SEM images of CMUs showed microstructure composed of CSH, ettringite, Ca(OH) 2 along with poorly crystalline CaCO 3, wrapped between CSH.ĬMUs were able to uptake approximately 24% CO 2 by weight of cement. XRD and TGA confirmed substantial conversion of Ca(OH) 2 into CaCO 3. The microstructure studies on carbonation-cured CMUs revealed similar observations as found in microstructure testing of cement pastes and mortars ( El-Hassan and Shao, 2015). Carbonation curing had higher compressive strength than water cured specimens at all testing ages. Steam curing had the highest early age strength followed by carbonation curing and water curing. The results were compared with 4-h steam curing and water curing ( El-Hassan et al., 2014 El-Hassan and Shao, 2015). In the earlier studies by El-Hassan and Shao, CMUs were carbonation cured for 4 h followed by water spray till surface saturation. Several researchers examined the effect of ACC on performance of CMUs made with limestone cement and lightweight aggregate in different studies ( El-Hassan et al., 2014 El-Hassan and Shao, 2015 MacMaster and Tavares, 2015 Mahoutian and Shao, 2016 Shao et al., 2014b Xuan et al., 2016).

Worldwide application of CMUs provides huge scope for CO 2 sequestration with the help of ACC. CMUs represent a low environmental impact construction system and provide superior performance than cast in situ concrete ( El-Hassan et al., 2014). CMUs are used for construction of load-bearing walls. Shweta Goyal, Devender Sharma, in Start-Up Creation (Second Edition), 2020 6.4.2 Performance of concrete masonry unitsĬMUs are precast products made of plain concrete.

Nscp 2015 paverblock