agent, 25 parts of instant sodium silicate, 40 parts of soda ash, and 25 parts of defoaming agent.

[0026] Example 4: Preparation of an anti-dispersion cement-based grouting material, which is prepared using the underwater anti-dispersion agent obtained in Example 3. The mixing steps are the same as in Example 2, except that the raw material ratios are changed: the anti-dispersion cement-based grouting material consists of 1000 parts of PO425 cement, 5 parts of underwater anti-dispersion additive, and 400 parts of water.

[0027] Example 5: The preparation method is the same as that of Example 1, but the components are different; the underwater anti-dispersant composition: 40 parts of hydroxypropyl methylcellulose, 22 parts of polycarboxylic acid water-reducing agent, 22 parts of water and magnesium aluminum silicate, 8 parts of plastic expansion agent, 28 parts of instant sodium silicate, 50 parts of soda ash, and 28 parts of defoaming agent.

[0028] Example 6: Preparation of an anti-dispersion cement-based grouting material, which is prepared using the underwater anti-dispersion agent obtained in Example 5. The stirring step is the same as in Example 2, except that the raw material ratio has changed: the anti-dispersion cement-based grouting material consists of 1000 parts of PO425 cement, 8 parts of underwater anti-dispersion additive, and 400 parts of water.

[0029] Example 7: The preparation method is the same as that of Example 1, but the components are different; the underwater anti-dispersant composition: 50 parts of hydroxypropyl methylcellulose, 25 parts of polycarboxylic acid water-reducing agent, 25 parts of water and magnesium aluminum silicate, 10 parts of plastic expansion agent, 30 parts of instant sodium silicate, 60 parts of soda ash, and 30 parts of defoaming agent.

[0030] Example 8: Preparation of an anti-dispersion cement-based grouting material, using the underwater anti-dispersion agent obtained in Example 7, the stirring step is the same as in Example 2, the difference is that the raw material ratio is changed: The composition of the anti-dispersion cement-based grouting material: 1000 parts of PO425 cement, 10 parts of underwater anti-dispersion additive, and 400 parts of water.

[0031] Embodiment 9: Any of the anti-dispersion cement-based grouting materials in the above embodiments 2, 4, 6, and 8 can be used for underground building leakage waterproofing repair. Depending on the site conditions, the grouting amount for one time is 1 ton to 4 tons. The specific method of use is as follows: (1) Drill grouting holes at the water seepage point, the depth of which is below the cushion layer under the concrete structure layer of the building, with a hole diameter of 32 cm, and install a sealer at the top of the grouting hole; (2) Use a cement pressure grouting machine to inject grout (the grouting pump can be a plunger pump, hose pump, or screw pump). The pressure is controlled at 0.5-1.5 MPa. When the pressure is stable, stop injecting. As the grout is pressed in, the amount of water seepage will gradually decrease. (3) After 24 hours, if there is no visible water seepage, remove the hole sealer and fill the grouting holes with polymer waterproof mortar.

[0032] Through the above construction work, the accumulated water inside the building floor, inside the cushion layer and under the cushion layer is drained away, so that the anti-dispersion cement-based grouting material can penetrate, squeeze, fill and form a water barrier in the micropores, small holes and cracks along the way, and consolidate the soil under the cushion layer into a stone body, which plays the role of anti-seepage, waterproofing and strengthening the foundation. Figure 6 The figure below is a schematic diagram of drilling samples after the grouting material solidifies.

Claims

1. An underwater anti-dispersion additive, the raw materials of which contain at least the following in parts by weight: 30-50 parts of water-resistant dispersant, 20-25 parts of water reducing agent, 20-25 parts of suspending agent, 5-10 parts of plastic expansion agent, 25-30 parts of coagulant, 40-60 parts of soda ash, and 25-30 parts of defoaming agent; after mixing the above raw materials evenly, seal them in plastic packaging bags for later use.

2. The underwater anti-dispersion additive according to claim 1, characterized in that: The water-resistant dispersant is hydroxypropyl methylcellulose.

3. The underwater anti-dispersion additive according to claim 1, characterized in that: The water reducing agent is a polycarboxylate water reducing agent.

4. The underwater anti-dispersion additive according to claim 1, characterized in that: The suspending agent is hydrated magnesium aluminum silicate.

5. The underwater anti-dispersion additive according to claim 1, characterized in that: The coagulant is instant sodium silicate.

6. The underwater anti-dispersion additive according to claim 1, characterized in that: The mixing process is to add all the raw materials into a dry powder mixer and mix them evenly.

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

8. The method for preparing the anti-dispersion cement-based grouting material according to claim 7, characterized in that: ① First add 400 parts of water into the stirring pulping equipment, then add the underwater anti-dispersant, and stir for t1 to allow the underwater anti-dispersant to fully dissolve in the water to form a slurry; ②Then add ordinary Portland cement and stir for t2. After it stands for t3, stir again for t4 to ensure that the cement and slurry are evenly mixed.

9. The method for preparing the anti-dispersion cement-based grouting material according to claim 7, characterized in that: 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, characterized in that: The ordinary Portland cement is PO425 ordinary Portland cement.

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