Abstract
Selecting a preferred material among a pool of alternatives to perform as desired is a crucial task for promoting sustainability. Evaluation of material performance considering subjectivity and conflicting criteria is the major concern of stakeholders in the construction and is a Multi-Criteria Decision problem. Investigating the sustainable performance of Supplementary Cementitious Material (SCM) considering multi-dimensional and interdependent target-based criteria is the major concern in decision making. The present study has developed an approach, Sustainable Preference Index (SPI) in selecting the optimum sustainable cementitious material considering fresh and hardened properties, durability, service life and Life-Cycle Cost (LCC) aspects. A case study has been considered to illustrate the approach by varying Fly ash (FA) and Ground Granulated Blast Furnace Slag (GGBS) by 20%, 30%, and 40% of the weight of cement in Self Compacting Concrete (SCC). Among the seven mixes, the sustainable alternative in SCC could be identified based on the SPI. For the alternative GGBS 40% based SCC, the highest SPI is found to be 0.893, which is 30.2% more sustainable than the conventional SCC. This simple and lucid approach will facilitate designers and engineers to prioritize and choose a right cementitious material to achieve sustainability.
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