Optimization of Alkali Activator Solution to Enhance the Performance of Roller Compacted Concrete for Pavements

Abstract

Due to the recent inclination towards reducing greenhouse gases (GHG), less energy-intensive construction, and reuse of waste and secondary materials, this study focuses on maximizing the mechanical performance of environment-friendly roller compacted concrete for pavements (RCCP). Alkali-activated roller compacted concrete for pavements (AA-RCCP) is prepared in this study by alkali activation of ground granulated blast furnace slag (GGBFS) and fly ash (FA). The use of an alkali activator solution with varying density and viscosity for alkali activation further complicates this research since roller-compacted concrete (RCC) is extremely sensitive to moisture. Five distinctive molarities of NaOH and three varying proportions of Na2SiO3 for each morality were used to develop 15 mix designs that were tested to maximize the performance of AA-RCCP. Fresh properties such as optimum moisture content (OMC) and maximum dry density (MDD) were first evaluated for each mix formulation. The effect of variation in alkali activator solution on hardened properties like compressive strength, flexural strength, and split tensile were studied. In addition, the effect of varying alkali activator dosages, dry density, void ratio, delay in compaction, and curing age on compressive strength was also evaluated. Based on the findings of the tests conducted in this study, AA-RCCP can be considered an environment-friendly alternative option for the construction of pavement and other facilities.