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Life Cycle Assessment of Conventional and Self Compacting Concrete- A Cradle to Grave Approach

Abstract

Concrete is widely used construction material all over the world. The  environmental issues related to concrete production have been a concern for long time. Concrete production is known to be energy intensive and heavily dependent on natural resources like limestone and natural aggregates. Additionally, the production of cement, which is a crucial raw material for concrete, generates a significant amount of CO2.  To cut down these impacts it is important to understand the whole life cycle of concrete. The present research performs a  cradle-to-grave Life Cycle Assessment (LCA) of concrete to provide insight into each and every stage associated with it. For analysis study develops an Excel-based tool using data from Indian regions. The evaluation compares conventional concrete with Self Compacting Concrete (SCC). The evaluation examines the impact of cement type, mix design proportions, and End-of-Life (EOL) scenarios on overall outcomes. The findings  demonstrate that replacing Ordinary Portland Cement (OPC) with blended cements such as Portland Pozzolana Cement (PPC) and Portland Slag Cement (PSC) can significantly diminish the environmental impact of conventional concrete. It cuts the amount of clinkers by 58% and Global Warming Potential (GWP) by 40%, However the results are not similar for SCC. The PPC based SCC required almost double the binder content to achieve necessary strength and workability. This mix has 27% higher GWP and 23% higher production cost than the OPC + fly ash based mix.  This outcome shows that choosing an alternative cement type and replacing OPC alone does not ensure better performance unless the quantities are carefully optomized.

Keywords

Life Cycle Assessment (LCA), Conventional Concrete, Self-Compacting Concrete (SCC), Global Warming Potential (GWP), Supplementary Cementitious materials (SCMs)

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Author Biography

Tarak Voraa

Civil Engineering Department


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