The role of coal gasification slag in cement paste with and without polycarboxylate superplasticizer and its rheology

被引：26
作者：
Tian, Yi [1 ,2 ]
Xie, Zonglin [1 ]
Xue, Kaiwei [1 ]
Yuan, Qiang [1 ,2 ]
Yang, Changhui [3 ]
Fu, Bo [4 ,5 ]
Zhu, Xiaohong [6 ]
机构：
[1] Cent South Univ, Sch Civil Engn, Changsha, Peoples R China
[2] Natl Engn Res Ctr High Speed Railway Construction, Changsha, Peoples R China
[3] Chongqing Univ, Coll Mat Sci & Engn, Chongqing, Peoples R China
[4] North Minzu Univ, Coll Civil Engn, Yinchuan 750021, Peoples R China
[5] Ningxia Coal Ind Co Ltd, Coal Chem Ind Technol Res Inst, Natl Energy Grp, Yinchuan 720021, Peoples R China
[6] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2023年 / 373卷
基金：
中国国家自然科学基金;
关键词：
Coal gasification slag; Workability; Surface free energy; Interparticle forces; Polycarboxylate superplasticizer (PCE); Aggregation; FLY-ASH; AGGREGATION; SURFACTANTS; PARTICLES; HYDRATION; BEHAVIOR;
D O I：
10.1016/j.conbuildmat.2023.130852
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Coal gasification slag (CGS) is the main by-product of coal gasification technology, and the utilization of CGS as mineral admixture is environmentally sound. In this paper, the effect and mechanisms of CGS on the workability (i.e., fluidity and rheological behaviors) of ordinary Portland cement (OPC) paste with and without poly-carboxylate superplasticizer (PCE) were studied. The zeta potential and surface free energies of OPC and CGS were tested to calculate the electrostatic force and Van der Waals force variations due to the addition of CGS particles. The results revealed that CGS mainly decreases the van der Waals attraction force between binder particles, enhancing the fluidity and reducing cement pastes' yield stress and plastic viscosity. When blended with PCE, the dissolution of CGS mainly increased the ionic concentrations of Si(OH)x(4-x), which promoted the aggregation of PCE and decreased its adsorption, thus decreasing the fluidity and increasing the rheological parameters.
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页数：12
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