A kind of concrete with c55 strength grade for steel-concrete composite structure

Abstract

The invention discloses a concrete of strength grade C55 for a profile steel reinforced concrete structure. The concrete contains the ingredients: cement, fine aggregates, coarse aggregates, water, an efficient water reducing agent, an antifoamer, silica fume, fly ash and a composite excitant, wherein the ratio (kg / m<3>) of the cement to the fine aggregates to the coarse aggregates to the water to the efficient water reducing agent to the antifoamer to the silica fume to the fly ash to the composite excitant is 330: 713: 1186: 160: 6: 1: 30: 80: 2.5. A preparation method of the concrete comprises the steps of firstly, uniformly mixing the polycarboxylic acid efficient water reducing agent and the composite excitant with the weighed water so as to obtain a mixture, sequentially adding the fine aggregates and 1 / 3 the total weight of the mixture into a stirrer according to a weight ratio, carrying out stirring, adding the coarse aggregates and 1 / 3 the total weight of the mixture into the stirrer, carrying out stirring, adding the cement, the silica fume and the fly ash into the stirrer, carrying out stirring, adding the antifoamer and the remaining mixture into the stirrer, carrying out stirring, and carrying out discharging. The concrete can be used for remarkably improving the bonding property between profile steel and the concrete in a state of nature, and respective mechanical properties and mutual cooperated working performance of two kinds of materials, i.e., the steel and the concrete are effectively exerted, so that the bearing capacity and use performance of structural elements are substantially improved, and the durability of structures 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 C55 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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