USE OF CARBON DIOXIDE AS A CURING AGENT FOR CONVENTIONAL CONCRETES

Abstract

This paper summarizes the results of an investigation on carbon dioxide (CO2) sequestration in concrete. Carbon dioxide (CO₂) is the predominant greenhouse gas resulting from human industrial Activities. A significant fraction of CO₂ discharged into the atmosphere comes from Industry point sources. Cement production alone contributes approximately 5% of global CO₂ emissions. This emitted carbon dioxide, however, can be partially recycled into concretes through early age curing to form thermodynamically stable calcium carbonates. The carbonation reaction between carbon dioxide and appropriate calcium Compounds results in permanent fixation of the carbon dioxide in a thermodynamically stable calcium carbonate. Carbon dioxide and water can be found in almost every environment and thus all concretes will be subjected to carbonation. This paper summarizes a recent study on optimization of concrete and the flue gas carbon dioxide collected from cement kiln can be beneficially utilized in concrete production to reduce carbon emission, accelerate early strength, and improve durability of the products. Cement industry contributes to 5% of global CO2 emissions. To mitigate pollution, there is a need of CO2 sequestration into stable forms. Present research focusses on CO2 being channelized towards an important construction practice. This paper summarizes the potential of CO2 absorption in concrete. In reference to cement content, carbon uptake in 4-hour carbonation reaches 28 days strength achieved by conventional curing method.