Indonesia Conference Directory

In recent decades, fly ash has been used as a substitute cementitious material (SCM) in doses of more than 50%. Because fly ash has a lower reactivity than cement, the high-volume fly ash replacement causes a relatively large decrease in strength. One way to anticipate this is the addition of alkali activators. A mixture of ordinary Portland cement (OPC), fly ash and alkali activator is so called as hybrid alkaline cement. This research observed the differences in hydration along with the change in dose activator. The precursors were composed of 20% OPC and 80% fly ash. The difference in hydration reaction was observed by scanning electron microscopy (SEM) technique. The results of the study recommend a maximum pH of a hybrid alkali is 12.08.