TY - JOUR
T1 - Assessing the sustainability potential of alkali-activated concrete from electric arc furnace slag using the ECO2 framework
AU - Hafez, Hisham
AU - Kassim, Dany
AU - Kurda, Rawaz
AU - Silva, Rui Vasco
AU - de Brito, Jorge
N1 - Funding Information:
The authors gratefully acknowledge the support of the Portuguese Foundation for Science and Technology and CERIS Research Institute, Instituto Superior Técnico, Universidade de Lisboa.
PY - 2021/4/26
Y1 - 2021/4/26
N2 - Alkali-activated materials are regarded as a potential sustainable building material with industrial by-products fully replacing ordinary Portland cement. Five million tonnes of electric arc furnace slag are produced annually mostly to be recycled as low value aggregates in several construction applications. This study examined the possibility of valorising the understudied slag as a precursor in alkali-activated concrete. The material, supplied free and available in abundance as a waste, presents a significant potential to produce sustainable concrete. Hence, the mechanical and durability properties of electric arc furnace slag-based alkali-activated concrete were examined. After that, using a sustainability assessment framework called ECO2, the combined whole-life cycle assessment of the environmental and economic impact was calculated for several mixes that combined electric arc furnace slag and fly ash as precursors. The increasing amount of slag content led to a decline in mechanical performance, though there was an equivalent durability-related performance; mixes with electric arc furnace slag showed equivalent slump and resistance to carbonation, and enhanced resistance to chloride ion penetration. Furthermore, slag-based concrete exhibited significant improvement in the overall ECO2 sustainability score due to its minimal environmental and economic impact.
AB - Alkali-activated materials are regarded as a potential sustainable building material with industrial by-products fully replacing ordinary Portland cement. Five million tonnes of electric arc furnace slag are produced annually mostly to be recycled as low value aggregates in several construction applications. This study examined the possibility of valorising the understudied slag as a precursor in alkali-activated concrete. The material, supplied free and available in abundance as a waste, presents a significant potential to produce sustainable concrete. Hence, the mechanical and durability properties of electric arc furnace slag-based alkali-activated concrete were examined. After that, using a sustainability assessment framework called ECO2, the combined whole-life cycle assessment of the environmental and economic impact was calculated for several mixes that combined electric arc furnace slag and fly ash as precursors. The increasing amount of slag content led to a decline in mechanical performance, though there was an equivalent durability-related performance; mixes with electric arc furnace slag showed equivalent slump and resistance to carbonation, and enhanced resistance to chloride ion penetration. Furthermore, slag-based concrete exhibited significant improvement in the overall ECO2 sustainability score due to its minimal environmental and economic impact.
KW - Alkali-activated concrete
KW - CO
KW - Electric arc furnace slag
KW - Life cycle assessment
KW - Sustainability
KW - Sustainable concrete
UR - https://www.scopus.com/pages/publications/85101386517
U2 - 10.1016/j.conbuildmat.2021.122559
DO - 10.1016/j.conbuildmat.2021.122559
M3 - Article
AN - SCOPUS:85101386517
SN - 0950-0618
VL - 281
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 122559
ER -
