C200 strength-grade concrete for formed steel concrete composite structure

Abstract

The invention discloses a C200 strength-grade concrete for a formed steel concrete composite structure, which is composed of 473 parts of cement, 846 parts of fine aggregate, 1054 parts of coarse aggregate, 98.8 parts of water, 19.6 parts of concrete superplasticizer, 1.1 parts of defoaming agent, 84 parts of silicon powder, 123 parts of expanding agent, 7.2 parts of activator and 40 parts of expanding agent. The preparation method comprises the following steps: blending the concrete superplasticizer and activator into weighed water to obtain a mixture, sequentially adding the fine aggregate and 1 / 3 of the mixture into a stirrer according to parts by weight, and stirring; adding the coarse aggregate and 1 / 3 of the mixture, and stirring; adding the cement, expanding agent, silicon powder and fly ash, and stirring; and adding the defoaming agent and the rest of mixture, stirring and discharging. The concrete can obviously improve the bonding property between the formed steel and the concrete in a natural state, effectively displays the respective mechanical properties and the synergic working performance of the steel and concrete, greatly enhances the loading capacity, service performance and durability of the structural member, and has high volume stability and economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a super / ultra-high-strength high-performance concrete with a strength grade of C200 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 con...

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Problems solved by technology

[0005] The strength grades of concrete used for steel-concrete composite structures in the prior art include high-strength high-performance concrete of C60, C70, C80, C90 and C100 and the preparation technology of ultra-high-strength high-performance concrete of C110, C120, C130, C140 and C150, the above-mentioned Concrete of various strength grades significantly improves the bonding performance between steel and (ultra) high-strength concrete, and improves the durability of the structure; however, there are still super / ultra-high-strength high-performance concrete that cannot be extended to higher strength, And when it is used in steel-concrete composite structures, it cannot solve the problem of poor natural bonding performance between steel and ultra / ultra-high-strength high-performance concrete, so it cannot meet the requirements of civil engineering buildings extending to the air, underground and water, that is, building super / ultra-high-performance concrete. Ultra-high, super / ultra-large span, underground, offshore or underwater, ultra-durable and heavy-duty, giant and novel structural engineering and other applications and development trends

In addition, in the prior art, there are also some preparation technologies for super / ultra-high strengthening and super / ultra-durability of concrete, but none of them involve or solve the relationship between section steel and ultra / ultra-high-strength high-performance concrete when used in SRC structures. The problem of poor natural bonding performance

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