Influence of Curing Conditions on Strength of Alkali Activated Mortar Made from High Calcium Fly Ash and Low Calcium Fly Ash
DOI: 10.14416/j.ind.tech.2023.12.004
Keywords:
Alkali activated, High calcium fly ash, Low calcium fly ash, Compressive strength, Heat curingAbstract
This research aims to study the effect of curing conditions on the strength development of mortar made from alkali-activated fly ash with different calcium contents, which consist of high calcium fly ash and a combination of high and low calcium fly ash. The setting time and the development of compressive strength of the alkali-activated fly ash mortar under curing at ambient temperature and a temperature of 80 oC for 24 hours were investigated. The experimental results found that the calcium content in precursors affected the setting time, with higher calcium content resulting in a faster setting time. Using a blend of high and low calcium fly ash as a binder provided a longer setting time than the binder made with only high calcium fly ash. The alkali-activated mortar made with high calcium fly ash as a binder had higher strength than the blend of high and low calcium fly ash at ambient temperature. For the curing temperature of 80 oC, the binder made from high calcium fly ash had lower strength than the blend of high and low calcium fly ash. The compressive strength of alkali-activated mortar made from high calcium fly ash and low calcium fly ash in a 50:50 ratio with a curing temperature of 80 oC was 151, 168, 187 and 189 kg/cm2 at 7, 28, 45, and 60 days, respectively.
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