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

Abstract

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.

Keywords:

• Pervious concrete
• accelerated carbonation curing
• void content
• permeability
• interlocking paver blocks

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Buildings Construction Corporation under grant sanction No: NBCC/ED(R&D)/LOI/2020/01; the All India Council For Technical Education under grant sanction no: 8-183/RIFD/RP S(P OLICY-1)/2018-19.

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