Issue 2, 2021

Punching above its weight: life cycle energy accounting and environmental assessment of vanadium microalloying in reinforcement bar steel

Abstract

Steel-reinforced concrete is ubiquitously used in construction across the world. The United Nations estimates that the worldwide energy consumption of buildings accounts for 30–40% of global energy production, underlining the importance of the judicious selection of construction materials. Much effort has focused on the use of high-strength low-alloy steels in reinforcement bars whose economy of materials use is predicated upon improved yield strengths in comparison to low-carbon steels. While microalloying is known to allow for reduced steel consumption, a sustainability analysis in terms of embodied energy and CO2 has not thus far been performed. Here we calculate the impact of supplanting lower grade reinforcement bars with higher strength vanadium microalloyed steels on embodied energy and carbon footprint. We find that the increased strength of vanadium microalloyed steel translates into substantial material savings over mild steel, thereby reducing the total global fossil carbon footprint by as much as 0.385%. A more granular analysis pegs savings for China and the European Union at 1.01 and 0.19%, respectively, of their respective emissions. Our cradle-to-gate analysis provides an accounting of the role of microalloying in reducing the carbon footprint of the steel and construction industries and highlights the underappreciated role of alloying elements.

Graphical abstract: Punching above its weight: life cycle energy accounting and environmental assessment of vanadium microalloying in reinforcement bar steel

Supplementary files

Article information

Article type
Paper
Submitted
06 Okt 2020
Accepted
09 Des 2020
First published
10 Des 2020

Environ. Sci.: Processes Impacts, 2021,23, 275-290

Author version available

Punching above its weight: life cycle energy accounting and environmental assessment of vanadium microalloying in reinforcement bar steel

P. Pradeep Kumar, D. A. Santos, E. J. Braham, D. G. Sellers, S. Banerjee and M. K. Dixit, Environ. Sci.: Processes Impacts, 2021, 23, 275 DOI: 10.1039/D0EM00424C

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