The use of scrap tyres in construction materials has been promoted to curb the environmental exploitation caused by the open disposal of non-biodegradable waste rubber. Tyre grinds as aggregates in geopolymer concrete (GPC) would increase its sustainability value by reducing the consumption of natural aggregates. Although there is limited literature addressing the damage to GPC charac... https://www.roneverhart.com/Lifestyle-Mobility-Aids-P2-Portable-Oxygen-Concentrator-with-Carry-Case/