Large-flowability and high-strength concrete

Abstract

The invention discloses large-flowability and high-strength concrete, which comprises the following components in part by weight: 350 to 450 parts of cement, 30 to 60 parts of wollastonite, 40 to 90 parts of slag powder, 40 to 60 parts of coal ash, 650 to 700 parts of fine aggregates, 1,000 to 1,250 parts of coarse aggregates, 150 to 180 parts of water and 10 to 15 parts of pumping agent. The concrete particularly has high flowability while meeting requirements of performance of strength, rigidity, weight and the like of high-rise and mega-high-rise buildings, and the filling performance is improved obviously; the fine aggregates formed by mixing artificial machine-made sand and sand of Yangtze River can be distributed in the granularity from 0.075 to 4.72 millimeters, and after being mixed and filled into a template to form concrete members, the fine aggregates can be filled into gaps with various pore diameters among the coarse aggregates of a stressed skeleton, so that the strength can be improved; the performance of the fine aggregates is similar to that of natural medium sand, and the fine aggregates can be prepared from local materials, so the cost is reduced by half; and the coarse aggregates are limestone gravels with the diameters of between 5 and 10 millimeters and limestone gravels with the diameters of between 10 and 25 millimeters, and form the stressed skeleton in the concrete, so that the mechanical property of the stressed skeleton can be enhanced obviously, and the strength of the concrete can be improved.

Description

technical field [0001] The invention relates to concrete used in the field of construction, especially high-fluidity and high-strength concrete. [0002] Background technique [0003] In the field of construction, more and more high-rise and super high-rise buildings adopt reinforced concrete structures and steel cylinder structures; Performance puts forward higher requirements, requiring concrete to have high fluidity, high strength, and good durability to meet engineering needs, and high-fluidity high-strength concrete just has such characteristics. In the prior art, such as the invention patent application document named "high-strength concrete" with application number 200510017929.6, the disclosed concrete formula is (kg / m3) crushed stone>1350kg, sand<600kg, cement: 300-400kg, water : 75-140kg and water reducer: 0.5-2%, can add finely ground mineral powder to be 1 / 4 of the cement weight; its production method is to mix the above materials together for stirring, ...

AI Technical Summary

Problems solved by technology

Because the present invention adopts the "pocket" theory, the strength of concrete is greatly improved by optimizing the mix ratio of aggregates, the size and self-weight of components are further reduced, the use range of concrete is expanded, a large amount of raw materials such as cement are saved, and pollution is reduced; The strength level of concrete has been improved to a certain extent, but its fluidity and strength still need to be improved to meet the needs of high-rise and super high-rise buildings

[0004] Due to the abundant limestone aggregate resources in our country, there are few studies on high-fluidity high-strength concrete and many technical problems, which cannot meet the needs of high-rise and super high-rise buildings; therefore, it is particularly urgent to develop high-fluidity high-strength concrete. necessary

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