Concrete mix proportion design method based on minimum slurry theory

A mix ratio design and concrete technology, which is applied in the field of concrete, can solve the problems of small concrete slump, poor work performance, and large water demand, and achieve the effects of good volume stability, balanced compressive strength, and balanced work performance

Active Publication Date: 2022-03-01
ZHEJIANG COMM CONSTR GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of mixed artificial sand is complex, and the concrete prepared by it has a small slump, a large water demand, and poor workability.
Especially when preparing C30~C50 concrete, due to the less amount of concrete paste, the poor performance of concrete is especially serious

Method used

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  • Concrete mix proportion design method based on minimum slurry theory
  • Concrete mix proportion design method based on minimum slurry theory
  • Concrete mix proportion design method based on minimum slurry theory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: a kind of concrete mix ratio design method based on the minimum slurry theory disclosed by the present invention comprises the following steps,

[0022] S1 Select slurry and aggregate, and control the difference in apparent density between the slurry and aggregate within a preset range, the slurry includes cement, admixtures and water, and the aggregate includes coarse aggregate and fine bone Fine aggregate includes machine-made sand and dredging sand accounting for 0-50.00% of the total weight of fine aggregate;

[0023] S2 According to the minimum slurry theory, determine the volume of slurry required to achieve the strength level of concrete and the volume sand ratio of fine aggregate, and then determine the amount of coarse aggregate, fine aggregate, cement, admixture and water consumption;

[0024] S3 Stir and mix the coarse aggregate, fine aggregate, cement, admixture and water according to the amount of S2 to obtain concrete.

Embodiment 2

[0025] Embodiment 2: A concrete mix design method based on the minimum slurry theory disclosed in the present invention, the difference from Example 1 is that S1 selects slurry and aggregate, and controls the relationship between slurry and aggregate. The density difference is within the preset range, wherein the slurry includes cement, admixtures composed of fly ash, water, aggregates include coarse aggregates composed of crushed stones of 2.36~19.00mm, dredging sand and mechanism fine aggregate composed of sand; at the same time, set the dredging sand replacement rate (that is, the weight percentage of dredging sand in the fine aggregate) to 0~50.00%, and measure it according to the methods of GB / T208-94 and GB / T14685-2001 , to obtain the apparent density ρ of cement, admixture, water, fine aggregate and coarse aggregate C , ρ F , ρ W , ρ S , ρ G , the apparent density is shown in Table 1;

[0026] Table 1

[0027] Numbering dredged sand replacement rate ρ ...

Embodiment 3

[0028]Embodiment 3: It is a concrete mix ratio design method based on the minimum slurry theory disclosed in the present invention. The difference from Example 1 is that S2 determines the concrete that can reach the strength level of C30~C50 according to the minimum slurry theory The required slurry volume and the corresponding volume sand ratio of fine aggregate, and then determine the amount of coarse aggregate, fine aggregate, cement, admixture and water consumption. The specific implementation method is as follows.

[0029] S21 Determine the formula for calculating the volume of slurry

[0030] 1) V P =m C / ρ C +m F / ρ F +m W / ρ W ;

[0031] 2) V P =APT*S+V V ;

[0032] Among them, S=m S *R S +m G *R G =y S *ρ S *R S +(1-y S )*ρ G *R G ;

[0033] V V = (1-φ A ) / φ A ;

[0034] In the formula, V P is the slurry volume; APT is the average slurry thickness of the wrapped aggregate; S is the total surface area of ​​fine aggregate and coarse aggregate p...

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Abstract

The invention relates to a concrete mix proportion design method based on a minimum slurry theory, which comprises the following steps: S1, selecting slurry and aggregate, and controlling the difference value of apparent density between the slurry and the aggregate to be within a preset range; s2, according to the minimum slurry theory, determining the slurry volume required for reaching the strength grade of the concrete and the volume sand ratio of the fine aggregate, and further determining the use amount and the water use amount of the coarse aggregate, the fine aggregate, the cement and the admixture; s3, uniformly stirring and mixing the coarse aggregate, the fine aggregate, the cement, the admixture and the water according to the dosage in S2 to obtain the concrete. According to the invention, the density of each component in the concrete raw materials is adjusted, the dredged sand and the machine-made sand are adopted to form the fine aggregate, and the concrete mix proportion design is carried out based on the minimum slurry theory, so that the concrete volume stability is better and the cost is lower under the condition that the slump, the 28d compressive strength and the chloride ion diffusion coefficient of the concrete meet the design requirements.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a method for designing concrete mix proportions based on the minimum slurry theory. Background technique [0002] Concrete is an important material for modern building materials. It uses cement as the main gel material, and aggregates, water, and chemical admixtures (water reducers, expansion agents, etc.) and mineral admixtures (admixtures) , slag powder, etc.), mixed in an appropriate proportion, artificial stone formed by uniform pouring, mixing, compaction and curing hardening. The traditional concrete mix ratio design is designed by experienced civil engineers using their previous experience and knowledge. In the laboratory, in order to obtain the ideal concrete strength and slump, several mix ratios must be tried. This time-consuming process not only increases the waste of material but also the cost of concrete production. [0003] In order to improve the above situation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00G16C60/00
CPCC04B28/00G16C60/00C04B14/06C04B14/068C04B14/02C04B18/08C04B2103/302Y02W30/91
Inventor 宁英杰杨晖陈徐东白丽辉赵颖超傅永刚龚世文黄祎涵陈旭光王小龙
Owner ZHEJIANG COMM CONSTR GRP CO LTD
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