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The method of testing the performance of concrete admixture by mortar method

A concrete admixture and concrete technology, which is applied in measuring devices, flow characteristics, instruments, etc., can solve the problems of large amount of materials used, many personnel required, and lack of specificity, and achieves small error in the mortar detection test, accurate test results, and high test results. big error effect

Active Publication Date: 2019-11-05
河北合众建材有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cement slurry method cannot fully reflect the performance of the admixture; the concrete method requires a lot of work, a large amount of materials used, and a large number of personnel
In the "Technical Specifications for the Application of Concrete Admixtures" GB50119, there is a "rapid test method for the compatibility of concrete admixtures", the determined mortar mix ratio is not strongly correlated, and the test content is not comprehensive and specific

Method used

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  • The method of testing the performance of concrete admixture by mortar method
  • The method of testing the performance of concrete admixture by mortar method
  • The method of testing the performance of concrete admixture by mortar method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0054] 1. Set the concrete base mix ratio as

[0055] Table 1

[0056]

[0057] The particle size distribution of the aggregate is:

[0058] (1) Sand Table 2

[0059]

[0060] (2) Stone Table 3

[0061]

[0062]

[0063] (3) Calculation of K value (round sphere)

[0064]Among them, the percentage of sand particles with a particle size of 5mm and above measured by sieve analysis is 10%, that is, A=10%, and the calculated K value is:

[0065] K=〔∑(β g ÷r g )÷(1+A)〕÷〔∑(β s ÷r s )÷(1-A)〕×100%

[0066] =[0.1÷2.275+0.4÷1.75+0.4÷1.275+0.1÷0.7125+0.1÷0.7125〕÷(1+0.1)÷〔0.15÷0.375+0.2÷0.1875+0.2÷0.094+0.2÷0.04725+0.15÷0.02375〕 ÷(1-0.1)×100%

[0067] =[(0.0440+0.2286+0.3137+0.1404+0.1404)÷1.1〕÷[(0.4000+1.0667+2.1277+4.2328+6.3158)÷0.9〕×100%

[0068] =0.7883÷15.7144×100%=5.0%.

[0069] Note: The side length L of the cube and the radius r of the sphere are multiples, and the calculation results are the same.

[0070] 2. Calculate the ratio of mortar

[0071] (1) Ca...

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Abstract

The invention discloses a mortar method for detecting performance of a concrete admixture and belongs to the technical field of concrete admixtures. The method comprises the following steps: adding anadmixture into mortar, detecting mortar expansion, expansion loss, mortar setting time and mortar strength, and converting a concrete mix proportion into a mortar mix proportion, namely (1) setting aconcrete reference mix proportion, wherein the concrete materials per cubic meter comprise M kg of binding materials, W kg of water and aggregate, the aggregate comprises Sc kg of sand and G kg of stones; (2) determining a mortar proportion, and controlling the amount of the binding materials and a water-binder ratio invariable, wherein the sand consumption Ss is equal to Sc*(1-A)+(G+Sc*A)*K, A represents a retained percentage of particles of 5mm or more in concrete sand, and K represents a ratio of equal-mass specific surface areas of aggregate of 5mm or more to aggregate of 5mm or less in the concrete; (3) determining the converted mortar mix ratio volume, and controlling the air content in the mortar to be X, wherein the mortar volume V is equal to M / rho binding material +Ss / rho sand+W / rho water +X. According to the method, the performance of the admixture can be rapidly and effectively detected.

Description

technical field [0001] The invention belongs to the technical field of concrete admixture, relates to the detection of the performance of the concrete admixture, in particular to a method for detecting the performance of the concrete admixture by the mortar method. The method of the invention is simple, can quickly and effectively detect the performance of the admixture, and can simultaneously detect the influence of a certain material in the concrete on the performance of the admixture and the mortar. Background technique [0002] Concrete is a general term for engineering composite materials in which aggregates are cemented into a whole by cementitious materials. Generally speaking, the term concrete refers to cement as cementing material, sand and stone as aggregate, mixed with water (with or without admixtures and admixtures) in a certain proportion, and obtained by stirring, molding and curing. BS. Mortar is prepared by a certain proportion of cementitious material, f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00
CPCG01N11/00
Inventor 吴建忠拜秀玲邱汉张虎善
Owner 河北合众建材有限公司
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