A kind of anti-cracking and waterproofing agent for well shaft concrete based on freezing method

An anti-crack waterproofing agent and a technology for construction wells, which are applied in the field of concrete admixtures, can solve the problems of high viscosity of high-strength concrete, the time of concrete cracking will be advanced, and construction is difficult, so as to achieve high hourly strength, improve compactness, and protect the environment. Effect

Active Publication Date: 2016-03-23
山东建科建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, silica fume must be used to prepare high-strength concrete. However, when the addition of silica fume in concrete is increased from 5% to 10%, the early hydration heat of concrete will increase by 15% to 20%, and the cracking time of concrete will be advanced by 1 / 2 or so
On the other hand, the addition of silica fume will increase the viscosity of high-strength concrete, which will bring great difficulties to construction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] An anti-cracking waterproofing agent for well shaft concrete based on the freezing method, prepared according to the mass ratio of the following components:

[0044] Polycarboxylate high-performance water reducer 4%;

[0045] VAE vinyl acetate-ethylene copolymerized redispersible rubber powder 2%;

[0046] Aluminum sulfate clinker 15%;

[0047] Burnt gems 15%;

[0048] Fluorogypsum 30%;

[0049] Ultrafine slag powder 34%;

[0050] The preparation method of this embodiment is to grind evenly in a ball mill according to the specified mass ratio.

[0051] C50 concrete was prepared with an addition of 12%, and the test results showed that:

[0052] Working performance: the slump is 220mm, and the change value of slump in 60 minutes is 10mm;

[0053] Concrete strength: 8h is 1.5MPa; 24h is 20.6MPa, reaching 41.2% of the design strength; 3d is 44.7MPa, reaching 89.4% of the design strength; 7d is 51.7MPa, reaching 103.4% of the design strength; 28d is 63.0MPa, reaching...

Embodiment 2

[0060] An anti-cracking waterproofing agent for well shaft concrete based on the freezing method, prepared according to the mass ratio of the following components:

[0061] Polycarboxylate high-performance water reducer 4%;

[0062] VAE vinyl acetate-ethylene copolymerized redispersible rubber powder 4%;

[0063] Aluminum sulfate clinker 15%;

[0064] Burnt gems 15%;

[0065] Fluorogypsum 30%;

[0066] Ultrafine slag powder 32%:

[0067] The preparation method of this embodiment is to grind evenly in a ball mill according to the specified mass ratio.

[0068] The addition amount is 12%, and C50 concrete is prepared, and the water absorption ratio of concrete is tested according to the test method specified in "Mortar, Concrete Waterproofing Agent" JC474-2008, compared with Example 1, and the results are as follows:

[0069] The water absorption ratio of the concrete in Example 2 is 54.1%, and the water absorption ratio of the concrete in Example 1 is 32.0%. The ratio of...

Embodiment 3

[0071] An anti-cracking waterproofing agent for well shaft concrete based on the freezing method, prepared according to the mass ratio of the following components:

[0072] Polycarboxylate high-performance water reducer 4%;

[0073] VAE vinyl acetate-ethylene copolymerized redispersible rubber powder 2%;

[0074] Aluminum sulfate clinker 20%;

[0075] Burnt gems 20%;

[0076] Fluorogypsum 40%;

[0077] Ultrafine slag powder 14%;

[0078] The preparation method of this embodiment is to grind evenly in a ball mill according to the specified mass ratio.

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Abstract

The invention discloses a concrete anti-cracking waterproof agent for constructing a well bore based on a freezing method. The concrete anti-cracking waterproof agent comprises the components in percentage by weight: 3-5% of high-performance polycarboxylic acid water reducing agent, 1-4% of redispersable rubber powder, 10-30% of aluminum sulfate clinker, 10-30% of flint clay, 20-40% of fluorine gypsum and 10-55% of superfine slag powder. All the components are added according to the proportions and uniformly ground in a ball grinder. The concrete anti-cracking waterproof agent breaks through the convention of using silica fume in a process of preparing high-strength concrete and can ensure the construction of the well bore by using the freezing method, and the concrete is rapid in strength development and free of cracking, so that the anti-permeability and waterproof aims are achieved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an anti-cracking and waterproofing agent for wellbore concrete based on the freezing method. Background technique [0002] The shaft of the new coal mine is constructed by the freezing method, and the double-layer reinforced concrete plastic interlayer composite shaft wall structure is mainly used. According to the design requirements, the inner well wall is the main body of the permanent well wall, which acts as a water seal and bears all the water pressure. In recent years, with the increase of the thickness of the topsoil layer that the frozen shaft passes through, some extra-thick topsoil layers have reached more than 800m. The concrete in the structure is in a state of multidirectional stress under the joint action of the force and the supporting force of the wall tube. The surface soil aquifer water directly acts on the reinforced concrete well wall, and the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B22/14C04B103/65
Inventor 鲁统卫王谦王勇威杨少伟王开宇
Owner 山东建科建筑材料有限公司
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