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Super-repellent cement rock modifier and its preparation method and mudstone improvement method

A technology of cement rock and modifier, applied in the direction of coating, etc., can solve the problems of slow ion exchange rate, long time, poor anti-seepage effect and durability, and achieve improved improvement effect, good elasticity and high wear resistance Effect

Active Publication Date: 2020-11-13
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional cementitious materials are mainly through Si in lime or cement 4+ 、Al 3+ and Fe 3+ Plasma hydration reaction forms a layer of cementitious material on the surface of mudstone to increase the strength and anti-seepage performance of mudstone; although traditional cementitious materials are cheap and fast in consolidation, their anti-seepage effect and durability are poor
Alkali-active materials are mainly through the alkaline substances in the material and the Si in the rock and soil mass. 4 + 、Al 3+ Plasma is exchanged to form a gelled substance and further develop into a small network structure, which improves the internal structure and anti-seepage performance of rock and soil; but the ion exchange rate between alkali active materials and rock and soil is slow and takes a long time

Method used

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  • Super-repellent cement rock modifier and its preparation method and mudstone improvement method
  • Super-repellent cement rock modifier and its preparation method and mudstone improvement method
  • Super-repellent cement rock modifier and its preparation method and mudstone improvement method

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Effect test

Embodiment 1

[0028] The preparation method of super-repellent cement rock modifier, concretely carry out according to the following steps:

[0029] Step S1, according to the following parts by mass: 1 part of calcium oxide, 10 parts of potassium chloride, 0.3 part of polyvinylidene fluoride, 0.6 part of dimethylformamide or N-methylpyrrolidone, and weigh the raw materials;

[0030] Step S2, at 20°C, mix the weighed polyvinylidene fluoride (PVDF) with dimethylformamide (DMF), or mix the weighed polyvinylidene fluoride (PVDF) with N-methylpyrrolidone (NMP ) were mixed and stirred for 45 minutes until the mixture became a translucent solution, wherein the mass ratio of polyvinylidene fluoride to dimethylformamide was 1:2;

[0031] Step S3, dissolving the weighed powdered calcium oxide in water and stirring for 45 minutes to obtain a calcium hydroxide solution with a mass concentration of 8%; dissolving the weighed potassium chloride powder in water and stirring evenly to obtain a mass concent...

Embodiment 2

[0034] The preparation method of super-repellent cement rock modifier, concretely carry out according to the following steps:

[0035] Step S1, according to the following parts by mass: 8 parts of calcium oxide, 3 parts of potassium chloride, 1 part of polyvinylidene fluoride, 2 parts of dimethylformamide or N-methylpyrrolidone, and weigh the raw materials;

[0036] Step S2, at 30°C, mix the weighed polyvinylidene fluoride (PVDF) with dimethylformamide (DMF), or mix the weighed polyvinylidene fluoride (PVDF) with N-methylpyrrolidone (NMP ) were mixed and stirred for 40 minutes until the mixture became a translucent solution, wherein the mass ratio of polyvinylidene fluoride to dimethylformamide was 1:2;

[0037]Step S3, dissolve the weighed powdered calcium oxide in water and stir for 35 minutes to obtain a calcium hydroxide solution with a mass concentration of 5%; dissolve the weighed potassium chloride powder in water and stir evenly to obtain a mass concentration of 5% po...

Embodiment 3

[0040] The preparation method of super-repellent cement rock modifier, concretely carry out according to the following steps:

[0041] Step S1, according to the following mass parts: 5 parts of calcium oxide, 6 parts of potassium chloride, 0.7 parts of polyvinylidene fluoride, 1.4 parts of dimethylformamide or N-methylpyrrolidone, and weigh the raw materials;

[0042] Step S2, at 45°C, mix the weighed polyvinylidene fluoride (PVDF) with dimethylformamide (DMF), or mix the weighed polyvinylidene fluoride (PVDF) with N-methylpyrrolidone (NMP ) and stir for 30 minutes until the mixture becomes a translucent solution, wherein the mass ratio of polyvinylidene fluoride to dimethylformamide is 1:2;

[0043] Step S3, dissolving the weighed powdered calcium oxide in water and stirring for 30 minutes to obtain a calcium hydroxide solution with a mass concentration of 1%; dissolving the weighed potassium chloride powder in water and stirring evenly to obtain a mass concentration of 1% p...

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Abstract

The invention discloses a superhydrophobic mudstone modifier, a preparation method thereof and a mudstone improvement method. The superhydrophobic mudstone modifier comprises the following raw materials in parts by weight: 1-8 parts of calcium oxide, 3-10 parts of potassium chloride, 0.3-1.0 part of polyvinylidene fluoride, and 0.6-2.0 parts of dimethyl formamide or N-methyl pyrrolidone, wherein the mass ratio of polyvinylidene fluoride to dimethyl formamide is 1:2. Polyvinylidene fluoride has good film-forming properties. After polymer film-forming, external hydrophobic groups can prevent water molecules from penetrating into mudstone and improve the permeability of carbonaceous mudstone. When the carbonaceous mudstone disintegrates in the presence of water, a polyvinylidene fluoride membrane is stressed and a binding force is generated between the polyvinylidene fluoride membrane and the carbonaceous mudstone particles, the disintegration of the carbonaceous mudstone is suppressed, the development of cracks is prevented, and the strengthening effect of the carbonaceous mudstone is improved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to a super-repellent cement rock modifier, a preparation method thereof and a mudstone improvement method. The super-repellent cement rock modifier is used for mudstone improvement. Background technique [0002] Mudstone includes weak rock bodies such as carbonaceous mudstone, sandy mudstone and shale. Due to the unique physical and chemical properties of mudstone, it is extremely sensitive to environmental factors such as temperature, humidity, and stress. Especially when the humidity conditions change, the properties and states of mudstone will change greatly, resulting in hydration expansion, crushing expansion, Reduced strength. However, mudstone has been widely used in embankment engineering as embankment filler because of its wide distribution and easy access to raw materials. Engineering practice shows that mudstone is a special weak rock mass with excellent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/16C09D7/61
Inventor 曾铃查焕奕刘杰付宏渊陈彩营
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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