Nango, Sebastiana Beo (2023) Pengaruh Konsentrasi Aktivator Sodium Hidroksida dan Rasio Agregat Halus-Binder terhadap Kuat Tekan Mortar Geopolymer yang Memakai Fly Ash sebagai Pengganti Semen. Undergraduate thesis, Fakultas Teknik Universitas Merdeka Malang.

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Abstract

Geopolymer mortar is a mortar without using Portland cement as a base material, but using pozzolanic materials such as fly ash, silica fume, rice husk ash and other binders that contain alumina (Al) and silica (Si). To reduce the amount of cement production, geopolymer mortar is a good solution to reduce the amount of carbon dioxide in the air. Geopolymer mortars do not bond to water but use sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) as activators to create polymer bonds. The purpose of this study was to determine the effect of sodium hydroxide activator concentration and the ratio of sodium silicate and sodium hydroxide activator on the compressive strength of geopolymer mortar that uses fly ash as a cement substitute. The aim of this study was to produce the compressive strength of fly ash-based geopolymer mortar with 27 cube-shaped specimens of 5 cm x 5 cm x 5 cm with sodium hydroxide activator concentrations of 6M, 8M, 10M. Fine aggregate-binder ratio 50%:50%, 60%:40%, 75%:25%. Fly ash-activator ratio 70%:30. Compressive strength testing was carried out at 28 days of age using a Compressing Testing Machine (CTM) test equipment based on ASTM C109 concerning the Standard Test Method for Compressive Strength of Hydraulic Cement Mortars. The results of the research show that the highest compressive strength of geopolymer mortar is found at a fine aggregate-binder ratio of 50%:50% of 48.33 Mpa with a sodium hydroxide concentration of 8M, while the lowest average compressive strength value is found at a fine aggregate-binder ratio of 75%: 25% of 11.83 Mpa with a sodium hydroxide concentration of 10M.

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