A kind of concrete with c30 strength grade for steel-concrete composite structure

Abstract

The invention discloses concrete with a strength grade C30 for a steel reinforced concrete composite structure. The mixture ratio of cement to fine aggregate to coarse aggregate to water to an efficient slushing agent to an antifoaming agent to silica fume to coal ash to a composite catalyst (kg / m<3>) is 270:742:1124:140:4:1:20:60:2. A preparation method of the concrete comprises the steps that the polycarboxylate-type efficient slushing agent and the composite catalyst are firstly stirred into the weighed water evenly to obtain a mixture, 1 / 3 of the total quantity of the fine aggregate and the mixture is sequentially added to a stirrer according to the weight ratio, stirring is carried out, 1 / 3 of the total quantity of the coarse aggregate and the mixture is added, and stirring is carried out; the cement, the silica fume and the coal ash are added, and stirring is carried out; the antifoaming agent and the residual mixture are added, and stirring and discharging are carried out. By means of the concrete, the bonding performance between profile steel and the concrete can be remarkably improved in a natural state, the respective mechanical properties and the cooperative working property of the steel and the concrete can be effectively achieved, and therefore the bearing capacity and use performance of a structural member are greatly improved, and the durability of the structure is improved.

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 C30 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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