Strength and permeation characteristics of pervious concrete subjected to accelerated carbonation curing

This study aims to investigate the influence of accelerated carbonation curing (ACC) on strength and permeation characteristics of pervious concrete. ACC envisaged well for CO2 sequestration in concrete. Pervious concrete is considered to be better recipient for CO2 curing due to presence of high interconnected pores. Carbonation of pervious concrete is deeper and homogeneous in comparison to normal concrete. Experimental results show that accelerated carbonation curing at 12-hour effectively improves strength of pervious concrete. Also, application-based interlocking pervious paver blocks subjected to 12-hour ACC provide the highest strength of 23.36 MPa. Permeation characteristics were found to be in optimum range despite of decrease in permeability due to the formation of CaCO3 in specimens subjected to ACC. Microstructural analysis also suggested intermingled matrix of CaCO3 and CSH gel. TGA revealed higher CO2 uptake for longer duration of ACC specimens, suggesting sequestration of CO2 in pervious concrete compare to conventional concrete.