Perbandingan Nilai Setting Time Mortar Geopolimer dengan Material Organik Berdasarkan Kandungan Kalsium dan Rasio Alkalin Aktivator
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Abstract
Organic waste from food industry incineration can be used as a partial or complete replacement of cement in geopolymer mortars, as it contains silica (Si), alumina (Al) and calcium (Ca). The aim of this research is to analyse the calcium content of organic wastes and its effect on the setting time of geopolymer mortars. In this research, 3 types of organic wastes, rice husk ash, palm oil ash (POFA) and sugarcane bagasse ash were used. The ratio of alkali activator to material is 1:1.8, 1:2.0 and 1:2.2. The alkali activator consists of 10M NaOH and Na2SiO3 and the ratio of Na2SiO3/NaOH is 1:3.5. Material testing includes XRD, XRF and the setting time of the mortar, which is tested for 24 hours from the start of mixing. Based on the test results, the calcium content of the rice husk ash, palm oil ash (POFA) and bagasse ash samples was found to be 0.55%, 8.01% and 1.48% respectively. All samples fall into the low calcium material category, with POFA having the highest calcium value. Thus, the three samples showed loss of setting time or no setting within 24 hours. The POFA material shows little evidence of beginning to cure after 24 hours, but is still classified as having lost setting time. The conclusion of this research is that relatively low calcium levels in organic wastes have a slow polymerisation reaction characterised by no setting time (lost setting time).
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