Study on dynamic and static structural build-up of fresh cement paste with limestone powder based on structural kinetics model

doi:10.1016/j.conbuildmat.2021.124598

CORC > 兰州理工大学 > 兰州理工大学

	Study on dynamic and static structural build-up of fresh cement paste with limestone powder based on structural kinetics model
	Wang, Dafu 1; Zhang, Yunsheng 1,2; Xiao, Jia 3; Shi, Jiashun 4; Chen, Yidong 1; Pang, Bo 1; Wu, Meng 1; Liu, Guojian 5; Yang, Yonggan 6
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2021-10-25
卷号	305
关键词	Structural build-up Limestone powder Structural kinetics Hydration rate Mixing
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2021.124598
英文摘要	The structural build-up of fresh cement-based materials is of great significance to the early forming and later performance. A structural kinetics model (SKM) used to indicate the structural build-up was developed by combining a kinetic equation described by structural parameter (lambda) and a relationship between yield stress (Tau y) and lambda in the paper. SKM transforms the structuration rate (Athix) in linear Roussel model and the characteristic time (tc) in non-linear Perrot model into more specific indicators such as initial solid volume fraction (phi 0), rate of hydration during induction period (alpha ind), and shear rate (gamma). The yield stress (Tau y) obtained by RHEOLAB QC rotary viscometer was explored the dynamic and static structural build-up of fresh cement paste. The yield stress of fresh cement paste (W/C = 0.4) exhibits a quasilinear pattern with rate of 0.42 Pa/s for 210 min of mixing, with rate of 0.88 Pa/s for 100 min of resting after 4 min of mixing. The static yield stress of fresh cement paste evolves from linear to non-linear patterns within 100 min of resting after beyond 30 min of mixing. The fitting results show that SKM can well fit the evolution of yield stress including linear and nonlinear phases. Comparing with the dynamic structural build-up, the effect of limestone powder on the static structural build-up of cement paste is more obvious. When the mixing process is longer than 60 min, the content of limestone powder less than 20 wt % is beneficial to the structural build-up of fresh paste. Additionally, a declined rate of cement hydration in the induction period with increasing mixing time indicates that the rising yield stress, in this case, cannot be attributed entirely to the contribution of hydration to structural build-up.
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000696934400004
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148535]
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, Sch Civil Engn, Lanzhou 730050, Peoples R China; 3.Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China; 4.Southeast Univ, Sch Architecture, Nanjing 211189, Peoples R China; 5.Suzhou Univ Sci & Technol, Sch Civil Engn, Suzhou 215011, Peoples R China; 6.Hefei Univ Technol, Sch Civil Engn, Hefei 230009, Peoples R China
推荐引用方式 GB/T 7714	Wang, Dafu,Zhang, Yunsheng,Xiao, Jia,et al. Study on dynamic and static structural build-up of fresh cement paste with limestone powder based on structural kinetics model[J]. CONSTRUCTION AND BUILDING MATERIALS,2021,305.
APA	Wang, Dafu.,Zhang, Yunsheng.,Xiao, Jia.,Shi, Jiashun.,Chen, Yidong.,...&Yang, Yonggan.(2021).Study on dynamic and static structural build-up of fresh cement paste with limestone powder based on structural kinetics model.CONSTRUCTION AND BUILDING MATERIALS,305.
MLA	Wang, Dafu,et al."Study on dynamic and static structural build-up of fresh cement paste with limestone powder based on structural kinetics model".CONSTRUCTION AND BUILDING MATERIALS 305(2021).