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

A self-compacting concrete and concrete technology, which is applied in the field of concrete, can solve the problems of large creep, high heat of hydration, and aggravating environmental pollution, and achieve the effects of easy operation, reducing the amount of cementitious materials, and ensuring fluidity

Active Publication Date: 2022-01-14
ZHEJIANG COMM CONSTR GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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%.

Method used

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

Examples

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Embodiment 1

[0020] Embodiment 1: a method for preparing self-compacting concrete based on a compressible packing model disclosed by the present invention, comprising the following steps,

[0021] S1 Determine the volume ratio of cementitious material and aggregate according to the performance parameters of concrete and the compressible packing model;

[0022] S2 Determine the dosage of each component in the raw material of the concrete according to the water-binder ratio and the predetermined theoretical dosage of the cementitious material;

[0023] S3 Stir and mix each component in the raw material of the concrete according to the dosage of S2 to obtain concrete;

[0024] Among them, concrete includes cement, fly ash, mineral powder, and aggregates composed of fine aggregate and coarse aggregate.

Embodiment 2

[0025] Embodiment 2: a method for preparing self-compacting concrete based on a compressible packing model disclosed by the present invention, the difference from Embodiment 1 is that the specific implementation of S1 is as follows,

[0026] S11 Collect the performance parameters of cementitious materials and components in the aggregate, the performance parameters include density, particle size distribution and particle size volume fraction; specifically, use the pycnometer drainage method to measure cement, fly ash, mineral powder, fine The density of aggregate and coarse aggregate, the measurement results are shown in Table 1; the particle size distribution of cement, fly ash, slag, fine aggregate and coarse aggregate was measured by laser particle size analyzer, and the standard vibrating screen was used to sieve Measure the particle size volume fraction of cement, fly ash, mineral powder, fine aggregate and coarse aggregate, and the measurement results are shown in Table 2 ...

Embodiment 3

[0039] Embodiment 3: a method for preparing self-compacting concrete based on a compressible packing model disclosed in the present invention, the difference from Embodiment 1 is that the specific implementation of S2 is as follows,

[0040] S21 Determine the volume ratio of water to cementitious material according to the predetermined compressive strength of concrete and the packing density of cementitious material, that is, the water-cement ratio is (1.12~1.33):1;

[0041] S22 According to the requirements of Green CC concrete, determine the theoretical dosage of cementitious material to be 320~370kg / m³, and then determine the volume of cementitious material, water and aggregate in order in combination with the water-binder ratio, and then determine the cementitious material, water and aggregate The dosage of each component in

[0042]S23 Determine the dosage of the water reducing agent according to the dosage of the gelling material, wherein the dosage of the water reducing...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08
CPCC04B28/08C04B7/02C04B18/08C04B14/02C04B14/068Y02W30/91
Inventor 宁英杰白丽辉陈徐东黄祎涵傅永刚赵颖超龚世文李清云
Owner ZHEJIANG COMM CONSTR GRP CO LTD
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