耐久性
材料科学
胶凝的
水泥
碳化作用
复合材料
延展性(地球科学)
钙矾石
收缩率
复合数
包含能量
弹性(材料科学)
硅酸盐水泥
蠕动
热力学
物理
作者
Zhaoyi He,Duo Zhang,Tianyu Wang,Morgan McBain,Victor C. Li
标识
DOI:10.1016/j.cemconres.2021.106580
摘要
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. LC3-CSA-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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