Karakteristik dan Sifat Mekanik Mortar Geopolimer Berbahan Dasar POFA dan GGBFS terhadap Paparan Suhu Tinggi

Abstract

Urban areas are usually dominated by multi-storey buildings which have a higher risk of damage if a fire occurs. The use of Portland cement in concrete produces CO2 gas emissions. The increase in greenhouse gases such as CO2 results in climate change. To reduce carbon emissions from cement use, you can use geopolymer technology which has the advantage of being resistant to high temperatures. This will be in line with realizing the SDGs. This study aims to examine the characteristics and mechanical properties of geopolymer mortar made from POFA and GGBFS with varying molarities of 8M, 10M, 12M and 14M NaOH which were left at room temperature for 28 days and 56 days then fired for 4 hours at a temperature of 1000℃. After burning, the test object was cooled by immersing it for 30 seconds before the compression test was carried out. There were 144 test objects with varying POFA and GGBFS ratios of 100:0, 90:10, 80:20, 70:30, 60:40 and 50:50. Based on the research results, it was found that the maximum compressive strength occurred in the PG55 variation with a ratio of POFA 50%: GGBFS 50% at a molarity of 12M NaOH with a treatment age of 28 days of 36.00MPa. The average decrease in maximum density occurred in the PG55 variation by 11.66% in variations that had more GGBFS content. The use of more POFA in mortar causes a relatively long setting time, an insignificant decrease in density after firing and a low workability value.