부산대학교 도서관

This study investigates the use of industrial wastes like Ground Granulated Blast-furnace Slag (GGBS) and Fly ash to make lightweight aerated Geopolymer concrete blocks. The concrete mix proportion of one-fourth of GGBS is used as binding material, and three-fourths of Fly ash is used as a Fine aggregate with suitable Alkaline Activator Solution (AAS). The GGBS and Fly ash are preliminarily tested for specific gravity before the trial mixes. To make the Geopolymer concrete blocks light-in-weight, the aluminium powder is added as an aerating agent, and it varies from 0.06%, 0.045%, and 0.03% to the weight of the binder, and 10M of NaOH solution is added with the Na2SiO3 solution as Alkaline Activator Solution. The fresh concrete in the cubes are cast and placed in oven at 60°C for 24 hours. The changes in the characteristic strength and density of the blocks are observed. The characteristic compressions strength, Water absorption, Density, and Ultrasonic pulse velocity tests are conducted as per IS 6441 & 13311 standards for Aerated concrete. For 0.06%, 0.045%, 0.03% of aluminium powder the observed characteristic compressive strength & density were 4.47 MPa & 1000 kg/m3, 6.05 MPa & 1160 kg/m3, 12.66 MPa & 1270 kg/m3 respectively. Also, the casted cubes are placed in ambient temperature, and the characteristic compressive strength of the ambient cured blocks is 3.77 MPa, 5.11 MPa, and 10.95 MPa for the same percentages of aluminium powder used in the concrete mix. [ABSTRACT FROM AUTHOR]