C70 self-compacting concrete and preparation method thereof

Abstract

The invention discloses a C70 self-compacting concrete and a preparation method thereof, and relates to the technical field of concretes. The C70 self-compacting concrete is prepared from, by weight,370 to 390 parts of cement, 800 to 815 parts of sand, 890 to 910 parts of broken stone, 90 to 110 parts of fly ash, 100 to 120 parts of mineral powder, 35 to 50 parts of silicon powder, 12 to 18 partsof a high-efficiency water reducing agent, 0.2 to 0.5 part of an air entraining agent, 0.1 to 0.6 part of a defoaming agent microcapsule and 150 to 165 parts of water. The preparation method comprises the following steps: 1, uniformly stirring and mixing the broken stone, the sand, the cement, the fly ash, the mineral powder and the silicon powder to obtain a first mixture; 2, uniformly mixing water, a superplasticizer and an air entraining agent, adding the obtained mixture into the first mixture, and uniformly stirring to obtain a second mixture; and 3, adding the defoaming agent microcapsule into the second mixture, and stirring for 13-17 S to obtain the C70 self-compacting concrete. The preparation method has the advantages of ensuring the flowability of the concrete and improving thestrength of the concrete, and the preparation method is simple and easy to implement.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a C70 self-compacting concrete and a preparation method thereof. Background technique [0002] Self-compacting concrete (SCC for short) refers to the concrete that can flow and compact under its own gravity, and can completely fill the formwork even if there are dense steel bars, and at the same time obtain good homogeneity and do not require additional vibration. [0003] At present, with the leap-forward development of high-rise or super high-rise buildings, the amount of high-strength concrete is increasing. However, since high-rise or ultra-high-rise buildings generally have complex structures and dense reinforcement, while requiring high-strength concrete, it also needs to have self-compacting properties. [0004] In the application document with the publication number CN109467352A, a C70 high-strength self-compacting concrete formula and its preparation me...

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Problems solved by technology

[0006] The C70 high-strength self-compacting concrete prepared by the above scheme has the following defects: the air-entraining agent and defoamer are directly configured in the composite water-reducing agent, and when the composite water-reducing agent is added to the concrete raw materials, the air-entraining agent and The defoaming agent will eliminate some of the bubbles introduced by the air-entraining agent. The air-entraining agent and the defoaming agent restrain each other and affect each other, so that the functions of both cannot be fully exerted, resulting in a decrease in the fluidity of the prepared concrete. The workability of concrete has a direct impact on

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