Compressive strength and microstructural analysis of recycled coarse aggregate concrete treated with silica fume

被引：44
作者：
Zhu, Lihua [1 ,2 ]
Ning, Qiujun [1 ]
Han, Wei [1 ]
Bai, Leilei [1 ]
机构：
[1] Xian Univ Architecture & Technol, Sch Civil Engn, 13 Yanta Rd, Xian 710055, Peoples R China
[2] Xian Univ Architecture & Technol, State Key Lab Green Bldg Western China, 13 Yanta Rd, Xian 710055, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 334卷
关键词：
Silica fume; Recycled aggregate concrete; Compressive strength; Microstructure; Interfacial transition zone; MECHANICAL-PROPERTIES; DURABILITY; CEMENT;
D O I：
10.1016/j.conbuildmat.2022.127453
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Recycled coarse aggregate(1) (RCA) was treated with silica fume cement(2) (SFC) paste. Subsequently, specimens of two types of concrete were prepared: one with treated RCA(3) (TRCA) and another with natural coarse aggregate(4) (NCA) based on conventional concrete(5) (CC) mixture designs. The slump, cubic, and prism compressive strengths of the two concretes were compared and analyzed. Moreover, the microstructures of these two concretes were qualitatively analyzed using scanning electron microscopy(6) (SEM) and energy-dispersive spectroscopy(7) (EDS). The results showed that the mechanical performance of TRCA concrete(8) (TRCAC) was improved significantly. The enhanced strength of this recycled aggregate concrete(9) (RAC) is mainly due to the incorporation of silica fume, which can improve the quality of RCA and reduce the thickness of the interfacial transition zone(10) (ITZ) of RAC.
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页数：14
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