CO2 Curing of Reactive Powder Concretes Modified by Waste Limestone Powder

Incorporating waste stone powders into the production of reactive powder concretes (RPCs) can be eco-friendly. Since high cementitious material content is used in producing RPCs, CO2, as a harmful greenhouse gas, was for carbonation curing this study. For purpose, limestone substituted by 0%, 18%, 36% and 54% silica sand specimens were cured water up to 90 days CO2 chamber 48 hours. The physical mechanical properties concrete specimens' uptake measured at different ages. Results showed that 28-day compressive strength moist RPCs higher than 100 MPa improved increasing substitution. significantly increased samples' limestone-powder substitution decreased autogenous shrinkages RPCs. Moreover, make eco-friendly limestone-modified where their are improved. KEYWORDS: curing, Reactive concrete, Waste powder, Shrinkage.