Relationship between morphology analysis and durability of geopolymer paste

Abstract

Geopolymer may improve corrosion protection by slowing the corrosion of steel in concrete or paste. When the alkalinity of the paste is reduced, the passivating layer is destroyed. If the paste is more pores, it can be easily absorbed by NaCl solution or moisture. The improved properties of the geopolymer paste increase its durability by preventing corrosive elements from harming the steel contained within the geopolymer paste. Two types of paste were used in this research which geopolymer paste and Ordinary Portland Cement (OPC) paste. A Scanning Electron Microscope (SEM) was used to determine the surface morphology of geopolymer paste and OPC paste. Based on the result of this investigation, the morphology characterisation is related to the concrete’s endurance. The formation of an aluminosilicate gel during the geopolymerisation process is critical for stability, increasing the geopolymer matrix’s density. As a result, this can increase the durability of geopolymer paste compared to OPC paste which geopolymer also can improve corrosion protection of steel in paste.