A kind of concrete with c35 strength grade for steel-concrete composite structure

Abstract

The invention discloses concrete with the strength grade of C35 for steel reinforced concrete composite structures. The concrete comprises cement, fine aggregate, coarse aggregate, water, a high-efficiency water reducing agent, a defoaming agent, silicon ash, coal ash and a composite excitant (kg / m<3>) in a proportioning ratio of 290:735:1103:150:4:1:20:70:2. A preparation method of the concrete comprises the following steps: firstly, uniformly mixing a polycarboxylic acid high-efficiency water reducing agent and the composite excitant into weighed water so as to obtain a mixture, sequentially adding fine aggregate and 1 / 3 of the mixture into a stirring machine according to the weight proportioning ratio, adding coarse aggregate and 1 / 3 of the mixture, stirring, adding cement, silicon ash and coal ash, stirring, adding the defoaming agent and the rest mixture, stirring, and discharging. According to the concrete, the bonding property of steel and concrete can be greatly improved in a natural state, and respective mechanical properties and mutual cooperative working performance of the two materials, namely, steel and concrete, can be effectively brought into play, so that the bearing property and the use performance of a structural part can be greatly improved, and the structural durability can be 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 C35 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

Images