C150 (strength grade) concrete for section steel-concrete combined structure

Abstract

The invention discloses C150 (strength grade) concrete for a section steel-concrete combined structure, which is characterized by being prepared by mixing cement, fine aggregate, coarse aggregate, water, water reducer, defoaming agent, siliceous dust and flash ash in a mass / volume ratio of 485:701:1,145:104:15:1:65:100. The preparation method of the concrete comprises: adding the fine aggregate and half of the total amount of water into a forceful stirrer in turn according to a weight mixing ratio, uniformly stirring for 1 to 2 minutes, adding the coarse aggregate, uniformly stirring for 2 to4 minutes, adding the cement, the siliceous dust and the flash ash, uniformly stirring for 2 to 3 minutes, adding the water reducer, the defoaming agent and the rest of water, uniformly stirring for 2 to 5 minutes, and discharging to obtain a concrete mixture. The concrete has obviously improved section steel binding performance in a natural state and can effectively play respective capability and coordinate operation performance with the section steel, thereby improving the bearing capacity and performance of a member considerably and improving the durability, high-volume stability and economy of the member.

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 C150 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 incr...

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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