Concrete for steel reinforced concrete combined structure with C160 strength level

Abstract

The invention discloses concrete for a steel reinforced concrete combined structure with C160 strength level. The concrete is composed of cement, fine aggregate, coarse aggregate, water, a concrete super plasticizer, a defoaming agent, silica fume, fly ash and an activator according to a ratio of 468:782:1116:108:16:1:65:117:6. The preparation method is as follows: firstly, uniformly mixing the concrete super plasticizer and the activator in weighed water to obtain a mixture, sequentially adding 1 / 3 of total dosage of the fine aggregate and the mixture in a stirring machine according to a weight ratio, and stirring; adding 1 / 3 of total dosage of the coarse aggregate and the mixture and stirring; and adding the cement, the silica fume and the fly ash, and stirring; and adding the defoaming agent and the rest mixture, stirring and discharging. The concrete can greatly perfect the adhesive property between section steel and the concrete under a natural state, effectively play the respective mechanical properties and mutual cooperative working performance of the steel and the concrete and greatly improve the carrying capacity, application performance and durability of the structural member, thereby having good high-volume stability and economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to an ultra-high-strength high-performance concrete with a strength grade of C160 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 continuo...

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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 each strength grade significantly improves the bonding performance between steel and (ultra) high-strength concrete, and improves the durability of the structure; however, there are still ultra-high-strength high-performance concrete that cannot be extended to higher strength, and will When it is used in steel-concrete composite structures, it cannot solve the problem of poor natural bonding between steel and ultra-high-strength high-performance concrete, so it cannot meet the needs of civil engineering buildings extending to the air, underground and water, that is, super-high buildings, super-large spans Requirements for the application and development of this trend, such as globalization, undergroundization, offshore or underwater, ultra-durable and heavy-duty, giant and novel structural engineering

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

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