PENGARUH MORALITAS NATRIUM HIDROKSIDA TERHADAP KUAT TEKAN DAN POROSITAS MORTAR RINGAN GEOPOLIMER
DOI:
https://doi.org/10.30595/techno.v26i1.22069Keywords:
Activator, mortar, geopolymer, pumice sand, tidoreAbstract
Lightweight mortar is an alternative for developing  lightweight material innovations as a form of prevention against damage caused by earthquakes. Cement production is the biggest contributor to global warming, namely 1 ton of CO2 residue per 1 ton of OPC production. So environmentally friendly material innovation is needed in the field of materials engineering, namely using fly ash as a binder to replace cement as well as using waste. The concentration of alkali activator greatly influences the strength of the mortar. Therefore, it is necessary to conduct research to determine the characteristics of geopolymer mortar with certain variations of activator so that information about the optimum mixture can be obtained and the compressive strength and porosity values of lightweight geopolymer mortar can be determined. This research aims to determine the effect of varying levels of activator (NaOH) in a mixture of light geopolymer mortar with varying concentrations of 7 M, 8M, 9M, and 10M on the compressive strength and porosity of light geopolymer mortar. The number of 5 cm x 5 cm x 5 cm cube test objects was 48 for testing compressive strength and porosity. Testing uses a Testing Machine and scales with wire baskets. The research results show that the greater the molarity of NaOH, the greater the compressive strength value. In light geopolymer mortar with 7 molarity the average compressive strength is 0.4 MPa, while at 8 molarity the compressive strength value is 0.87 MPa, at 9 molarity it is 1.70 MPa, at 10 molarity it is 2.27 MPa. So it was found that the highest compressive strength was when using NaOH of 10 molarity. On the other hand, the higher the molarity, the lower the porosity value. In light geopolymer mortar with 7 molarity the average compressive strength is 35.225%, while at 8 molarity the compressive strength value is 28.025%, at 9 molarity it is 26.269%, at 10 molarity it is 26.172%. So it was found that the highest porosity value was when NaOH was used at 7 molarity.
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