Self-compacting concrete and preparation method thereof

Abstract

The invention relates to a self-compacting concrete. The self-compacting concrete comprises, by weight, 410 to 420 parts of cement, 50 to 60 parts of fly ash, 30 to 35 parts of slag powder, 750 to 760parts of sand, 970 to 980 parts of coarse aggregate, 10 to 15 parts of an additive, 28 to 35 parts of an expanding agent and 150 to 160 parts of water, wherein the coarse aggregate comprises cobblestone and phase-change ceramsite in a weight ratio 5: 1, and the additive comprises a polycarboxylate superplasticizer and a binder in a mass ratio of 2: 1. According to the invention, the expanding agent and a composite phase-change material are added into the concrete, so gaps in the self-compacting concrete are filled, and internal cracks in the concrete are reduced.

Description

technical field [0001] The invention relates to a self-compacting concrete and a preparation method thereof. Background technique [0002] The self-compacting concrete mixture has sufficient plastic viscosity. It can flow and fill densely under its own weight during pouring. It can also completely fill the formwork in dense steel bars to obtain good homogeneity. [0003] The patent with the authorized notification number CN101805160B discloses a self-compacting concrete. The slurry mixture in the concrete includes cement and fly ash, wherein the fly ash includes fly ash floating beads and alkaline activated fly ash floating beads, pulverized coal Ash floating beads and alkaline activated fly ash floating beads have the characteristics of heat resistance and heat insulation. During the construction process, the hydration reaction of cement generates a lot of heat. This leads to a large temperature difference between the inside and the surface of the concrete, resulting in in...

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Problems solved by technology

[0003] The patent with the authorized notification number CN101805160B discloses a self-compacting concrete. The slurry mixture in the concrete includes cement and fly ash, wherein the fly ash includes fly ash floating beads and alkaline activated fly ash floating beads, pulverized coal Ash floating beads and alkaline activated fly ash floating beads have the characteristics of heat resistance and heat insulation. During the construction process, the hydration reaction of cement generates a lot of heat. It leads to a large temperature difference between the inside and the surface of the concrete, resulting in inconsistent temperature differences between the inside and outside. When a large external force is applied, cracks may occur inside or on the surface of the concrete, which affects the strength of self-compacting concrete.

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