study of compressive and chloride resistance of alkali activated mortar made from fly ash and waste glass powder

Abstract

This article presents an experiential study of properties of alkali activated mortar using a binder made from fly ash and waste glass powder. The ratio of fly ash and waste glass powder were 90:10, 80:20, and 70:30 and sodium hydroxide (NaOH) with a concentration of 10M and sodium silicate (Na₂SiO₃) at ratio of 1:1 was used as alkali activator. The study examined the fresh mortar properties, including flowability. The compressive strength of mortar was tested at 7, 28 and 90 days. The corrosion resistance was tested by impressive voltage at 28 days. The results showed that using a higher proportion of waste glass powder to replace fly ash increased the flowability of the mortar. For compressive strength of mortar, it was found that higher amounts of waste glass powder led to a reduction in compressive strength. However, the used of 90% of fly ash and combined with 10% of waste glass powder could enhance the compressive up to 539.1 ksc at 90 days. Moreover, all of alkali activated fly ash and waste glass powder mortar showed higher corrosion resistance than Portland cement mortar.