Numerical prediction of effective diffusivity in hardened cement paste between aggregates using different shapes of cement powder

doi:10.1016/j.conbuildmat.2019.06.125

IR > 土木工程学院

	Numerical prediction of effective diffusivity in hardened cement paste between aggregates using different shapes of cement powder
	Liu, Cheng 1; Qian, Chen 2; Qian, Rusheng 1; Liu, Zhiyong 1; Qiao, Hongxia3 ; Zhang, Yunsheng 3
	2019-10-30
发表期刊	CONSTRUCTION AND BUILDING MATERIALS
ISSN	0950-0618
卷号	223 页码:806-816
摘要	The numerical prediction of effective diffusivity in hardened cement paste has been a hot point in the past few decades. However, the shape of cement powder is normally over-simplified as sphere in most models, which may influence the accuracy of prediction. To assess this effect of the shaped simplification on the prediction of effective diffusivity in cement paste, a microstructure-based model considering irregular-shaped cement powders that are close to the real one, and spherical cement powder respectively, is presented to simulate the hydrating cement pastes between aggregates (interfacial transition zone and bulk cement paste) and predict their effective diffusivities. The results indicate that the effect of the shape of cement powder on the distributions of capillary pore and unhydrated cement is weak. Furthermore, compared to the irregular-shaped cement powder, the diffusivity in cement paste simulated using spherical cement powders is overestimated by 0-40%. It is ascribed to three discrepancies, i.e., the shape of initial cement powder, the formation of capillary pore structure, and the morphology of C-S-H. However, the predicting error using spherical cement powder is still acceptable by contrast to the large difference of diffusivity in hardened cement paste with cement hydration, i.e., normally two orders of magnitude difference between early and later curing ages. (C) 2019 Elsevier Ltd. All rights reserved.
关键词	Diffusivity Irregular-shaped cement powder Spherical Microstructure Hydration Modelling
DOI	10.1016/j.conbuildmat.2019.06.125
收录类别	SCI
语种	英语
资助项目	Ministry of Science and Technology of China (973 Program)[2015CB655102]
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
WOS类目	Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary
WOS记录号	WOS:000487569100069
出版者	ELSEVIER SCI LTD
引用统计	被引频次：15[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/31494
专题	土木工程学院
通讯作者	Liu, Zhiyong
作者单位	1.Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Construct Mat, Nanjing 211189, Jiangsu, Peoples R China 2.Univ Louisville, James Graham Brown Canc Ctr, Biostat & Bioinformat Facil, Louisville, KY 40202 USA 3.Lanzhou Univ Technol, Sch Civil Engn, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Liu, Cheng,Qian, Chen,Qian, Rusheng,et al. Numerical prediction of effective diffusivity in hardened cement paste between aggregates using different shapes of cement powder[J]. CONSTRUCTION AND BUILDING MATERIALS,2019,223:806-816.
APA	Liu, Cheng,Qian, Chen,Qian, Rusheng,Liu, Zhiyong,Qiao, Hongxia,&Zhang, Yunsheng.(2019).Numerical prediction of effective diffusivity in hardened cement paste between aggregates using different shapes of cement powder.CONSTRUCTION AND BUILDING MATERIALS,223,806-816.
MLA	Liu, Cheng,et al."Numerical prediction of effective diffusivity in hardened cement paste between aggregates using different shapes of cement powder".CONSTRUCTION AND BUILDING MATERIALS 223(2019):806-816.

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