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Green concrete mix proportion optimization method

An optimization method and concrete technology, which is applied in the field of concrete for building pouring, can solve problems such as environmental pollution, harmful dust emissions, and design methods that do not have universal applicability

Active Publication Date: 2015-09-23
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the production of one ton of cement is accompanied by one ton of CO 2 At the same time, the production of cement also leads to a large amount of harmful dust emission, which seriously pollutes the environment, destroys the ecological balance, and brings serious harm to the sustainable development of social economy and the survival of human beings.
[0003] At present, there are many concrete mix design methods for the purpose of reducing the amount of cement, but due to the limitations of the theories adopted by most of the design methods, these design methods are not universal and cannot be popularized. , can effectively consider the actual material and site construction conditions, so it can be used as an ideal tool in the design method of concrete mix ratio, filling the technical gap that has not been used to predict the hardening performance of concrete at home and abroad, and then optimize the mix ratio design method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] 1. Material testing

[0118] Material parameter determination:

[0119] The particle size distribution test of the gelled material was measured by a laser particle size analyzer, and the results are shown in Table 1 and Table 2.

[0120] Table 1 Granularity distribution of arbitrary grades of cement C

[0121]

[0122] Table 2 Particle size distribution of class Ⅱ fly ash FA in random classification

[0123]

[0124]

[0125] See Table 3 for raw material densities.

[0126] Table 3 Measured density of raw materials

[0127]

[0128] The remaining packing density of the cementitious material was measured by the minimum water demand method, and the results are shown in Table 4.

[0129] Table 4 The measured packing density and residual packing density of powder materials

[0130]

[0131] The remaining packing density of each particle size of sand and gravel is determined after the actual packing density is measured by the drainage method. The results ...

Embodiment 2

[0150] 1. Material testing

[0151] The materials used are consistent with Example 1.

[0152] 2. Mixing ratio cycle optimization process

[0153] As shown in Table 7

[0154] Table 7 Mixing ratio cycle optimization process 2

[0155]

[0156] Process 1:

[0157] The predicted slump of the reference group is 131mm, and the compressive strength is f 28d =56.6MPa, firstly adjust the gradation of sand and gravel, so that the packing density of the mixture is further increased to 0.8275, through calculation, the workability influence coefficient W drops from 0.9928 to 0.9728, and the predicted value of work performance is 158mm, which decreases at this time Water consumption up to 178L / m 3 , make W=0.9928, which is consistent with the original work performance, that is, slump=131mm, and then calculate the equivalent cement particle gap index S=0.7833, and the predicted value of the 28d compressive strength is f 28d =62.4MPa;

[0158] Process 2:

[0159] Due to the optim...

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Abstract

The invention discloses a green concrete mix proportion optimization method. The method includes the following steps of firstly, determining the concrete mix proportion meeting the performance requirement according to the design requirement and existing standard and engineering experience; secondly, measuring raw material parameters and establishing a concrete performance prediction model; thirdly, conducting loop optimization design on the existing concrete mix proportion, and obtaining the final result. According to the method, the method which can rapidly and accurately predict the work performance and compressive strength of concrete is established through the advanced particle packing theory and the rigorous mathematical derivation and through the combination with the actual test situations of site materials; by means of the concrete mix proportion optimization method established on this basis, the minimum cement utilization amount obtained on the premise of ensuring the work performance and strength of the existing design can be calculated only through a computer under the situation of no follow-up tests.

Description

technical field [0001] The invention relates to the technical field of concrete for building pouring, in particular to a method for optimizing the proportion of green concrete. Background technique [0002] Concrete is the most widely used building material in the world today. While it brings great convenience to people, it also brings serious resource, energy and environmental problems. Usually the production of one ton of cement is accompanied by one ton of CO 2 At the same time, the production of cement also leads to a large amount of harmful dust emission, which seriously pollutes the environment, destroys the ecological balance, and brings serious harm to the sustainable development of social economy and the survival of human beings. [0003] At present, there are many concrete mix design methods for the purpose of reducing the amount of cement, but due to the limitations of the theories adopted by most of the design methods, these design methods are not universal and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
Inventor 龙武剑陈瑾祥时金广邢锋王卫仑方晓亮
Owner SHENZHEN UNIV
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