Effects of various inlet-gas mediums on apparent permeability of concrete under steady-state flow: Comparison between carbon-dioxide and oxygen

doi:10.1016/j.cemconcomp.2021.103995

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	Effects of various inlet-gas mediums on apparent permeability of concrete under steady-state flow: Comparison between carbon-dioxide and oxygen
	Qian, Rusheng 1,2; Liu, Cheng 1; Liu, Guojian 3; Liu, Zhiyong 1; Pang, Bo 1; She, Wei 1; Zhang, Yunsheng 1,4
刊名	Cement and Concrete Composites
	2021-05-01
卷号	119
关键词	Carbon dioxide Fly ash Gas absorption Gas permeability Gases Oxygen Pore structure Apparent permeabilities Diffusion contributions Gas pressures Outlet gas Relative permeability Steady-state flows Structure characteristic Water to cement (binder) ratios
ISSN号	0958-9465
DOI	10.1016/j.cemconcomp.2021.103995
英文摘要	Apparent gas-permeability (ka) of concrete highly depends on pore-structure and medium. However, the effects of gas-medium on permeability have yet been investigated in depth. In this work, concrete with various water-to-cement ratios and fly-ash/slag dosages is prepared for ka testing. Various gas-mediums (CO2 and O2) are applied for analyzing their effects on the ka. Meanwhile, pore-structure characteristic, inner gas-pressure, and gas-absorption in concrete are observed for exploring permeation mechanism. The results illustrate that the narrowing pore-scale effect and surface-diffusion contribution derived from gas-absorption of CO2 and O2 both have minor impacts on the ka. The ka of O2 (kO2) is higher than that of CO2 (kCO2) and their relative permeability (kO2/kCO2) ranges from 1.18 to 2.29. These deviations are mainly caused by significantly different Knudson diffusion occurring in the area near the concrete outlet-gas side (approximately 5%). © 2021
WOS研究方向	Construction & Building Technology ; Materials Science
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000636791200003
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/147695]
专题	兰州理工大学
作者单位	1.Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing; 211189, China; 2.Univ Lille, CNRS, Cent Lille, FRE 2016, LaMcube, Lab Mecan Multiphys & Multiechel, Lille; F-59000, France; 3.School of Civil Engineering, Suzhou University of Science and Technology, Suzhou; 215011, China; 4.College of Civil Engineering, Lanzhou University of Technology, Gansu Province; 730050, China
推荐引用方式 GB/T 7714	Qian, Rusheng,Liu, Cheng,Liu, Guojian,et al. Effects of various inlet-gas mediums on apparent permeability of concrete under steady-state flow: Comparison between carbon-dioxide and oxygen[J]. Cement and Concrete Composites,2021,119.
APA	Qian, Rusheng.,Liu, Cheng.,Liu, Guojian.,Liu, Zhiyong.,Pang, Bo.,...&Zhang, Yunsheng.(2021).Effects of various inlet-gas mediums on apparent permeability of concrete under steady-state flow: Comparison between carbon-dioxide and oxygen.Cement and Concrete Composites,119.
MLA	Qian, Rusheng,et al."Effects of various inlet-gas mediums on apparent permeability of concrete under steady-state flow: Comparison between carbon-dioxide and oxygen".Cement and Concrete Composites 119(2021).