Effect of limestone waste on the hydration and microstructural properties of cement-based materials

被引：0
|
作者：
Ji, Guangxiang [1 ]
Chi, Huihai [2 ,3 ]
Sun, Keke [4 ]
Peng, Xiaoqin [2 ]
Cai, Yamei [4 ]
机构：
[1] Chongqing Jiaotong Univ, Sch River & Ocean Engn, Chongqing 400074, Peoples R China
[2] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400045, Peoples R China
[3] Guizhou Construct Sci Res & Design Inst Ltd Co CSC, Guiyang 550006, Peoples R China
[4] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong 999077, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2024年 / 443卷
关键词：
Limestone waste; Calcite; Cement mortar; Net reaction heat; Microstructural properties; PORTLAND-CEMENT; MANUFACTURED SAND; TERNARY BLENDS; SILICA FUME; STRENGTH; POWDER; SUPERPLASTICIZERS; COMPOSITES; MECHANISMS; MORTARS;
D O I：
10.1016/j.conbuildmat.2024.137784
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The benefits of limestone waste as a partial replacement of cement have been well established. In this paper, to better understand the effect of limestone waste on the properties of cement-based materials, the hydration process and microstructural properties of cement are evaluated. The results showed that the limestone waste decreased the fluidity of cement mortar, while the mortar having up to 10 % limestone waste provided competitive properties with pure cement mortar. It is concluded that the presence of limestone waste has both negative and positive effects simultaneously on the hydration and microstructural properties of the cement paste. During the hydration process, the net reaction heat of limestone waste in the cement blends ranged from 0.38 J/g to 4.1 J/g. In addition, the thermodynamic modeling and XRD indicated that the monocarbonate and hemicarbonate were stable in the limestone-cement blends, and the limestone waste increased the stability of ettringite.
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页数：10
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