Clarifying and quantifying the driving force for the evolution of static yield stress of cement pastes

被引:39
作者
Zhang, Zedi [1 ]
Jia, Zijian [1 ]
Shi, Jinyan [1 ]
Jiang, Yifan [1 ]
Banthia, Nemkumar [3 ]
Zhang, Yamei [1 ,2 ]
机构
[1] Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Construct Mat, Nanjing 211189, Peoples R China
[2] Nanjing Inst Intelligent Addit Mfg Co Ltd, Nanjing 210000, Peoples R China
[3] Univ British Columbia, Dept Civil Engn, Vancouver, BC V6T 1Z4, Canada
基金
中国国家自然科学基金;
关键词
Cement; Steel slag powder; Static yield stress; Colloidal force; Interaction force between C-S-H; STRUCTURAL BUILDUP; PARTICLE PACKING; HYDRATION; SURFACE; THIXOTROPY; RHEOLOGY; SUPERPLASTICIZER; MODEL; MICROSTRUCTURE; SUSPENSIONS;
D O I
10.1016/j.cemconres.2023.107129
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The static yield stress evolution of cement paste is mainly driven by the colloidal force and cement hydration, while their respective roles and contributions are not yet clear. In this paper, three stages are distinguished in the first 3 h evolution of static yield stress of cement pastes (with or without steel slag powder), including the initial stage (up to 30 min), the induction stage (30-60 min) and the acceleration stage (after 60 min). It was found that colloidal force mainly contributes to the large static yield stress before the acceleration stage. The role of hy-dration was found to have determined the evolution trend of the static yield stress since the induction stage, which was identified by quantifying the interaction force between the C-S-H instead of solely considering C-S-H volume fraction. Based on quantitative results, how the physico-chemical parameters control the static yield stress evolution at each stage is identified comprehensively. This study provides a deep and quantitative un-derstanding of structural build-up process of cement paste.
引用
收藏
页数:17
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