Concrete at strength grade of C40 for steel reinforced concrete composite structure

Abstract

The invention discloses concrete at a strength grade of C40 for a steel reinforced concrete composite structure. Cement:fine aggregate:coarse aggregate:water:super plasticizer:antifoaming agent:silica fume:fly ash:composite activator (kg / m<3>) is 300:740:1,089:155:4:1:30:70:2. A preparation method comprises the following steps of uniformly mixing the polycarboxylate type super plasticizer and the composite activator into weighed water to obtain a mixture, sequentially mixing the fine aggregate and 1 / 3 of the total amount of the mixture into a stirrer according to a weight ratio, adding the course aggregate and 1 / 3 of the total amount of the mixture, performing stirring, adding the cement, the silica fume and the fly ash, performing stirring, adding the antifoaming agent and the residual mixture, and performing stirring and discharging. According to the concrete, bonding performance between structural steel and the concrete can be remarkably improved in a natural state, and respective mechanical performance and cooperative working performance of the steel and the concrete can be effectively utilized, thereby greatly improving bearing capacity and application performance of a structural component and improving durability of the structure.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a high-performance concrete with a strength grade of C40 for steel-concrete composite structures. Background technique [0002] The invention of Portland cement in 1824 led to the rapid development of concrete technology. Its consumption is large and its scope of application ranks the highest in the world. Although concrete is a traditional man-made building material, because of its irreplaceable advantages (abundant raw materials, simple production process, high cost performance, etc.) and the continuous progress of concrete material science and technology, concrete has become the main body of civil engineering materials. , It will also be one of the indispensable main materials in future civil engineering and national construction. At the same time, with the continuous expansion of the city, the continuous increase of the population, the continuous increase of the lan...

AI Technical Summary

Problems solved by technology

The above-mentioned strength grades of concrete can significantly improve the bonding performance between steel and high-strength or ultra-high-strength concrete, and improve the durability of the structure. High-strength high-performance or ultra-high-strength high-performance concrete will cause material waste and uneconomical problems

In addition, although there are some preparation technologies for high-performance low-strength concrete in the prior art, none of them involve or solve the problem of poor natural bonding between steel and low-strength high-performance concrete when used in SRC structures. question

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