碳化高温后普通混凝土抗压强度及孔结构演化规律

doi:10.11896/cldb.21050152

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Abstract Concrete buildings may be suffered from carbonization and fire during application period. The combined effect of two factors on concrete structures is far greater than that of single factor. The methods of X-ray diffraction (XRD), thermogravimetry (TG) and mercury injection (MIP) were used to research the influence mechanism of carbonation time and temperature on the compressive strength of concrete. Grey entropy analysis was used to analyze the effect of different pore structures on compressive strength. The results show that the pore structure of concrete at different temperatures can be refined through carbonation, and the compressive strength can also be improved, especially in the middle period of carbonation with concrete under 400 ℃. After carbonization at high temperature, the threshold pore size and porosity of concrete show a decreasing trend, the number of small pores increases, and the density also increases. The influence on compressive strength from large to small is threshold pore size, porosity, critical pore size. At the same time, the proportion of medium sized pores decreases, while those of the large pores and gel pores increase. The compressive strength is positively correlated with the number of gel pores.

Key words： concrete carbonization high temperature pore structure grey entropy

Published: 10 October 2022 Online: 2022-10-12

CLC number:

TU528.572

Fund:National Natural Science Foundation of China (11762015,11362013)

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	Articles by authors
	ZHAO Yanru
	LIU Ming
	WANG Lei
	WANG Zhihui

Cite this article:

ZHAO Yanru,LIU Ming,WANG Lei, et al. Evolution Law of Concrete Strength and Pore Structure After Carbonization at High Temperature[J]. Materials Reports, 2022, 36(19): 21050152-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21050152 OR http://www.mater-rep.com/EN/Y2022/V36/I19/21050152

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