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Bentonite impervious salt-corrosion-resistant cement concrete additive

A technology of cement additives and bentonite, applied in the field of impermeable cement additives, can solve the problems of high maintenance costs and high engineering costs, and achieve the effect of large supply of water reducing agent, low cost, and ease of construction technical difficulty

Inactive Publication Date: 2016-01-27
王晓伟
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  • Summary
  • Abstract
  • Description
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  • 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 ash "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 anti-seepage cement 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 in the bentonite purification and modification process, add about 0.3% polycarboxylate water-reducer of bentonite mass to obtain dry-base modified bentonite (montmorillonite content 91.3%) containing water-reducer at the same time ), select silica as the potential active carbon dioxide raw material, and mix according to the mass ratio of modified bentonite (bentonite 100+water reducer 0.3) 100.3: silica 25, and grind it into a fine powder with a fineness of <12% to obtain impermeability cement additives.

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

Embodiment 3

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

An impervious cement additive is prepared by mixing modified bentonite and a texturizer. The texturizer is a mixture of activated silicon dioxide powder and a water reducing agent. The mass ratio of the modified bentonite to the activated silicon dioxide powder to the water reducing agent is 100 to 3-30 to 0.3-0.5. The impervious cement additive is used for preparing cement and concrete. The raw material bentonite used in the additive is large in geological reserve, wide in distributive area, wide in source, low in cost and good in economical efficiency. The use method is simple and convenient to use.

Description

technical field [0001] The invention relates to a cement concrete additive, in particular to an anti-seepage cement 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 third is to add a large amount o...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B24/12C04B24/16C04B14/10C04B103/65
Inventor 王晓伟
Owner 王晓伟
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