磨细循环流化床粉煤灰对泡沫轻质土力学性能和孔结构的影响

doi:10.11896/cldb.24020041

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Abstract To promote the resource utilization of circulating fluidized bed fly ash (CFA) and reduce cement consumption, the reactivity of CFA was activated by grinding. Foamed concrete was prepared by partially replacing cement with refined circulating fluidized bed fly ash (RCFA). The influence of RCFA content on the water requirement, setting time, hydration heat and hydration product of the composite cementitious system, as well as the workability and mechanical properties of foamed concrete was studied. The effect of RCFA on the pore structure of foamed concrete was studied by X-ray tomography and image processing technology. The results show that increasing the amount of RCFA increased the water requirement of composite cementitious system, prolonged setting time, slowed down hydration rate, reduced cumulative hydration heat release and raised the unit cement hydration heat. At the substitution rate of 30%, RCFA can fully react with cement, improve the pore structure and mechanical properties of foamed concrete. A higher content of RCFA is detrimental to the pore structure and mechanical properties of foamed concrete. However it can still meet the mechanical needs of subgrade filling under the replacement level of 70%.

Key words： circulating fluidized bed fly ash foamed concrete mechanical property pore structure

Published: 25 November 2024 Online: 2024-11-22

CLC number:

U414

Fund:Taishan Scholar Foundation of Shandong Province (tsqn201909032).

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	Articles by authors
	ZHANG Hongzhi
	LIANG Quping
	SHAO Mingyang
	JIANG Nengdong
	YANG Mengyu
	SUI Gaoyang
	GE Zhi

Cite this article:

ZHANG Hongzhi,LIANG Quping,SHAO Mingyang, et al. Influence of Circulating Refined Fluidized Bed Fly Ash on Mechanical Properties and Pore Structure of Foamed Concrete[J]. Materials Reports, 2024, 38(22): 24020041-7.

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http://www.mater-rep.com/EN/10.11896/cldb.24020041 OR http://www.mater-rep.com/EN/Y2024/V38/I22/24020041

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