A kind of concrete with c220 strength grade for steel-concrete composite structure

Abstract

The invention discloses concrete of a strength grade C220 for a steel reinforced concrete combined structure. The concrete comprises cement, fine aggregate, coarse aggregate, water, a water reducing agent, a defoaming agent, silicon powder, coal ash, an excitant, an expanding agent and a composite plastic retaining agent in a ratio of 488:742:1262:97.6:19.7:1.2:96:120:10:50:0.50. A preparation method comprises the following steps: firstly, uniformly mixing the water reducing agent, the excitant and the composite plastic retaining agent with water so as to obtain a mixture, sequentially adding the fine aggregate, the coarse aggregate and 1 / 3 of the mixture into a stirrer according to a weight ratio, adding the coarse aggregate and 1 / 3 of the mixture, uniformly mixing, adding the cement, the expanding agent, the silicon ash and the coal ash, uniformly mixing, adding the defoaming agent and the rest mixture, stirring, and discharging, thereby obtaining the concrete. By adopting the concrete, the bonding property of steel and concrete can be remarkably improved in a natural state, respective mechanical properties and mutual synergetic working properties of the steel and the concrete can be effectively taken into play, the bearing property, the use performance and the durability of a structural component can be greatly improved, and good volume stability and economy can be achieved.

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 with a strength grade of C220 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 cont...

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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 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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