Preparation method of self-compacting concrete based on compressible stacking model

Abstract

The invention relates to a preparation method of self-compacting concrete based on a compressible stacking model, wherein the preparation method comprises the following steps: S1, determining the volume ratio of a cementing material to aggregate according to the performance parameters of the concrete and a compressible stacking model; S2, determining the mixing amount of each component in the raw materials of the concrete according to the water-binder ratio and the preset theoretical use amount of the cementing material; and S3, uniformly stirring and mixing the components in the raw materials of the concrete according to the mixing amount in the S2 to obtain the concrete, wherein the concrete comprises a cementing material composed of cement, fly ash and mineral powder, and an aggregate composed of fine aggregate and coarse aggregate. According to the method, the mixing compactness of the aggregate and the cementing material is obtained according to the compressible stacking model, then the optimal volume ratio interval of the aggregate and the cementing material is determined, then the dosage interval of the low cementing material is obtained according to the volumetric method, and finally the self-compacting concrete of the low cementing material is obtained; and while the fluidity of concrete is ensured, the use amount of the cementing material of the self-compacting concrete is reduced.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a method for preparing self-compacting concrete based on a compressible packing model. Background technique [0002] Self-compacting concrete 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. The mix ratio design of self-compacting concrete needs to fully consider the relationship and contradiction among the fluidity, segregation resistance, self-filling property, slurry dosage and volume stability of self-compacting concrete. The principle of preparing self-compacting concrete is to reduce the yield stress of concrete enough to be overcome by the shear stress generated by its own weight through the selection and matching of admixtures, cementing materials, coarse and fine aggregates, and careful mix ...

AI Technical Summary

Problems solved by technology

[0003] The existing self-compacting concrete usually has a large content of cementitious materials, which leads to high heat of hydration, large shrinkage and creep after hardening, and the large CO2 emissions generated during the concrete production process will aggravate environmental pollution. The emission source is cement, which accounts for about 74-81% of the total CO2 emissions of concrete, followed by coarse aggregate, which accounts for about 13-20%.

Images