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A Concrete Slump Inference Method Based on Mix Ratio and Raw Material Properties

A mix ratio, concrete technology, applied in the direction of analyzing materials, material inspection products, instruments, etc., can solve problems such as large differences in porosity, achieve high accuracy, improve accuracy, and avoid subjective arbitrariness.

Active Publication Date: 2022-03-18
HUBEI GEZHOUBA TESTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the "filling theory" and experience of mix ratio design, it can be seen that the workability of concrete mixture is closely related to the void ratio when sand and stones are piled up, the filling degree of mortar and mortar to aggregate voids, and the fluidity of mortar. The relationship between stones with the same maximum particle size and sand with the same fineness modulus will have greatly different void ratios. Cement, admixtures and admixtures with the same classification have different performances. They are combined with water. The fluidity of the mortar will also be very different, so the existing method of looking up the table will inevitably bring about the deviation of the selection of the mixing ratio parameters

Method used

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  • A Concrete Slump Inference Method Based on Mix Ratio and Raw Material Properties
  • A Concrete Slump Inference Method Based on Mix Ratio and Raw Material Properties
  • A Concrete Slump Inference Method Based on Mix Ratio and Raw Material Properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 Infer the slump according to the concrete mix ratio and raw material properties, and conduct a mix ratio review

[0059] Given a concrete mix ratio, the amount of various materials per cubic meter of concrete and the test results of raw material properties are as follows:

[0060] 149kg of water, 356kg of cement, 883kg of sand, 438kg of small stones, 656kg of medium stones, and 2.848kg of water reducing agent, the amount of sand and stone is the amount in the air-dried state;

[0061] Cement: Density 3060kg / m 3 ;

[0062] Sand: apparent density 2640kg / m 3 , loose bulk density 1560kg / m 3 ;

[0063] Stone: maximum particle size 40mm, apparent density 2800kg / m 3 , the combined loose bulk density is 1526kg / m 3 ;

[0064] Water reducing agent: dosage 0.8%, water reducing rate 36%;

[0065] Fluidity of glue: 400mm.

[0066] Infer slump as follows:

[0067] 1) Calculation of sand surplus coefficient (F s )

[0068] Amount of sand per square concrete M s ...

Embodiment 2

[0096] Example 2 According to the requirements of concrete slump and raw material performance, the water consumption is back-calculated to guide the design of mix ratio

[0097] In a concrete mix design, the slump is required to be 50mm to 70mm, the water-binder ratio is selected as 0.34, the sand rate is selected as 27%, the air content is 3.0%, and the sand and stone are in a saturated surface-dry state.

[0098] Cement: Density 3200kg / m 3 ;

[0099] Fly ash: density 2410kg / m 3 , the amount of fly ash is 15%;

[0100] Sand: apparent density 2680kg / m 3 , loose bulk density 1560kg / m3 , water absorption 0.9%;

[0101] Stone: maximum particle size 40mm, apparent density 2690kg / m 3 , combined loose bulk density 1740kg / m 3 , water absorption 0.2%;

[0102] Water reducing agent: dosage 0.8%, water reducing rate 20%;

[0103] Fluidity of glue: 150mm.

[0104] Follow the steps below to calculate water consumption:

[0105] 1) Inverse calculation of concrete flow factor (X ...

Embodiment 3

[0152] Example 3 Adjust the existing mix ratio according to the changes in the properties of concrete raw materials

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Abstract

The invention relates to a method for estimating the slump of concrete based on the mixing ratio and the properties of raw materials. The mathematical formula is imported to reveal the quantitative relationship between the proportion of concrete raw materials, performance indicators and the slump of the mixture, which can be used for concrete mix design, review and mixing production quality control.

Description

technical field [0001] The invention belongs to the field of concrete production and relates to a method for estimating the slump of concrete based on the mix ratio and the properties of raw materials. Background technique [0002] In the design of concrete mix ratio, it is an important principle to meet the requirements of construction workability, and the main index of workability is slump. When initially selecting the mix ratio parameters, the unit water consumption and sand rate should be selected according to the slump that the concrete mixture needs to achieve. The existing method is to look up the table and divide the coarse aggregate into pebbles and gravels, Classify according to the maximum particle size, classify the slump according to the size, look up the corresponding water consumption from the table given in the mix ratio design specification according to the aggregate type, particle size and slump, according to the aggregate particle size and water-binder rat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 陈志远薄茗月许娜刘敬科谭恺炎陈军琪刘晓梦张新源张振宇陈卫烈聂卫平朱圣敏简宜端杨平王晓东谢严君李金明
Owner HUBEI GEZHOUBA TESTING
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