Analysis of Geopolymer Mortar Compressive Strength Based on Fly Ash and GGBFS as Patch Repair Material

Abstract Damages that often emerge in concrete include cracks, delamination, spalling, wear, fracture, porous, voids (perforated). These damages need to be repaired, one of which is by patch repair. With consideration strength and frugality, a self-made repair material was developed using mortar as base material, i.e., geopolymer mortar. Geopolymer with natural materials have high content silica oxide alumina (such Fly Ash GGBFS) binder must activated an alkaline activator the form sodium hydroxide (NaOH) silicate (Na 2 SiO 3 ). The use GGBFS replace cement has positive impact from environmental point view because it can reduce pollution due waste. In this research, effect variations molarity NaOH on compressive were investigated, order obtain optimum composition mixture meets requirements material. From results maximum occurred GF91 16 M at 56 days 73.77 MPa obtained. higher cheaper price when compared Sika Grout so better than terms frugality.