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Self-compacting concrete and preparation method thereof

A technology for self-compacting concrete and mixed sand, applied in the field of concrete, can solve the problems of increased cracking risk, increased concrete shrinkage, increased amount of cementitious materials, etc., and achieves the effect of saving transportation costs and reducing costs.

Inactive Publication Date: 2019-03-19
河北联众谊诚混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few large particles in ultra-fine sand. When the mixed aggregate is composed of coarse aggregate, the intermediate gradation is missing, and the rheology of concrete is poor. When the slump is large, it is easy to cause the separation of mortar and stone; and if the intermediate gradation is missing, Increased slump will result in an increase in the amount of cementitious material, increased concrete shrinkage, and increased risk of cracking

Method used

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  • Self-compacting concrete and preparation method thereof
  • Self-compacting concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to the addition amount of each raw material in Table 1, cement, mineral powder and fly ash were added to a mechanical mixer and mixed dry for 2 minutes to obtain mixture A; weathered sand and ultrafine sand with a fineness modulus of 1.0 , stones, admixtures and water were added to another mixer and mixed for 1 minute to obtain Mixture B; Export Mixture A from the mixer and introduced into another mixer to mix with Mixture B, after stirring for 2 minutes, add the hollow glass micro The beads were mixed and stirred at a speed of 30r / min for 1.5 minutes to obtain self-compacting concrete.

Embodiment 2

[0036]According to the amount of each raw material added in Example 1, cement, mineral powder and fly ash were added to a mechanical mixer and mixed for 2 minutes to obtain mixture A; weathered sand, fineness modulus of 1.1 Add sand, stones, admixtures and water into another mixer and mix for 1 minute to obtain Mixture B; export Mixture A from the mixer and import it into another mixer to mix with Mixture B, stir for 2 minutes and then add hollow glass The microbeads were mixed and stirred at a speed of 40r / min for 1 minute to obtain self-compacting concrete.

Embodiment 3

[0038] According to the addition amount of each raw material in Example 1, cement, slag powder and fly ash were added to a mechanical mixer and mixed and dry mixed for 2 minutes to obtain mixture A; weathered sand, fineness modulus of 1.2 Add sand, stones, admixtures and water into another mixer and mix for 1 minute to obtain Mixture B; export Mixture A from the mixer and import it into another mixer to mix with Mixture B, stir for 2 minutes and then add hollow glass The microbeads were mixed and stirred at a speed of 50r / min for 0.5 minutes to obtain self-compacting concrete.

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Abstract

The invention relates to the technical field of concrete, in particular to self-compacting concrete. The self-compacting concrete contains the following raw components in parts by weight: 150-250 parts of cement, 80-120 parts of mineral powder, 80-120 parts of pulverized fuel ash, 750-850 parts of mixed sand, 150-250 parts of hollow glass microspheres, 1000-1150 parts of pebbles, 8-15 parts of admixture and 150-200 parts of water, wherein the mixed sand contains the following components in percentage by weight of the total weight of the mixed sand: 5-25% of weathered sand and 75-95% of ultrafine sand; the fineness modulus of the ultrafine sand is 1.0-1.4; the fineness modulus of the mixed sand is not less than 2.6; the hollow glass microspheres have the particle size of 200-350 micrometers; coarse aggregates and fine aggregates are combined to achieve the continuity of the aggregate grading, and the amount of a cementing material is relatively reduced in the case of the same concrete strength. The invention also provides a preparation method of the self-compacting concrete.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a self-compacting concrete and a preparation method thereof. Background technique [0002] Self-compacting concrete has significant advantages in reducing construction costs and improving the construction environment, and embodies the concept of green and energy-saving buildings. Self-compacting concrete has excellent working performance. Compared with ordinary concrete, it has obvious advantages in increasing construction speed, ensuring project quality, reducing labor, and improving the construction environment. [0003] Ultra-fine sand refers to sand with a fineness modulus of 0.70 to 1.50, which generally has the characteristics of small average particle size, poor particle gradation, small fineness modulus, large mud content, high void ratio, and large specific surface area. It is widely used in the production and processing of self-compacting concrete. However, there are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00017C04B2201/50C04B14/02C04B18/08C04B14/06C04B14/22C04B2103/302
Inventor 刘沛林
Owner 河北联众谊诚混凝土有限公司
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