A kind of concrete with c230 strength grade for steel-concrete composite structure

Abstract

Concrete used for a steel reinforced concrete composite structure and having the C230 strength grade is disclosed. A ratio of cement, fine aggregate, coarse aggregate, water, a water reducing agent, a defoaming agent, silica fume, fly ash, an activator, an expanding agent and a composite plastic retaining agent is 495:755:1284:100.5:20:1.4:98:122:10.5:51:0.60. The preparing method includes fully mixing the water reducing agent, the activator and the composite plastic retaining agent with the water to obtain a mixture, adding the fine aggregate and one third of the mixture into a stirrer in order, fully mixing, adding the coarse aggregate one third of the mixture in order, fully stirring, adding the cement, the expanding agent, the silica fume and the fly ash, fully stirring, adding the defoaming agent and the rest of the mixture, stirring and discharging. The concrete significantly improves adhesion performance between section steel and concrete under natural states, effectively exerts mechanical properties of the steel and the concrete and synergistic properties, greatly improves bearing capacity, using performance and durability of structural components, and has good high size stability and economical performance.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and relates to an ultra-high-strength and high-performance concrete used for a steel-concrete composite structure with a strength grade of C230. Background technique [0002] The invention of Portland cement in 1824 led to the rapid development of concrete technology. Its large amount and wide range of applications are the largest in the world. Although concrete is a traditional man-made building material, because of its irreplaceable advantages (rich 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 , Will also be one of the indispensable main materials in future civil engineering and national construction. At the same time, as the scale of the city continues to expand, the population continues to increase, the land price continues ...

AI Technical Summary

Problems solved by technology

[0005] The strength grades of concrete used for steel-concrete composite structures in the prior art include low-strength high-performance concrete of C30, C35, C40, C45, C50 and C55, high-strength high-performance concrete of C60, C70, C80, C90 and C100, and C110, C120, C130, C140, and C150 ultra-high-strength high-performance concrete, as well as the preparation technology of C160, C170, C180, C190, and C200 ultra-high-strength high-performance concrete. ) between the high-strength concrete, and improve the durability of the structure; however, there are still 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 steel The problem of poor natural bonding performance with ultra-high-strength and high-performance concrete, so it cannot meet the requirements of civil engineering buildings extending to the air, underground and water, that is, super / ultra-high buildings, super / ultra-large spans, underground, sea or Underwater, ultra-durable and heavy, 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 natural relationship between section steel and ultra-high-strength high-performance concrete when used in SRC structures. The problem of poor bonding performance

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