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

CORC > 兰州理工大学 > 兰州理工大学 > 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 2; Qian, Chen 1; Qian, Rusheng 2; Liu, Zhiyong 2; Qiao, Hongxia 3; Zhang, Yunsheng 3
刊名	Construction and Building Materials
	2019-10-30
卷号	223 页码:806-816
关键词	Aggregates Diffusion Forecasting Hardening Hydration Microstructure Models Morphology Pore structure Powders Spheres Cement powder Effective diffusivities Hardened cement paste Hydrating cement pastes Interfacial transition zone Microstructure-based model Numerical predictions Spherical
ISSN号	09500618
DOI	10.1016/j.conbuildmat.2019.06.125
英文摘要	The numerical prediction of effective diffusion 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. © 2019 Elsevier Ltd
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000487569100069
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150600]
专题	土木工程学院
作者单位	1.Biostatistics and Bioinformatics Facility, James Graham Brown Cancer Center, University of Louisville, Louisville; KY; 40202, United States; 2.Jiangsu Key Laboratory for Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing; 211189, China; 3.School of Civil Engineering, Lanzhou University of Technology, Lanzhou; 730050, 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.