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Bentonite anti-seepage and anti-salt corrosion cement concrete additive

The technology of cement concrete and bentonite is applied in the field of anti-seepage and anti-salt corrosion cement concrete additives, which can solve the problems of high engineering cost and high maintenance cost, and achieve the effects of large supply of water reducing agent, low cost and improvement of engineering quality.

Active Publication Date: 2014-08-06
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have led to high engineering costs and high maintenance costs to varying degrees.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Commercially available modified sodium-based bentonite powder (fineness 80μm sieve <12%, montmorillonite content 92.5%), chimney dust "silica fume" from the crystal silicon factory and naphthalene-based water reducer powder were selected as raw materials, according to the modified Sodium-based bentonite powder: silica fume: naphthalene-based water reducer = 100:5:1.6 mass ratio ingredients, mixed evenly, to make bentonite anti-seepage and anti-salt erosion cement concrete additive.

[0019] Mix this additive into 42.5 grade cement, homogenize it, the dosage is equivalent to 5% of the weight of cement, and use it in the construction of canals. After 2 years of observation, no signs of leakage and salt corrosion have been found.

Embodiment 2

[0021] In the suspension during the purification and modification of bentonite, a polycarboxylate superplasticizer accounting for 0.3% of the mass of bentonite is added to obtain a dry-based modified bentonite (montmorillonite content of 91.3% ), and choose silica as the potential active carbon dioxide raw material, according to the mass ratio of modified bentonite (bentonite 100+water reducer 0.3) 100.3: silica 25, grind it into a fine powder with a fineness of <12%, that is, bentonite anti-corrosion Penetration resistance salt corrosion cement concrete additive.

[0022] Mix this additive into 52.5 grade cement and homogenize it. The dosage is equivalent to 3% of the weight of the cement. It is used in the construction of coastal dikes and weirs. After 2 years of observation, no signs of leakage and salt corrosion have been found.

Embodiment 3

[0024] Select commercially available organic modified bentonite powder (fineness 80μm sieve < 12% montmorillonite content 91%), pre-industrial product silicon powder (commonly known as white carbon black) and powdered melamine water reducer, according to organic modification Bentonite powder: silicon powder: water reducer = 100:10::0.8 mass ratio batching, homogenization, to make bentonite anti-seepage and anti-salt erosion water concrete additive.

[0025] This additive was added to clinker powder instead of 5% slag powder, blended into 42.5 grade cement, and used for culvert construction. After 2 years of observation, no signs of leakage and salt corrosion were found.

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PUM

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Abstract

The invention relates to a bentonite anti-seepage and anti-salt corrosion cement concrete additive. The anti-seepage and anti-salt corrosion cement concrete additive is prepared by mixing modified bentonite and a conditioning agent, wherein the conditioning agent is a mixture of active silicon dioxide power and a water reducing agent, and the mass ratio of all the components is as follows: modified bentonite: active silicon dioxide powder: water reducing agent=100: (3-30): (0.3-3.5). The anti-seepage and anti-salt corrosion cement concrete additive is used for preparing cement and concrete. The anti-seepage and anti-salt corrosion cement concrete additive provided by the invention has the advantages of large geological reserves of the used raw material bentonite, wide distribution range, wide range of sources, low cost, good economy and simple and convenient using method.

Description

technical field [0001] The invention relates to a cement concrete additive, in particular to an anti-seepage and anti-salt erosion cement concrete additive. Background technique [0002] Cement is the most widely used hydraulic cementitious material. It is the cementing material of concrete. After hardening, it leaves a large number of capillary channels and dry shrinkage and thermal expansion micro-cracks. These micro-channels and cracks provide protection for leakage and salt corrosion. The path creates conditions that lead to leakage and salt corrosion damage of cement or concrete products or concrete works, especially in dams, tunnels, culverts, canals, pools, towers, dikes, wharves and other projects. become the biggest engineering technical problem. [0003] The current technical methods to solve the leakage and salt corrosion problems of cement concrete projects can be summarized into four categories: one is to set up one or more anti-seepage isolation layers; The t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/18C04B24/12C04B22/06C04B103/60
Inventor 尹无忌
Owner 长沙紫宸科技开发有限公司
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