Long-term stable and sustainable high-strength engineered cementitious composite incorporating limestone powder

被引：31
|
作者：
Yu, Kequan [1 ,2 ]
Lin, Manfang [1 ]
Tian, Likang [1 ]
Ding, Yao [3 ]
机构：
[1] Tongji Univ, Coll civil Engn, Shanghai, Peoples R China
[2] South China Univ Technol, State Key Lab Subtrop Bldg Sci, Guangzhou, Peoples R China
[3] Chongqing Univ, Coll civil Engn, Chongqing, Peoples R China
来源：
STRUCTURES | 2023年 / 47卷
基金：
中国博士后科学基金;
关键词：
High -strength engineered cementitious; composite; Limestone powder; Long-term mechanical properties stability; Sustainability; Micromechanical model; FILLER CEMENT; STEADY-STATE; FLY-ASH; HYDRATION; STRAIN; PERFORMANCE; CONCRETE; DESIGN; MICROSTRUCTURE; SUBSTITUTION;
D O I：
10.1016/j.istruc.2022.10.008
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
High-strength engineered cementitious composite (HS-ECC) features low water-to-binder ratio and high-volume cement may result in time-dependent increase of matrix fracture toughness, loss of tensile ductility and high environmental impact. Inert limestone powder (LP) partially replacing cement can stabilize the long-term matrix fracture toughness of HS-ECC. In this study, the impacts of high-level replacement of cement with LP on the short-(28 d) and long-term (360 d) microstructure and mechanical properties of HS-ECC were investigated. Despite lower compressive strength, the tensile properties of HS-ECC with higher LP content were found to be more stable. The composite tensile properties can be traced to the fiber/matrix interface properties via a micromechanical model. The stability function of LP on the long-term tensile properties of HS-ECC was exper-imentally and theoretically verified. Further, the high-level replacement of cement with LP notably enhanced the sustainability of HS-ECC.
引用
收藏
页码：530 / 543
页数：14
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