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High-flow-state anti-segregation self-compacting concrete

A self-compacting concrete and anti-segregation technology, applied in the field of building materials, can solve the problems of parameter value and meaning difference, and achieve the effect of improving fluidity, ensuring cohesion, and reducing water-binder ratio

Active Publication Date: 2017-12-12
中国人民解放军63926部队
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Different theoretical basis and different design steps will cause great differences in the value and meaning of each parameter

Method used

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Embodiment 1

[0038] The following is a specific C30 concrete mix ratio design (numbered as SCC mix ratio) configured in the construction of the cast-in-place concrete acoustic wind tunnel project for the concrete of the present invention. For the convenience of comparing the difference between ordinary concrete and self-compacting concrete, the following The mix ratio corresponding to ordinary concrete is also listed in the table (the mix ratio numbered as NC).

[0039] Table 2

[0040]

[0041] cement:

[0042] The cement used in SCC and NC concrete raw materials is P•O 42.5R early-strength ordinary Portland cement produced by Beichuan Zhonglian Cement Co., Ltd., which contains 6% gypsum, 6% limestone powder, 10% slag, and 0.06% grinding aid. %, the specific surface area is 373-388㎡ / kg, the 3d compressive strength is 33.9MPa, and the 28d compressive strength is 52.7MPa.

[0043] Fine aggregate:

[0044] Manufactured sand: It is the sand made of rocks after soil removal, mechanical c...

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Abstract

The invention discloses high-flow-state anti-segregation self-compacting concrete. The concrete comprises the following components (cubic amount: kg / m<3>): 240-290 parts of cement, 80-110 parts of slag powder, 50-80 parts of coal ash, 860-915 parts of fine aggregate, 870-900 parts of coarse aggregate, 4.2-5.6 parts of additive, and 170-185 parts of water; fine aggregate is mixed sand of machine-made sand and superfine sand, wherein the fineness modulus of the mixed sand is not less than 2.4; and the coarse aggregate is mixed stone formed by mixing small pebbles with particle size of 5-10mm and gravels with the particle size of 10-16mm according to the mass ratio of 1:1. In use, the high-flow-state anti-segregation self-compacting concrete can flow through narrow clearances with dense reinforcements under the self weight without vibrating, and keep good cohesiveness, so that the occurrence of segregation phenomenon can be prevented, and the engineering quality and construction efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a high-fluidity anti-segregation self-compacting concrete without vibration. Background technique [0002] With the development of social economy and construction technology, architectural forms are becoming more and more abundant, and complex special-shaped cast-in-place structures put forward higher requirements for concrete materials and construction technology. Concrete materials with high fluidity, cohesion, and segregation resistance, such as self-compacting concrete, self-leveling concrete, and vibration-free concrete, have become a new focus. At present, researchers from all over the world have explored the design theories and methods of self-compacting concrete from different aspects, and have formed a variety of mix ratio design methods for self-compacting concrete based on different principles or control parameters. Different theoretical basis and diffe...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/20C04B2201/50C04B18/141C04B18/08C04B14/06C04B14/02C04B18/12C04B24/24
Inventor 李博平张笈玮刘波白联锋罗琳娜
Owner 中国人民解放军63926部队
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