Ikotun, Jacob OlumuyiwaAlexander, M.G.Beushausen, H.Dehn, F.Moyo, P.2025-02-272025-02-272018Ikotun, J.O. 2018. Effects of concrete quality and natural Johannesburg environment on concrete carbonation rate. MATEC Web of Conferences, 199: 1-6. doi:10.1051/matecconf/2018199020082261-236X (Online)https://hdl.handle.net/10321/5797This study presents the results of a project undertaken to study the combined effects of concrete quality (binder type, w/b, and duration of initial moist curing) and natural Johannesburg environment on carbonation rate of concretes containing 100% PC, 35% fly ash (FA), 50% ground granulated blast-furnace slag (BS), 10% silica fume (SF) and (30% BS + 10% SF). The results show that apart from the SF blended concretes, the carbonation rate of the SCM blended concretes are higher than the PC concretes. Reducing the w/b and increasing the duration of initial moist curing reduced the carbonation rate in the concretes. The indoor exposed concretes have the highest carbonation rates and reducing the w/b ratio is more efficient and sustainable in lowering the carbonation rate rather than extending the duration of the initial moist curing.6 penConcreteCarbonation rateArticle2025-02-1310.1051/matecconf/201819902008