HIGH EARLY STRENGTH OF SELF-CONSOLIDATING CONCRETE INCORPORATING QUA-SI-RHA

Self-consolidating concrete (SCC) is an innovative construction material that can be placed into forms without mechanical vibration and able to flow and consolidate under its own weight, and completely fill the formwork even in the presence of dense reinforcement. Self-consolidating concrete, a latest innovation in concrete technology is being regarded as one of the most promising developments in the construction industry due to numerous advantages of it over conventional concrete. The use of mineral additives in SCC was also found to produce other advantages such as enhancement of SCC properties in fresh and hardened states, reuse of industrial and agricultural by products in concrete production and reduction of greenhouse gases into the atmosphere. Thus, the incorporation of Qua-Si-RHA which are the combination of Quarry Dust (Qua), Silica Fume (Si) and Rice Husk Ash (RHA) as supplementary cementitious material and fine aggregate replacement in SCC was investigated. The high-range superplasticizer, water reducer was used as the chemical admixtures which can enhance the rheological properties of concrete.This study presents the results of a laboratory investigation of conventional vibrated concrete and SCC with eco-friendly and sustainable materials. The workability test and compressive strength test were conducted to determine properties of fresh and hardened conventional concrete and SCC. The early strength of conventional and SCC concrete cubes were tested after 24 hours of casting. As expected, the innovation material incorporating Qua-Si-RHA in SCC resulted in high workability performance and high early strength self-consolidating in concrete.