碳化混凝土孔隙结构与Autoclam气体渗透性能的关联性研究

doi:10.11896/cldb.21080026

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Abstract The C30 concrete specimens were exposed in a 20vol% CO₂ atmosphere at different ages for the accelerated carbonation test. The carbonated concrete's gas permeability coefficient (k_Au) and pore structure parameters were measured by the Autoclam test system and the mercury intrusion porosimetry (MIP). The relationship between k_Au and pore structure parameters was studied by grey correlation analysis (GRA). The test results showed that the air permeability coefficient of the carbonated concrete increased exponentially with the increase of exposure time. The porosity, characteristic pore size and pore connectivity of the carbonated concrete increased with the exposure time as well. For the change of pore distribution with the exposure time, the volume ratio of pores smaller than 200 nm decreased, the volume ratio of pores with the diameter of 200—1 000 nm increased, and the volume ratio of pores larger than 1 000 nm was unchanged. The GRA results showed that the pore structure parameters with the highest correlation with the k_Au are the volume ratio of 50—200 nm pores, pore connectivity, and porosity. The grey correlation coefficients of the above three parameters are 0.932, 0.907 and 0.888, respectively. The linear relation model between k_Au and the three parameters was established by regression, laying the foundation for future work on establishing a service life prediction model based on gas permeability coefficient.

Key words： concrete accelerated carbonation pore structure air permeability coefficient grey correlational analysis

Published: 25 April 2023 Online: 2023-04-24

CLC number:

TU528

Fund:National Natural Science Foundation of China (51961135202).

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	ZHANG Cheng
	WANG Ling
	YAO Yan
	SHI Xinyu

Cite this article:

ZHANG Cheng,WANG Ling,YAO Yan, et al. On the Relationship Between Pore Structure and Gas Permeability from Autoclam Test in Carbonated Concrete[J]. Materials Reports, 2023, 37(8): 21080026-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21080026 OR http://www.mater-rep.com/EN/Y2023/V37/I8/21080026

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