The 4th Asian Concrete Federation Symposium on Emerging Technologies for Structural Longevity (ACF2023- ETSL)

290 / 2023-02-12 21:33:46

Development of ultra-lightweight low-carbon LC3 cement composites (ULLC-LC3): mechanical performances, chloride resistance, carbonation resistance and life cycle assessment

Ultra-,Limestone calcined clay cement,Durability performances,Life cycle assessment

Ultra-lightweight cement composites (ULCC) are characterized by low density and high specific strength. However, the wide application of ULCC has been limited by a large amount of Portland cement content. Limestone and calcined clay cement (LC3) is a promising eco-friendly cementitious material, in which limestone and calcined clay (LC2) are used to partially replace Portland cement for reducing carbon footprint. This paper introduces the development of a novel cement composite, namely ultra-lightweight low-carbon LC3 cement composites (ULCC-LC3) by partially replacing Portland cement in ULCC with LC2. Experiments were conducted to investigate the effects of mix design on mechanical performances, resistances towards chloride ion penetration and CO2 ingression, and the carbon footprint of the composites. The experimental results indicate that ULCC-LC3 has favorable mechanical performances and better chloride resistance and sustainability performance as compared with its ULCC counterpart.