Effects of polycarboxylate superplasticizer on rheological properties and early hydration of natural hydraulic lime

被引：27
|
作者：
Zhu, Jianfeng [1 ]
Hui, Jing [1 ]
Luo, Hongjie [1 ,2 ]
Zhang, Biao [1 ]
Wei, Xiaohong [1 ]
Wang, Fen [1 ]
Li, Yunfeng [1 ]
机构：
[1] Shaanxi Univ Sci & Technol, Sch Mat Sci & Engn, Inst Silicate Cultural Heritage, Shaanxi Key Lab Green Preparat & Functionalizat I, Xian 710021, Peoples R China
[2] Shanghai Univ, Res Inst Cultural Rel, Shanghai 200444, Peoples R China
来源：
CEMENT & CONCRETE COMPOSITES | 2021年 / 122卷
基金：
国家重点研发计划;
关键词：
Natural hydraulic lime; Polycarboxylate superplasticizer; Fluidity; Rheological properties; Particle distribution; Early hydration; PORTLAND-CEMENT; HISTORIC MASONRY; MORTARS; BEHAVIOR; TEMPERATURE; ADSORPTION; PERFORMANCE; IMPACT; DURABILITY; METAKAOLIN;
D O I：
10.1016/j.cemconcomp.2021.104052
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
As one of the main materials for grouting repair, the workability of natural hydraulic lime (NHL) has been concerned widely. In this paper, effects of polycarboxylate superplasticizer (PCE) on rheological properties and early hydration of natural hydraulic lime (NHL2) and their correlations were systematically investigated. Results show that the fluidity of NHL2 paste improves significantly and tends to a stable state at a certain dosage in the presence of PCE. It is found that PCE makes the flocculated structures in paste disassemble and produces more small particles. The results can lead to a decrease in yield stress and plastic viscosity, further improving rheological properties. The retardation effect of PCE on NHL2 hydration can depress the crystallization and early formation of calcium hydroxide Ca(OH)2 and calcium silicate hydrate (C-S-H). The effect can reduce water consumption during mixing, which has a positive influence on rheological properties.
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页数：10
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