Uptake of Carbon Dioxide in the Demolished and Crushed Concrete

Abstract

This study examined the uptake of CO₂ in the demolished and crushed concrete by conducting an exposure experiment using crushed mortar and crushed concrete. The results of the experiment show that CO₂ uptake increases significantly when the particle size is small and when repeatedly wetted and dried. The uptake of CO₂ in concrete rubble obtained from intermediate processing factories was also examined. The amount of CO₂ uptake in one ton of concrete rubble was estimated to be 11 kg. Using this value, the life cycle CO₂ (LCCO₂) of reinforced concrete was calculated and shown to be about 5.5% less than the uptake of CO₂ compared with a case that did not consider it.