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A kind of cement paste and preparation method thereof

A technology of cement slurry and cement, applied in the field of cement paste and its preparation, can solve the problems of increased complexity, difficulty in achieving the purpose of plugging, large plasticity, etc., and achieve the effect of reduced complexity and simple construction process

Active Publication Date: 2016-05-18
SINOHYDRO FOUND ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary cement paste has a large plasticity and does not have water resistance. Under water, especially under dynamic water conditions, ordinary paste is easily washed away by water flow, and it is difficult to achieve the purpose of plugging
In practical application, there are other deficiencies in cement paste, that is, the larger shear yield strength of quick-setting paste is achieved by adding more clay, bentonite, fly ash and other admixtures, so the bentonite of paste The amount of bentonite is large, and there is a process of swelling and high-speed mixing of bentonite. In actual construction, there is a large pressure in the pulping process of bentonite slurry, which increases the complexity of the construction process and construction; in addition, aluminate cement and ordinary silicon cement Mixing, the setting time is sensitive to factors such as temperature, mixing uniformity, and mixing amount, and the reaction time is difficult to control accurately, which is not conducive to the plugging of formations with large leakage volume and dynamic water flow
Therefore the operability and the grouting effect of the cement paste in the prior art all need to be improved

Method used

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  • A kind of cement paste and preparation method thereof
  • A kind of cement paste and preparation method thereof
  • A kind of cement paste and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Equipment, raw materials and process

[0025] Equipment: conventional double barrel mixer and 3SNS pump;

[0026] Raw materials: additives (composed of xanthan gum tackifier and polycarboxylate superplasticizer); water; cement;

[0027] Process: pure pressure type or orifice circulation type, the grouting process does not need to be adjusted.

[0028] 2. Preparation method

[0029] 1) Dissolve a bag of 0.2kg of admixture (composed of xanthan gum tackifier and polycarboxylate superplasticizer) in 10L of water to form an admixture solution, and then add it to the lower barrel of the double-barrel low-speed mixer;

[0030] 2) Mix and stir cement and water with a water-cement ratio of 0.45:1 to prepare 180L of cement slurry and put it into the upper barrel of a double-barrel low-speed mixer; or prepare pure water with a water-cement ratio of 0.45:1 Put 180L of mud into the upper barrel of the double-barrel low-speed mixer;

[0031] 3) Turn on the mixer, add the 180L ...

Embodiment 2

[0034] 1. Equipment, raw materials and process

[0035] Equipment: conventional double barrel mixer and 3SNS pump;

[0036] Raw materials: admixture (composed of welan gum tackifier and polycarboxylate superplasticizer); water; cement;

[0037] Process: pure pressure type or orifice circulation type, the grouting process does not need to be adjusted.

[0038] 2. Preparation method

[0039] 1) Dissolve a bag of 0.4kg of admixture (composed of welan gum tackifier and polycarboxylate superplasticizer) in 10L of water to form an admixture solution, and then add it to the lower barrel of the double-barrel low-speed mixer;

[0040] 2) Mix and stir cement and water with a water-cement ratio of 0.5:1 to prepare 170L of cement slurry and put it into the upper barrel of a double-barrel low-speed mixer; or prepare pure water with a water-cement ratio of 0.5:1 Put 170L of mud into the upper barrel of the double-barrel low-speed mixer;

[0041] 3) Turn on the mixer, add the 170L cement...

Embodiment 3

[0044] 1. Equipment, raw materials and process

[0045] Equipment: conventional double barrel mixer and 3SNS pump;

[0046] Raw materials: additives (composed of xanthan gum tackifier, welan gum tackifier and polycarboxylate superplasticizer); water; cement;

[0047] Process: pure pressure type or orifice circulation type, the grouting process does not need to be adjusted.

[0048] 2. Preparation method

[0049] 1) Dissolve a bag of 0.8kg admixture (consisting of xanthan gum tackifier, welan gum tackifier and polycarboxylate superplasticizer) in 10L of water to form an admixture solution, and then add it to the double barrel at low speed in the lower barrel of the mixer;

[0050] 2) Mix and stir cement and water with a water-cement ratio of 0.45:1 to prepare 190L of cement slurry and put it into the upper barrel of a double-barrel low-speed mixer; or prepare pure water with a water-cement ratio of 0.45:1 Put 190L of mud into the upper barrel of the double-barrel low-speed ...

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Abstract

The invention discloses cement paste comprising cement, water and an admixture, wherein the admixture comprises a biogum tackifier and a polycarboxylate superplasticizer. The invention simultaneously discloses a preparation method of the cement paste. The method comprises the following processing steps of: 1) adding and dissolving the admixture containing the iogum tackifier and the polycarboxylate superplasticizer in the first batch of water, so as to form an admixture solution; 2) mixing the cement with second batch of water, and agitating, so as to prepare cement slurry; 3) mixing the cement slurry with the admixture solution, agitating and evenly mixing to obtain the cement paste. The cement paste disclosed by the invention has excellent performances of high thixotropy and water resistance, and is suitable for grouting in macropore stratums such as karst holes, wide fissures of rock mass and rockfills.

Description

technical field [0001] The invention relates to the technical field of grouting, in particular to a cement paste for wide crack grouting and a preparation method thereof. Background technique [0002] Grouting in wide cracks is one of the most common technical problems in grouting construction. In engineering practice, wide cracks are often accompanied by moving water, which has a great influence on the grouting effect and cost. In order to solve this problem, in the past, ordinary cement paste was often used for treatment, that is, a paste slurry with a low water-cement ratio formed by mixing a large amount of clay, bentonite, fly ash and other admixtures and a small amount of admixture into the cement paste. , whose basic feature is that the shear yield strength of the slurry is greater than the influence of its own gravity. However, ordinary cement paste has relatively high plasticity and no water resistance. Under water, especially under dynamic water conditions, ordin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B24/26
Inventor 肖恩尚孙亮李富王俊成苏迎春刘勇
Owner SINOHYDRO FOUND ENG
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