A review on durability performance of reinforcement bar in geopolymer paste compare with its performance in ordinary Portland cement paste

This paper presents the results of a study on the durability performance of the corrosion reinforcement bar in geopolymer manufactured using metakaolin and fly ash. Durability can be defined as the ability of the material to withstand the surrounding environment without any significant deterioration during their service life such as weathering action, chemical attack, abrasion, compressive strength, sorptivity and water absorption. This review will be focussing on compressive strength, water absorption and porosity of the geopolymer material. Geopolymer material is an alternative way to reduce carbon footprint as by using one tonne of Ordinary Portland Cement (OPC) will produce one tonne of carbon dioxide. Hence, metakaolin and fly ash geopolymer has been used to reduce this problem. Both types of geopolymers (metakaolin and fly ash) were synthesized with sodium silicate and potassium hydroxide solutions. The strength of the fly ash-based geopolymer increased, however, the strength of the corresponding metakaolin-based geopolymer decreased after similar exposure. The paper concludes that both types of geopolymers still gave a better result compare to OPC.