Strength and Micro-structural Investigation on Geopolymer Concrete Developing with Reuse of Demolition Waste

This paper considers the depletion of mineral resources from the earth and global warming, so recycling construction and demolition waste (CDW) to develop geopolymer concrete (GPC) works is carried out. In this attempt, 80% of washed brick (BW) and concrete (CW) waste is reused to prepare GPC. Firstly, the X-ray fluorescence (XRF) analysis summarises the chemical composition in BW and CW. The alkaline activation 12 molarity sodium hydroxide and Na2SiO3 with an activator ratio of 1:1.5 was used to prepare concrete specimens. From CDW, the BW 0-40% was replaced to prepare GPC, and the CW 0-60% was replaced. The combination of BW and CW of up to 80% is used to prepare GPC. The compressive strength test, mode-1 fracture toughness test and impact resistance test were done to analyse the GPC strength. Based on trial mix results, the optimum replacement percentage was 30% for washed BW and 50% for washed CW. The SEM analysis examines the internal bonding of the particles in GPC.