Abstract
This study aims to determine the effect of precursor and activator proportion on the setting time of the geopolymer binder. The precursor used was Umeanyar slate stone powder containing SiO2 (49%), Al2O3 (11%), CaO (11.2%). While the activator used was a mixture of 14 M sodium hydroxide (NaOH) solution and sodium silicate (Na2SiO3). The proportion of precursor: activator (P/A) in the geopolymer binder were 70%: 30%; 75%: 25%; 80%: 20% and those of Na2SiO3 : NaOH (SS/SH) were 1:1; 1.5:1; 2:1, by weight. The setting time of the binders was tested according to the SNI 2049: 2015. Measurement of setting time using vicat test equipment and based on normal consistency. The measurement of the setting time was carried out every 15 minutes until the initial bonding time was reached. The initial and final setting time result of the geopolymer binder decreased to 75 minutes and 100 minutes when P/A, as well as, SS/SH increased.
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