Concrete with strength grade of C140 used for profile steel-concrete composite structure

Abstract

The invention discloses concrete with strength grade of C140 used for a profile steel-concrete composite structure. The concrete is characterized by being prepared from cement, fine aggregate, coarse aggregate, water, a water reducing agent, an antifoaming agent, siliceous dust, coal ash(kg / m<3>) in a mixing proportion of 485:660:1,173:117:13:0.7:65:100. A preparation method of the concrete comprises the following steps of: adding the fine aggregate and the water in an amount of which is a half based on the total weight of the used water into a forced mixer according to the weight proportion in turn; uniformly stirring for 1 to 2 minutes; adding the coarse aggregate into the mixer; uniformly stirring for 2 to 4 minutes; adding the cement, the siliceous dust and the coal ash into the mixer; uniformly stirring for 2 to 3 minutes; adding the water reducing agent, the antifoaming agent and the rest water into the mixer; uniformly stirring for 2 to 5 minutes; and discharging to obtain a concrete mixture. The concrete can obviously improve the adhesive property between profile steel and the concrete in a natural state, effectively exert respective capacity and cooperative work performance of both materials, greatly improve the carrying capacity and performance of members, and improve the durability, high volume stability and economy of the members.

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 C140 for steel-concrete composite structures. Background technique [0002] Since the invention of Portland cement in 1824, concrete technology has developed rapidly, and its usage is large and its application range ranks the highest in the world. Although concrete, a man-made material, is a traditional building material, due to the irreplaceable superiority of this material and the continuous advancement of concrete material science and technology, concrete has become the main body of civil engineering materials. In the future civil engineering and It will also be one of the indispensable main materials in national construction. With the continuous expansion of city scale, population increase, land price increase, construction technology progress and rapid economic development, buildings are i...

AI Technical Summary

Problems solved by technology

[0005] The prior art is used in the preparation technology of high-strength and high-performance concrete whose concrete strength grades are C60, C70, C80, C90 and C100 for steel-concrete composite structures. However, there are still problems that cannot be extended to ultra-high-strength and high-performance concrete, that is, the ultra-high strengthening and ultra-durability of concrete, and it cannot solve the problem of section steel when it is used in steel-concrete composite structures. The problem of poor natural bonding performance with ultra-high-strength high-performance concrete, so it cannot meet the requirements of civil engineering buildings extending into the air, that is, building (ultra) high, (ultra) long-span, (ultra) durable and heavy-duty structures and so on to develop the requirements of this trend

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 natural bonding between section steel and ultra-high-strength high-performance concrete when used in steel-concrete composite structures poor performance problem

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