Simplified life cycle analysis for rigid pavements constructed using waste materials as binders in concrete
by Janitha Migunthanna; Navya Tumakuru Manjunatha; Varun Gulappa Shatagar; Dhanush Hirisave Raghu; Rakesh Shamantbhai Zinzala; Pathmanathan Rajeev; Jay Sanjayan
International Journal of Student Project Reporting (IJSPR), Vol. 1, No. 2, 2022

Abstract: A simplified life cycle analysis (LCA) was conducted to evaluate and compare the environmental performance of ordinary Portland cement (OPC)-based concrete and geopolymer concrete (GPC) in rigid pavement construction. Environmental impacts were evaluated by quantifying carbon dioxide (CO₂) emissions and energy consumption related to the different LCA stages. In an OPC concrete mixture, the cement binder was responsible for almost 70% of CO₂ emissions and 88% of energy consumption. Replacing OPC in concrete with geopolymer binders allowed reducing total CO₂ emissions by almost 50% and energy consumption by 72%. In this study, waste clay bricks (WCBs), fly ash and slag were used as the aluminosilicate precursors and anhydrous sodium silicate was used as the activator to produce one-part GPC. The case study results show that for a 1 km rigid pavement construction, the total CO₂ emission and energy consumption can be reduced by 39% and 63%, respectively, by replacing OPC with geopolymer binders.

Online publication date: Thu, 02-Feb-2023

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