Effects of curing procedures on the strength and permeability of cementitious composites incorporating GGBFS

Abstract

In this study, the effects of curing procedures on properties of samples incorporating ground granulated blastfurnace slag (GGBFS) were examined. The replacement levels by GGBFS were 0, 35, 50 and 65% by mass of cement. Three different curing methods were used: water, air and steam curing. Permeability as well as compressive and flexural strength was measured to determine performances of the samples. Test results indicated that steam curing greatly helped the development of both compressive and flexural strength for the samples incorporating GGBFS in the early ages. However, a reverse trend was observed at later ages. It was also found that the beneficial effect of steam curing became more significant in terms of permeability as the GGBFS content increased. Additionally, air curing has potentially a negative effect on the mechanical properties of both control and GGBFS blended samples due to a lack of the moisture availability for hydration. Based on the test results, thus, it can be concluded that the use of GGBFS holds promise in the production of precast concrete elements taking into consideration economical and mechanical factors.