Mechanical and micro-structural properties of perlite powder incorporated SCC

Abstract

Abstract Self-compacting concrete (SCC) is widely used for the construction of large-scale buildings due to its high workability and self-compacting characteristics. But all SCC mix, not only shows a reduction in strength at elevated temperatures, but also has the risk of spalling. Materials such as Perlite Powder (PP) as a partial replacement of cement and Silica Fume (SF) and / or Ground Granulated Blast Furnace Slag (GGBS) were used as additives to overcome these shortcomings. The quantity of Perlite Powder (PP) was varied as 2%, 4%, and 6% and the SCC mix was prepared using a carboxylate-based super plasticizer. They were tested at temperatures ranging from room temperature to 600⁰ C (i.e., 27⁰, 200⁰, 400⁰, and 600⁰ C). The present study aims to find the optimum dosage of PP that offers maximum resistance under elevated temperatures. The samples with the optimum dosage of PP were then subjected to X-Ray Diffraction (XRD) test and Field Emission Scanning Electron Microscope (FESEM) test for phase identification and microstructural characterization respectively. Modulus of elasticity was done for the SCC with the optimum dosage of 4% PP replacement. The durability tests such as the water absorption and porosity tests were performed to assess its durability.