Heat-resistant concrete and preparation method thereof

Abstract

The invention discloses heat-resistant concrete and a preparation method thereof and belongs to the technical field of concrete. According to key points of the technical scheme, the heat-resistant concrete comprises the following components in parts by weight: cement, coarse aggregate, fine aggregate, ceramic ultrafine powder, mineral powder, fly ash, an early strength agent, a water reducing agent and water. The coarse aggregate refers to basalt gravel and barite gravel; the fine aggregate refers to grain slag; the early strength agent comprises calcium formate and sodium silicate; the waterreducing agent comprises an early strength polycarboxylic water reducer. By replacing medium sand with grain slag, the grain slag can be effectively utilized, the long-term strength of the concrete can be improved, the heat resistance of the concrete is improved by the basalt gravel, the barite gravel and the ceramic ultrafine powder, the defects that low early strength of the concrete is broughtby the grain slag and the water demand is large can be overcome through the early strength agent and the water reducing agent, the compactness of the concrete is improved, and the compressive strengthof the concrete is improved.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a heat-resistant concrete and a preparation method thereof. Background technique [0002] With the development of the construction industry and the increasing emphasis on the quality of construction projects, the quality and quantity of construction sand, which is one of the basic components of concrete and mortar, has an increasingly obvious impact on the construction industry. On the one hand, the market has higher and higher requirements for the quality of sand, and the quantity is increasing; on the other hand, natural sand resources that meet the quality requirements are becoming less and less. Limitation, looking for substitutes for natural sand is a current research hotspot. [0003] In recent years, my country's crude steel production has gradually increased. Every ton of crude steel produced will produce about 400kg of water slag. At present, water slag...

AI Technical Summary

Problems solved by technology

Water slag has many needle-point and flaky particles, and there are many internal pores, which leads to low crushing index of water slag and high water absorption

Water slag can reduce the heat of hydration of concrete and improve its durability; but there are also many disadvantages. For example, the addition of water slag will reduce the early strength of concrete and prolong the setting time. If more water slag is added to cement , the workability between water slag and cement will be poor, the water permeability will be greater, and the properties will be relatively unstable

[0006] Due to the high water absorption rate of water slag, it requires a lot of water, and the heat-resistant concrete is exposed to high temperature for a long time, and the water is easy to lose, resulting in the increase of the internal porosity of the concrete and the decrease of the loose strength of the structure; at the same time, excessive water consumption It will cause the residual water in the concrete to increase, and generate a large steam pressure at high temperature, resulting in concrete bursting and damage; therefore, it is necessary to reasonably control the water demand of heat-resistant concrete

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