The use of low-carbon-footprint filler in highperformance concrete

The substitution of fine fillers in self-consolidating high-performance concrete (SCHPC) makes superplasticiser (SP) an essential admixture in concrete technology with recent advancements. The dosage of SP needs to be in controls to produce superior concrete properties such as high passing ability, high flowability and low segregation. This can be reached by carefully choosing the filler type and quantity, in addition to the other ingredients in the mix design of (SCHPC). With these in mind, passing ability and structural stability can be improved over the concrete mixes with only cement in their powder composition. In this study, inert limestone fine filler (LS) was selected to substitute cement partially, and the passing ability with the overall flowability-segregation performance of concrete investigated. From the outcomes, it was evident that when LS is added, it increases the concrete desire to superplasticiser lubrication and dispersion effort ensuing denser wet packing density, which in turn could boost concrete passing ability and cohesiveness. More importantly, with the optimum substitution of cement by non-cementitious limestone filler, maximum passing ability can be achieved through the development of the concurrent flowability-segregation resistance performance of concrete. This can facilitate improvements in rheology and sustainability, which may, extend design life, cut construction cost and preserve energy.