Heat-resistant concrete and preparation method thereof

A technology of heat-resistant concrete and ceramic fibers, applied in the field of building materials, can solve the problems that ordinary concrete cannot withstand high temperature, increase cracks, and cannot be used in high temperature and high humidity environments.

Active Publication Date: 2021-09-10
北京民佳混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary concrete generally only has requirements for compressive strength, and when the building is in a high-temperature environment (for example, the blast furnace and coke oven made of concrete will generate a temperature of 200-700°C when it is working), because ordinary concrete does not High temperature resistance, so it cannot be used in high temperature environment
The main reason why ordinary concrete is not resistant to high temperature is: calcium hydroxide in concrete and limestone coarse aggregate will decompose at high temperature, while quartz sand will undergo crystal transformation and volume expansion at high temperature, and cement The thermal expansion coefficients of stone and aggregate are different, resulting in the increase of cracks and the decrease of strength in ordinary concrete under high temperature, which seriously affects the life of buildings
[0003] At present, heat-resistant concrete is usually made of aluminate cement as the cementitious material, high-alumina bricks, broken magnesia bricks, etc. as aggregates, mixed with chemical admixtures and mineral admixtures; However, due to the large heat of hydration of aluminate cement, the long-term strength and other properties tend to decrease, and the strength of high-alumina bricks and crushed magnesia bricks is low, resulting in the compressive strength of this heat-resistant concrete is generally only C20 -C40 makes it impossible to apply to long-term load-bearing structures and projects in high-temperature and high-humidity environments, which limits its application range

Method used

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  • Heat-resistant concrete and preparation method thereof
  • Heat-resistant concrete and preparation method thereof
  • Heat-resistant concrete and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0045] Preparation example of electroless copper plating solution

[0046] All the raw materials in the preparation examples can be obtained commercially.

[0047] The electroless copper plating solution is prepared by the following method: take 20kg copper sulfate pentahydrate, 45kg disodium ethylenediaminetetraacetic acid, 12kg potassium sodium tartrate, 12kg formaldehyde, 13kg2,2'-bipyridine, mix them and add ammonia water to adjust the pH For 12, the electroless copper plating solution is obtained.

[0048] Preparation example of silica modified liquid

[0049] The raw materials in the following preparation examples can all be obtained from the market, wherein ethyl orthosilicate is selected from industrial grade ethyl orthosilicate with a silicon dioxide content of 40% provided by Shandong Yushuo Chemical Co., Ltd.

preparation example 1

[0051] The silicon dioxide modified solution is prepared by the following method: mix octadecyltrimethoxysilane with an aqueous solution of ethanol with a volume fraction of 50% according to a ratio of 1:50 by weight to obtain an ethanol solution of a silane coupling agent ;

[0052] Cetyltrimethylammonium bromide and water are mixed according to the ratio of 1:100, and the aqueous solution of surfactant is obtained;

[0053] Take 8kg of ethanol solution of silane coupling agent, 4kg of aqueous solution of surfactant and 1kg of tetraethyl orthosilicate, and mix them uniformly to obtain silicon dioxide modified solution.

preparation example 2

[0055] The difference between this preparation example and the preparation example 1 of the silica modified solution is that the amount of the ethanol solution of the silane coupling agent is 9 kg, and the amount of the aqueous solution of the surfactant is 5 kg.

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Abstract

The invention relates to the field of building materials, and particularly discloses heat-resistant concrete and a preparation method thereof. The heat-resistant concrete is prepared from the following components in parts by weight: 200 to 220 parts of Portland cement, 500 to 520 parts of basalt macadam, 350 to 370 parts of sand, 70 to 90 parts of admixture, 30 to 40 parts of filler, 15 to 20 parts of modified copper-plated ceramic fiber, 6 to 8 parts of water reducing agent and 80 to 100 parts of water, wherein the modified copper-plated ceramic fiber is obtained by performing chemical copper plating on ceramic fiber and coating the ceramic fiber with a silicon dioxide layer. The filler is formed by mixing montmorillonite powder, expandable graphite and sepiolite porous ceramic according to the weight ratio of (1-3):(1-3):5. The heat-resistant concrete can be used for buildings under a high-temperature condition for a long time, and has the advantages of high compressive strength and good heat resistance.

Description

technical field [0001] The application relates to the field of building materials, more specifically, it relates to a heat-resistant concrete and a preparation method thereof. Background technique [0002] Ordinary concrete refers to cement as the main cementitious material, sand and stone as aggregates, when necessary, chemical admixtures and mineral admixtures are added, mixed in appropriate proportions, mixed with water, densely formed and cured. Artificial stone. Ordinary concrete generally only has requirements for compressive strength, and when the building is in a high-temperature environment (for example, the blast furnace and coke oven made of concrete will generate a temperature of 200-700°C when it is working), because ordinary concrete does not It is resistant to high temperature, so it cannot be used in high temperature environment. The main reason why ordinary concrete is not resistant to high temperature is: calcium hydroxide in concrete and limestone coarse...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C04B28/04C04B20/12C04B14/46
CPCC04B28/04C04B20/12C04B14/46C04B2201/50C04B2111/28C04B14/14C04B14/06C04B2103/302C04B14/104C04B14/024C04B18/027C04B20/1062C04B20/1066Y02W30/91
Inventor曹春龙
Owner北京民佳混凝土有限公司