Sequestration of carbon dioxide by RCAs and enhancement of properties of RAC by accelerated carbonation

With the growing public appreciation on environmental impacts, the carbon footprint impact of concrete has attracted much attention, especially relating to the production of cement. However, there is little information on the carbon dioxide (CO₂) sequestration potential of demolished and crushed concrete debris, as well as the contribution of carbonated recycled concrete aggregates (RCAs) to the performance of recycled aggregate concrete (RAC). In this chapter, an empirical model developed for predicting the CO₂ uptake associated with accelerated carbonation of RCAs is described. Furthermore, the mechanical properties and durability of RAC prepared with the carbonated RCAs are experimentally assessed in order to verify the positive influence of the carbonated RCAs on the performance of RAC.