Setting time of coconut fiber ash-based geopolymer binder

Abstract This watchfulness goal is to decide the beginning and ending binding of geopolymer binders using coconut fiber ash (CFA). Experiments were carried out by comparing effects ratio precursors base activators on binders. The precursor material derived from CFA, which consists 8.24% silicon dioxide, 2.3% diphosphate pentaoxide, 70.6% potassium oxide, 2.25% iron 14.1% chlorine. Using two types alkaline activators, namely NaOH (SH) with a molar concentration 14M Na 2 SiO 3 (SS), used as solution in manufacturing process. A comparison activator mixtures three variations, 70%:30%, 75%:25%, 80%:20%, SS/SH 1:1, 1.5, 2:1 weight. specimens are cast vicat ring top bottom diameters ∅60mm ∅70mm, well height 40mm. setting time test standard SNI 2049:2015. results showed that times binder got shorter P/A higher, 5%–20% decreased average.