Permeation-reducing compact anti-dispersion cement soil admixture and preparation method thereof

Abstract

The invention relates to the field of cement-soil admixtures and preparation methods thereof, in particular to a permeability-reducing compact anti-dispersion cement-soil admixture. 15 to 20 parts of slag powder; 15 to 20 parts of fly ash; 8 to 10 parts of fiber; 1 part to 1.5 parts of a water reducing agent; 1.5 to 2 parts of an anti-dispersing agent; 0.5 to 3 parts of silica fume; 0.5 to 3 parts of a waterproof agent; 6-10 parts of an expanding agent; 0.5 to 3 parts of a preservative; the permeability-reducing compact anti-dispersion cement soil admixture provided by the invention is added into cement soil according to the proportion and is uniformly stirred, the crack resistance reaches P12, the service life is prolonged by 3-8 years compared with that of the traditional cement soil without leakage and cracking, the cement soil admixture with excellent performance and stable quality can be prepared through raw material preparation, raw material mixing, preparation and pH adjustment, and the cement soil admixture is suitable for large-scale popularization and application. And the requirements of different projects are met.

Description

Technical Field

[0001] The invention relates to the field of cement soil admixtures and preparation methods thereof, and in particular to a cement soil admixture capable of reducing permeability, compacting and resisting dispersion and a preparation method thereof. Background Art

[0002] With the development of society, the demand for urban facilities has increased, the construction industry has advanced rapidly, and the use of cement soil, as a member of the building materials, has also increased dramatically. Cement soil is a material made of a mixture of sand and gravel aggregates, cement, water and other external materials.

[0003] However, the existing cement soil will have many problems when used, such as cracks caused by temperature changes, shrinkage, expansion, or external forces, which reduce the bearing capacity, durability and impermeability of cement soil materials, and affect the appearance and service life of buildings. The commonly used high-aluminum cement is prepared by adding fluorgypsum, fly ash, phenol, etc., and because a large amount of high-aluminum cement is added, the alkalinity is high, which easily leads to a decrease in the strength of cement soil in the later stage. In addition, since phenol is difficult to dissolve in water, it is difficult to play a role during use, so the anti-cracking and leak-proof effect of traditional expansion agents is not good.

[0004] Therefore, in order to solve the problem that the anti-cracking, anti-permeability, anti-dispersion and corrosion resistance effects of the above-mentioned admixtures after being added to cement soil are not ideal, a cement soil admixture with reduced permeability, compaction and anti-dispersion and a preparation method thereof can be designed. Summary of the invention

[0005] In order to overcome the problem that the anti-cracking, anti-seepage, anti-dispersion and corrosion resistance effects are not ideal after the admixture is added to cement soil.

[0006] The technical solution of the present invention is: a cement soil admixture with reduced permeability, compaction and anti-dispersion, the proportions of which are as follows in parts by weight:

[0007] Slag powder: 15-20 parts;

[0008] Fly ash: 15-20 parts;

[0009] Fiber: 8-10 parts;

[0010] Water reducing agent: 1 to 1.5 parts;

[0011] Anti-dispersant: 1.5 to 2 parts;

[0012] Microsilica fume: 0.5-3 parts;

[0013] Waterproofing agent: 0.5-3 parts;

[0014] Expanding agent: 6-10 parts;

[0015] Preservatives: 0.5 to 3 parts.

[0016] Preferably, the slag powder is aluminum slag powder, steel slag powder or a combination of the two; the slag powder fineness standard is 450 mesh to 550 mesh.

[0017] Preferably, the fiber is one or a combination of carbon fiber, glass fiber, polypropylene fiber, steel fiber, and high-strength polyester fiber.

[0018] Preferably, the water reducer is aminobenzenesulfonic acid or polycarboxylic acid water reducer.

[0019] Preferably, the anti-dispersant is a polycarboxylic acid dispersant or a phosphate dispersant.

[0020] A method for preparing a cement soil admixture with reduced permeability, compaction and anti-dispersion, comprising the above-mentioned cement soil admixture with reduced permeability, compaction and anti-dispersion, and the steps are as follows;

[0021] Step 1: Raw material preparation:

[0022] The slag powder is measured, and the activity index, water demand ratio and fineness of the slag powder must meet the standards. Then the fiber is pretreated to make the fiber length basically between 0.2 and 6.0 mm.

[0023] Step 2 Premixing of raw materials:

[0024] According to the formula of admixture, weigh the required raw materials according to the weight ratio, put slag powder, fly ash, microsilica powder and fiber into the high-speed mixer, set the mixing parameters and perform dry mixing;

[0025] Put the water reducing agent, anti-dispersant, waterproofing agent, expansion agent and preservative into a low-speed mixer, add water, set the mixing parameters, and perform wet mixing to ensure that the water reducing agent, anti-dispersant, waterproofing agent, expansion agent and preservative are fully dissolved in water to form a solution;

[0026] Step 3: Preparation of admixture:

[0027] Divide the solution into 4-5 equal portions and add them to the powder in a high-speed mixer at 40℃-45℃ to ensure that all components of the cement soil admixture are fully dispersed and evenly mixed;

[0028] Step 4: Adjust the pH value:

[0029] Take out 10 grams of sample for PH test. If the PH value of cement soil admixture deviates from the standard value, it will affect the performance of the admixture in cement soil during subsequent use. The PH value of cement soil admixture needs to be adjusted. The ideal PH value range of cement soil admixture is between 6 and 8.

[0030] When the pH value is too high, dilute hydrochloric acid and buffer are added dropwise for neutralization until the cement soil admixture is adjusted to the ideal range;

[0031] When the pH value is too low, sodium hydroxide and buffer are added dropwise for neutralization until the cement soil admixture is adjusted to the ideal range;

[0032] Step 5 Quality Inspection:

[0033] Take out 30 grams of sample and mix it into cement soil for quality inspection. The inspection items mainly include setting time, crack resistance, anti-dispersion and corrosion resistance.

[0034] Step 6: Packaging

[0035] Seal the prepared cement soil admixture and store it in a ventilated, dry, shaded place, avoiding direct sunlight and high temperature environment.

[0036] Preferably, the setting time of the high-speed stirrer for premixing the raw materials in step one is 10 to 15 minutes; the setting speed of the high-speed stirrer for premixing the raw materials in step one is 1500 rpm to 2000 rpm; the setting time of the low-speed stirrer for premixing the raw materials in step one is 10 to 15 minutes; the setting speed of the low-speed stirrer for premixing the raw materials in step one is 100 rpm to 200 rpm.

[0037] Preferably, the quality inspection indicators of step five are setting time of 5 to 8 hours and crack resistance reaching P12.

[0038] Beneficial effects of the present invention:

[0039] The cement soil admixture with reduced permeability, compaction and anti-dispersion provided by the present invention can be added to cement soil according to the proportion and evenly stirred. Compared with the traditional coating method, the operation is simpler and more convenient, and the controllability is strong. The fiber connectivity in the admixture is strong, which can prevent the expansion of cracks. At the same time, the addition of slag powder and fly ash can also improve the performance of cement soil and improve its durability. The addition of waterproofing agent and expansion agent is helpful to the anti-permeability and volume stability of cement soil. The cement soil mixed with the admixture has better quality; the mixed cement soil has a fast coagulation speed, the crack resistance reaches P12, and the service life is extended by 3 to 8 years compared with traditional cement soil without leakage and cracking. The preparation method of the cement soil admixture with reduced permeability, compaction and anti-dispersion can prepare cement soil admixture with excellent performance and stable quality through raw material preparation, raw material mixing, preparation and pH adjustment to meet the needs of different projects. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the embodiments.

[0041] Example 1

[0042] The present invention provides an embodiment: a cement soil admixture for reducing permeability, compacting and resisting dispersion, the proportion of which is as follows in parts by weight:

[0043] Slag powder: 16 parts;

[0044] Fly ash: 16 parts;

[0045] Fiber: 10 parts;

[0046] Water reducing agent: 1 part;

[0047] Anti-dispersant: 1.5 parts;

[0048] Microsilica fume: 0.5 parts;

[0049] Waterproofing agent: 0.5 parts;

[0050] Bulking agent: 6 parts;

[0051] Preservatives: 0.7 parts.

[0052] Preferably, the slag powder is aluminum slag powder, steel slag powder or a combination of the two; the slag powder fineness standard is 450 mesh to 550 mesh.

[0053] Preferably, the fiber is one or a combination of carbon fiber, glass fiber, polypropylene fiber, steel fiber, and high-strength polyester fiber.

[0054] Preferably, the water reducer is aminobenzenesulfonic acid or polycarboxylic acid water reducer.

[0055] Preferably, the anti-dispersant is a polycarboxylic acid dispersant or a phosphate dispersant.

[0056] A method for preparing a cement soil admixture with reduced permeability, compaction and anti-dispersion, comprising the above-mentioned cement soil admixture with reduced permeability, compaction and anti-dispersion, and the steps are as follows;

[0057] Step 1: Raw material preparation:

[0058] The slag powder is measured, and the activity index, water demand ratio and fineness of the slag powder must meet the standards. Then the fiber is pretreated to make the fiber length basically between 0.2 and 6.0 mm.

[0059] Step 2 Premixing of raw materials:

[0060] According to the formula of admixture, weigh the required raw materials according to the weight ratio, put slag powder, fly ash, microsilica powder and fiber into the high-speed mixer, set the mixing parameters and perform dry mixing;

[0061] Put the water reducing agent, anti-dispersant, waterproofing agent, expansion agent and preservative into a low-speed mixer, add water, set the mixing parameters, and perform wet mixing to ensure that the water reducing agent, anti-dispersant, waterproofing agent, expansion agent and preservative are fully dissolved in water to form a solution;

[0062] Step 3: Preparation of admixture:

[0063] The solution was divided into 4 equal parts and added to the powder in a high-speed mixer at 45°C to ensure that the components of the cement soil admixture were fully dispersed and evenly mixed;

[0064] Step 4: Adjust the pH value:

[0065] Take out 10 grams of sample for PH test. If the PH value of cement soil admixture deviates from the standard value, it will affect the performance of the admixture in cement soil during subsequent use. The PH value of cement soil admixture needs to be adjusted. The ideal PH value range of cement soil admixture is between 6 and 8.

[0066] When the pH value is too high, dilute hydrochloric acid and buffer are added dropwise for neutralization until the cement soil admixture is adjusted to the ideal range;

[0067] When the pH value is too low, sodium hydroxide and buffer are added dropwise for neutralization until the cement soil admixture is adjusted to the ideal range;

[0068] Step 5 Quality Inspection:

[0069] Take out 30 grams of sample and mix it into cement soil for quality inspection. The inspection items mainly include setting time, crack resistance, anti-dispersion and corrosion resistance.

[0070] Step 6: Packaging

[0071] Seal the prepared cement soil admixture and store it in a ventilated, dry, shaded place, avoiding direct sunlight and high temperature environment.

[0072] Example 2

[0073] The present invention provides an embodiment: a cement soil admixture for reducing permeability, compacting and resisting dispersion, the proportion of which is as follows in parts by weight:

[0074] Slag powder: 18 parts;

[0075] Fly ash: 18 parts;

[0076] Fiber: 8 servings;

[0077] Water reducing agent: 1 part;

[0078] Anti-dispersant: 1 part;

[0079] Microsilica fume: 0.7 parts;

[0080] Waterproofing agent: 1 part;

[0081] Expanding agent: 7 parts;

[0082] Preservatives: 2 parts.

[0083] Preferably, the slag powder is aluminum slag powder, steel slag powder or a combination of the two; the slag powder fineness standard is 450 mesh to 550 mesh.

[0084] Preferably, the fiber is one or a combination of carbon fiber, glass fiber, polypropylene fiber, steel fiber, and high-strength polyester fiber.

[0085] Preferably, the water reducer is aminobenzenesulfonic acid or polycarboxylic acid water reducer.

[0086] Preferably, the anti-dispersant is a polycarboxylic acid dispersant or a phosphate dispersant.

[0087] A method for preparing a cement soil admixture with reduced permeability, compaction and anti-dispersion, comprising the above-mentioned cement soil admixture with reduced permeability, compaction and anti-dispersion, and the steps are as follows;

[0088] Step 1: Raw material preparation:

[0089] The slag powder is measured, and the activity index, water demand ratio and fineness of the slag powder must meet the standards. Then the fiber is pretreated to make the fiber length basically between 0.2 and 6.0 mm.

[0090] Step 2 Premixing of raw materials:

[0091] According to the formula of admixture, weigh the required raw materials according to the weight ratio, put slag powder, fly ash, microsilica powder and fiber into the high-speed mixer, set the mixing parameters and perform dry mixing;

[0092] Put the water reducing agent, anti-dispersant, waterproofing agent, expansion agent and preservative into a low-speed mixer, add water, set the mixing parameters, and perform wet mixing to ensure that the water reducing agent, anti-dispersant, waterproofing agent, expansion agent and preservative are fully dissolved in water to form a solution;

[0093] Step 3: Preparation of admixture:

[0094] The solution was divided into 5 equal parts and added to the powder in a high-speed mixer at 4°C to ensure that the components of the cement soil admixture were fully dispersed and evenly mixed;

[0095] Step 4: Adjust the pH value:

[0096] Take out 10 grams of sample for PH test. If the PH value of cement soil admixture deviates from the standard value, it will affect the performance of the admixture in cement soil during subsequent use. The PH value of cement soil admixture needs to be adjusted. The ideal PH value range of cement soil admixture is between 6 and 8.

[0097] When the pH value is too high, dilute hydrochloric acid and buffer are added dropwise for neutralization until the cement soil admixture is adjusted to the ideal range;

[0098] When the pH value is too low, sodium hydroxide and buffer are added dropwise for neutralization until the cement soil admixture is adjusted to the ideal range;

[0099] Step 5 Quality Inspection:

[0100] Take out 30 grams of sample and mix it into cement soil for quality inspection. The inspection items mainly include setting time, crack resistance, anti-dispersion and corrosion resistance.

[0101] Step 6: Packaging

[0102] Seal the prepared cement soil admixture and store it in a ventilated, dry, shaded place, avoiding direct sunlight and high temperature environment.

Claims

1. A cement soil admixture for reducing permeability, compacting and anti-dispersion, characterized in that: By weight, the ratio is as follows: Slag powder: 15-20 parts; Fly ash: 15-20 parts; Fiber: 8-10 parts; Water reducing agent: 1 to 1.5 parts; Anti-dispersant: 1.5 to 2 parts; Microsilica fume: 0.5-3 parts; Waterproofing agent: 0.5-3 parts; Expanding agent: 6-10 parts; Preservatives: 0.5 to 3 parts.

2. The cement soil admixture for reducing permeability, compacting and anti-dispersion according to claim 1, characterized in that: The slag powder is one of aluminum slag powder and steel slag powder or a combination of the two; the fineness standard of the slag powder is 450 mesh to 550 mesh.

3. The cement soil admixture for reducing permeability, compacting and anti-dispersion according to claim 1, characterized in that: The fiber is one or a combination of carbon fiber, glass fiber, polypropylene fiber, steel fiber, and high-strength polyester fiber.

4. The cement soil admixture for reducing permeability, compacting and anti-dispersion according to claim 1, characterized in that: The water reducing agent is one of aminobenzenesulfonic acid and polycarboxylic acid water reducing agent.

5. The cement soil admixture for reducing permeability, compacting and anti-dispersion according to claim 1, characterized in that: The anti-dispersant is a polycarboxylic acid dispersant or a phosphate dispersant.

6. A method for preparing a cement soil admixture with reduced permeability, compaction and anti-dispersion, characterized in that The method comprises the cement soil admixture for reducing permeability, compacting and resisting dispersion according to claims 1 to 5, and the steps are as follows: Step 1: Raw material preparation: The slag powder is measured, and the activity index, water demand ratio and fineness of the slag powder must meet the standards. Then the fiber is pretreated to make the fiber length basically between 0.2 and 6.0 mm. Step 2 Premixing of raw materials: According to the formula of admixture, weigh the required raw materials according to the weight ratio, put slag powder, fly ash, microsilica powder and fiber into the high-speed mixer, set the mixing parameters and perform dry mixing; Put the water reducing agent, anti-dispersant, waterproofing agent, expansion agent and preservative into a low-speed mixer, add water, set the mixing parameters, and perform wet mixing to ensure that the water reducing agent, anti-dispersant, waterproofing agent, expansion agent and preservative are fully dissolved in water to form a solution; Step 3: Preparation of admixture: Divide the solution into 4-5 equal portions and add them to the powder in a high-speed mixer at 40℃-45℃ to ensure that all components of the cement soil admixture are fully dispersed and evenly mixed; Step 4: Adjust the pH value: Take out 10 grams of sample for PH test. If the PH value of cement soil admixture deviates from the standard value, it will affect the performance of the admixture in cement soil during subsequent use. The PH value of cement soil admixture needs to be adjusted. The ideal PH value range of cement soil admixture is between 6 and 8. When the pH value is too high, dilute hydrochloric acid and buffer are added dropwise for neutralization until the cement soil admixture is adjusted to the ideal range; When the pH value is too low, sodium hydroxide and buffer are added dropwise for neutralization until the cement soil admixture is adjusted to the ideal range; Step 5 Quality Inspection: Take out 30 grams of sample and mix it into cement soil for quality inspection. The inspection items mainly include setting time, crack resistance, anti-dispersion and corrosion resistance. Step 6: Packaging Seal the prepared cement soil admixture and store it in a ventilated, dry, shaded place, avoiding direct sunlight and high temperature environment.

7. The method for preparing the cement soil admixture with reduced permeability, compaction and anti-dispersion according to claim 6, characterized in that: The setting time of the high-speed mixer for premixing the raw materials in step one is 10 to 15 minutes; the setting speed of the high-speed mixer for premixing the raw materials in step one is 1500 rpm to 2000 rpm; the setting time of the low-speed mixer for premixing the raw materials in step one is 10 to 15 minutes; the setting speed of the low-speed mixer for premixing the raw materials in step one is 100 rpm to 200 rpm.

8. The method for preparing the cement soil admixture with reduced permeability, compaction and anti-dispersion according to claim 6, characterized in that: The quality inspection indicators of step five are setting time of 5 to 8 hours and crack resistance reaching P12.