A kind of concrete for C45 strength grade of steel-concrete composite structure

Abstract

The invention discloses C45 strength level concrete for a steel section-concrete combined structure, which is prepared from cement, fine aggregate, coarse aggregate, water, an efficient water reducer, a defoaming agent, silica fume, fly ash, and a composite booster in a ratio of 310:698:1197:142:6:1:30:70:2.5 (kg / m<3>). A preparation method comprises the steps of: uniformly mixing polycarboxylic acidefficient water reducer and the composite booster with weighed water to obtain a mixture, adding 1 / 3 of the total amount of the fine aggregate and the coarse aggregate according to the weight ratio to a stirrer, stirring, adding 1 / 3 of the total amount of the coarse aggregate and the mixture, stirring, adding the cement,silica fume, and fly ash, stirring, adding the defoaming agent and the rest mixture, stirring, and discharging. According to the concrete, the adhesion property between the steel section and concrete is significantly improved in natural state, and the respective mechanical property and synergic working property of the steel and concrete materials are effectively exerted, so that the bearing capability and use performance of a structural element are greatly improved and the structure durability 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 C45 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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