期刊
CEMENT AND CONCRETE RESEARCH
卷 149, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2021.106580
关键词
Engineered Cementitious Composites (ECC); Limestone calcined clay cement (LC3); Calcium sulphoaluminate cement (CSA); Expansion; Shrinkage; Self-stress; CO2
资金
- Center for Low Carbon Built-Environment (CLCBE)
- US Department of Energy, Advanced Research Projects Agency-Energy (ARPA-e) [DE-AR0001141]
This research developed a low carbon self-stressing ECC using LC3 and CSA, which has a lower carbon footprint and similar embodied energy compared to conventional concrete, while also possessing durability, high ductility, and self-stressing functionality.
Engineered Cementitious Composites (ECC) is an emerging cementitious composite material with ultra-high ductility. However, its higher cement dosage limits its material greenness and leads to concerns with drying shrinkage. In this research, an ECC utilizing limestone calcined clay cement (LC3) and calcium sulphoaluminate cement (CSA) is investigated, focusing on minimizing the material's embodied carbon while enhancing its durability with intrinsic self-stressing functionality. A self-stressing criterion is theoretically established and experimentally verified. X-ray diffraction patterns reveal an ettringite quantity that modulates the initial expansion and later expansion-reversal of LC3-CSA-ECC to support a persistent self-stressing mechanism. LC3CSA-ECC has a lower (64%) carbon footprint and similar embodied energy compared to conventional concrete. When combined with the durability advantage (tiny crack, high ductility of 5.5%, and self-stressing function), this low carbon self-stressing ECC holds promise as a sustainable repair material that lowers the embodied and operational carbon in civil infrastructure.
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