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Self-mixed waterproof and anti-corrosion material in concrete, its preparation method and application

A technology for concrete inner and anti-corrosion materials, which is applied in the field of preparation of alkyl silanized silica fume powder, can solve the problems of high price and achieve the effects of low price, easy-to-obtain materials and simple production process

Active Publication Date: 2019-09-10
CCCC FOURTH HARBOR ENG INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Silicone hydrophobic powder has been used as a hydrophobic material in the production of dry-mixed mortar, but it is expensive, so it is necessary to further develop cheaper powder hydrophobic and waterproof materials

Method used

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  • Self-mixed waterproof and anti-corrosion material in concrete, its preparation method and application
  • Self-mixed waterproof and anti-corrosion material in concrete, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing a self-contained waterproof and anticorrosive material in concrete, comprising the following steps: (P1) 21.0 parts of alkyl silane, 35.0 parts of silica fume, 42.0 parts of water, 1.5 parts of calcium hydroxide, and fumed silica are selected according to parts by mass 0.5 part; alkyl silane is isobutyl triethoxy silane (one or more of iso-octyl triethoxy silane, n-octyl triethoxy silane, etc., or with isobutyl triethoxy silane can also be used Oxysilane used in combination).

[0033] (P2) With silica fume as the main component, add alkyl silane, and stir at low speed (500 revolutions per minute), so that the silica fume is completely infiltrated by the alkyl silane, to obtain mixture A;

[0034] (P3) Mix calcium hydroxide and fumed silica into water and stir to make calcium hydroxide and fumed silica suspension B;

[0035] (P4) Mix mixture A and suspension B, shear and emulsify at high speed (8000 revolutions per minute) in a high-speed disperser to ob...

Embodiment 2

[0039] A method for preparing concrete with a self-contained waterproof and anticorrosive material, including the following steps:

[0040] (P1) Select 21.0 parts of alkylsilane, 35.0 parts of silica fume, 41.9 parts of water, 2.0 parts of calcium hydroxide, and 0.1 part of fumed silica according to parts by mass; alkylsilane is isooctyltriethoxysilane.

[0041] (P2) With silica fume as the main component, add alkyl silane, and stir at low speed (500 revolutions per minute), so that the silica fume is completely infiltrated by the alkyl silane, to obtain mixture A;

[0042] (P3) Mix calcium hydroxide and fumed silica into water and stir to make calcium hydroxide and fumed silica suspension B;

[0043] (P4) Mix mixture A and suspension B, shear and emulsify at high speed (8000 revolutions per minute) in a high-speed disperser to obtain a compound type "water-in-oil-in-water" (W / O / W) Smooth and stable paste-like emulsion C with structure;

[0044] (P5) The silica fume in the paste emuls...

Embodiment 3

[0047] A method for preparing concrete with a self-contained waterproof and anticorrosive material, including the following steps:

[0048] (P1) 21.0 parts of alkylsilane, 35.0 parts of silica fume, 42.9 parts of water, 0.1 part of calcium hydroxide, and 1.0 part of fumed silica are selected according to parts by mass; the alkylsilane is n-octyltriethoxysilane.

[0049] (P2) With silica fume as the main component, add alkyl silane, and stir at low speed (500 revolutions per minute), so that the silica fume is completely infiltrated by the alkyl silane, to obtain mixture A;

[0050] (P3) Mix calcium hydroxide and fumed silica into water and stir to make calcium hydroxide and fumed silica suspension B;

[0051] (P4) Mix mixture A and suspension B, shear and emulsify at high speed (8000 revolutions per minute) in a high-speed disperser to obtain a compound type "water-in-oil-in-water" (W / O / W) Smooth and stable paste-like emulsion C with structure;

[0052] (P5) The silica fume in the pas...

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Abstract

The invention discloses a self-waterproof corrosion-resistant material for being doped in concrete. The material is alkyl silanized silicon ash powder which is prepared by well mixing a mixture A with turbid liquid B, performing high-speed dispersion, cutting and emulsifying to obtain a pasty emulsion and dewatering the pasty emulsion, the mixture A is prepared from alkyl silane and silicon ash according to a mass ratio of (2.8-3.2):(4.5-5.5), the turbid liquid B is mixed turbid liquid containing calcium hydroxide and water, and a mass ratio of the mixture A to the turbid liquid B is (50-60):(40-50). The material prepared by a method is simple in preparation process, environment-friendly during preparation and low in cost, has large specific surface area, excellent hydrophobic performance, small adding amount, obvious surface beading effect and high durability, has little impact on strength of mortar and concrete, can endow waterproof mortar and self-waterproof corrosion-resistant concrete with excellent waterproofness and can fundamentally guarantee durability of buildings.

Description

Technical field [0001] The invention relates to the technical field of survival processing of waterproof powder materials, in particular to a preparation method of alkylsilanated silica fume fine powder with hydrophobic characteristics after surface modification of alkylsilane. [0002] technical background [0003] Silica fume is dust recovered from the flue gas of metal silicon or ferrosilicon alloy smelting. The average particle size of silica fume is 0.1-0.3 microns, and the specific surface area is 15000-28000 m2 / kg. Its main component is silica, with a content of 75% to 96%. Impurities are alumina, sodium oxide, calcium oxide, magnesium oxide, iron oxide, activated carbon, etc. [0004] At present, the use of silica fume at home and abroad is mainly in the concrete industry, refractory additives, cement admixtures, etc., with a wide range of applications. From the concrete industry, it has been widely used in seaport projects, hydropower and water conservancy projects, indus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B111/27C04B111/20
Inventor 岑文杰王胜年熊建波范志宏
Owner CCCC FOURTH HARBOR ENG INST