Comparison of Geopolymer Paver Block Using Natural Aggregate and Recycled Aggregate as Fine Aggregate and Slag as Coarse Aggregate

Abstract

An approximate 400-500 million metric tons of fly ash is generated annually from thermal power plant. The maximum use of fly ash is necessary for the sustainable development. In this research, it attempted to develop a method for manufacture of paver block using fly ash based geopolymer technology. The influence of ratio of alkaline solution and fly ash on geopolymer paver block studied. The fly ash, fine aggregate, coarse aggregate mixed with alkaline solution of 14 molar concentration of NaOH and cured at 90°C temperature. The paver blocks casted for different Na2SiO3/NaOH ratio using natural aggregate and recycled aggregate as fine aggregate and slag as coarse aggregate. Paver blocks tested for compressive strength, flexural strength, water absorption, abrasion resistance. The study results compared against geopolymer paver block using natural aggregate and recycled aggregate as fine aggregate and slag as coarse aggregate. The geopolymer paver block with recycled aggregates having mix proportion as GPC4 showed all the test results within limit as per IS15658, hence it can be used in residential driveways, light vehicles/public pedestrian and light vehicle paths.