再生微粉与矿物掺合料对混凝土力学性能及微观结构的影响

doi:10.11896/cldb.22070218

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Abstract In order to improve the utilization rate of recycled powder in concrete, the mechanical properties and microstructure of single-doped recycled powder concrete and compound recycled powder, fly ash and silica ash concrete were compared. The results show that the single-doped recycled fine powder and the three-way re-mixing have different degrees of influence on the compressive strength and pore structure of the concrete, and when the dosage is less than 20%, the compressive strength of the single-doped recycled fine powder is higher than that of the re-mixed concrete when it was combined, and the porosity was also reduced relative to the re-doping time. When the dosage is higher than 20%, the compounding effect is better than that of single doping, especially when the compounding is 30%, the compressive strength of the concrete in 28 d is increased by 33.4% compared with the single doping by 30%, and the total porosity and the proportion of large pores to total pores are reduced by 4.4% and 17.77%, respectively. This shows that when the amount of recycled powder is incorporated, it will adversely affect the concrete, but after adding fly ash and silica ash, it can play a synergistic effect to improve the composite cement matrix strength and pore structure of the concrete.

Key words： recycled powder concrete microstructure mechanical property pore structure synergistic effect

Published: 10 March 2024 Online: 2024-03-18

CLC number:

TU528

Fund:National Natural Science Foundation of China (51668052) and Qinghai Provincial Science and Technology Department Basic Research Project (2023-ZJ-725).

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	CHEN Lijun
	LI Ying
	CHEN Wenhao

Cite this article:

CHEN Lijun,LI Ying,CHEN Wenhao. Effect of Recycled Powder and Mineral Admixture on the Mechanical Properties and Microstructure of Concrete[J]. Materials Reports, 2024, 38(5): 22070218-6.

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https://www.mater-rep.com/EN/10.11896/cldb.22070218 OR https://www.mater-rep.com/EN/Y2024/V38/I5/22070218

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