High-strength heat-resistant concrete and preparation method thereof

Abstract

The invention discloses a high-strength heat-resistant concrete and a preparation method thereof. The high-strength heat-resistant concrete comprises the following components in parts by weight: 300 to 350 parts of cement, 800 to 1100 parts of coarse aggregates, 400 to 500 parts of fine aggregates, 80 to 100 parts of coal ash, 5 to 10 parts of water reduction agent, 100 to 150 parts of mineral powder, 700 to 900 parts of gravels, 20 to 40 parts of early strengthening agent, 180 to 200 parts of water, 10 to 20 parts of steel fibers, and 5 to 10 parts of antirust agent; the coarse aggregates areprepared by mixing ceramic micro powder, blast furnace slag and basalt in a weight ratio of 1: (10 to 15): (30 to 50); and the fine aggregates are prepared by mixing 20 to 40 parts of silica fume, 10to 20 parts of expanded perlite and 15 to 30 parts of sintered magnesite. The high-strength heat-resistant concrete has the advantages of good compactness, high strength, high heat resistance, good workability and pumpability.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to a high-strength heat-resistant concrete and a preparation method thereof. Background technique [0002] Heat-resistant concrete is a special concrete that can withstand high temperature (above 200°C) for a long time and maintain the required physical and mechanical properties under high temperature. Heat-resistant concrete is mainly used in industrial kiln foundations, shells, chimneys, and atomic energy pressure vessels. It not only withstands high temperatures for a long time, but also withstands repeated temperature changes of heating and cooling. Ordinary traditional concrete is a cementitious material composed of cement. Sand and stone are used as aggregates, and artificial stone is prepared by adding admixtures and admixtures. When the ambient temperature exceeds 300 ° C, its strength drops sharply. This is Because the hydration products in cemen...

AI Technical Summary

Problems solved by technology

Therefore, ordinary concrete cannot meet the requirements of these projects, and heat-resistant concrete must be used

[0003] At present, high-temperature-resistant concrete usually uses cement or water glass as the cementitious material, and uses broken magnesia bricks, sintered magnesia, refractory broken bricks, clay clinker, etc. Low, usually lower than C20; at the same time, broken refractory bricks, broken magnesia bricks, etc. are coarse aggregates, with large porosity and strong water absorption. If the water consumption is increased, its strength will also be reduced

In addition, the residual flexural strength of heat-resistant concrete is generally not high after high temperature. Generally, it is about 50-70% of the design strength grade in the range of 200-500°C, and about 35-45% of the design strength grade in the range of 500-900°C. % or so, is detrimental to its durability performance

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