Microscopic Modelling of Permeability in Cementitious Materials: Effects of Mechanical Damage and Moisture Conditions

doi:10.3151/jact.19.1120

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	Microscopic Modelling of Permeability in Cementitious Materials: Effects of Mechanical Damage and Moisture Conditions
	Liu, Cheng 1; Qian, Rusheng 1; Wang, Yuncheng 1; Liu, Zhiyong 1; Zhang, Yunsheng 2
刊名	JOURNAL OF ADVANCED CONCRETE TECHNOLOGY
	2021-11
卷号	19 期号:11 页码:1120-1132
ISSN号	1346-8014
DOI	10.3151/jact.19.1120
英文摘要	Microcracking induced by mechanical damage and moisture conditions both significantly modify the transport paths of aggressive species in cementitious materials. This study proposes a microscopic model to evaluate the coupling effects of microcracks and moisture conditions on gas permeability in cementitious materials accounting for its heterogeneous microstructure. The 3D microstructure of hydrating cement paste was simulated using a voxel-based hydration model, based on which the fracture process of cement paste under the uniaxial tensile loading was simulated using a finite element model. Subsequently, treating the damaged cement paste with various damage degrees as input, a lattice Boltzmann modelling framework was present to mimic the gas permeability of partially saturated cement paste considering the moisture distribution in its pore structure. Results indicate that gas permeability of cement paste with a lower waterto-cement ratio is more sensitive to the damage and the relative gas permeability is increased with the increase of damage degree. With the increasing water saturation level, the permeation paths for gas in cement paste are declined, while the air-filled microcracks as permeation paths are not significantly influenced. At a given damage degree, the increasing water saturation level leads to an increase in the relative gas permeability.
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
语种	英语
出版者	JAPAN CONCRETE INST
WOS记录号	WOS:000723844200003
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150087]
专题	兰州理工大学
作者单位	1.Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China; 2.Lanzhou Univ Technol, Coll Civil Engn, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Liu, Cheng,Qian, Rusheng,Wang, Yuncheng,et al. Microscopic Modelling of Permeability in Cementitious Materials: Effects of Mechanical Damage and Moisture Conditions[J]. JOURNAL OF ADVANCED CONCRETE TECHNOLOGY,2021,19(11):1120-1132.
APA	Liu, Cheng,Qian, Rusheng,Wang, Yuncheng,Liu, Zhiyong,&Zhang, Yunsheng.(2021).Microscopic Modelling of Permeability in Cementitious Materials: Effects of Mechanical Damage and Moisture Conditions.JOURNAL OF ADVANCED CONCRETE TECHNOLOGY,19(11),1120-1132.
MLA	Liu, Cheng,et al."Microscopic Modelling of Permeability in Cementitious Materials: Effects of Mechanical Damage and Moisture Conditions".JOURNAL OF ADVANCED CONCRETE TECHNOLOGY 19.11(2021):1120-1132.