C210-strength-level concrete for steel reinforced concrete composite structures

Abstract

The invention discloses a C210-strength-level concrete for steel reinforced concrete composite structures. The concrete is composed of 482 parts of cement, 736 parts of fine aggregate, 1252 parts of coarse aggregate, 97 parts of water, 18.8 parts of high-performance water reducing agent, 1.2 parts of defoaming agent, 96 parts of silicon powder, 120 parts of fly ash, 10 parts of excitant, 50 parts of excitant and 0.50 part of composite plastic retaining agent. The preparation method comprises the following steps: uniformly mixing the water reducing agent, excitant and composite plastic retaining agent in the water to obtain a mixture, and sequentially adding the fine aggregate and 1 / 3 of the mixture into a stirrer according to the weight ratio; adding coarse aggregate and 1 / 3 of the mixture, and uniformly mixing; adding the cement, expanding agent, silica fume and fly ash, and uniformly mixing; and adding the defoaming agent and the rest mixture, stirring and discharging. The concrete can obviously improve the bonding property between the steel bar and concrete in a natural state, effectively displays the respective mechanical properties and synergic working properties of the steel and concrete, greatly enhances the carrying capacity, service performance and durability of the structural member, and has high volume stability and favorable economical efficiency.

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 C210 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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