Brahi, Venansius (2023) Pengaruh Konsentrasi dan Rasio Aktivator Sodium Hidroksida, Rasio Fly Ash-Aktivator terhadap Kuat Tekan Mortar Geopolimer yang Memakai Fly Ash sebagai Pengganti Semen. Undergraduate thesis, Fakultas Teknik Universitas Merdeka Malang.

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Abstract

Geopolymer mortar is a mortar that does not use Portland cement as a base material, but uses pozzolanic materials in the form of fly ash, silica fume, rice husk ash and other industrial materials which contain lots of alumina (Al) and silica (Si). To reduce the quantity of cement production, geopolymer mortar is the right solution to reduce carbon dioxide in the air. Geopolymer mortar is not bound with water but uses activators, namely sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) to form polymerization bonds. The research aims to determine the effect of concentration and ratio of sodium hydroxide activator, fly ash-activator ratio on the compressive strength of geopolymer mortar using fly ash as a cement substitute. In this study, 54 pieces of geopolymer mortar were used in the form of cubes of 5 cm x 5 cm x 5 cm with varying concentrations of sodium hydroxide activator, namely 6M, 8M and 10M, sodium silicate-sodium hydroxide ratios of 2:1 and 3:2, fly ash ratios. -activator 70%:30%, 60%:40% and 50%:50%. The compressive strength test was carried out at the age of 28 days using a Compressive Strength of Hydraulic Cement Mortar tester. Testing based on ASTM C109 regarding Standard Test Method for Comprehensive Strength of Hydraulic Cement Mortars. The highest yield of the geopolymer mortar compressive strength test was obtained at 48.17 MPa with the use of 8M sodium hydroxide activator concentration, at a sodium silicate-sodium hydroxide ratio of 2:1 and a fly ash-activator ratio of 70%:30%. The lowest result of geopolymer mortar compressive strength test was obtained 13 MPa with the use of 8M sodium hydroxide activator concentration at a sodium silicate-sodium hydroxide ratio of 3:2 and a fly ash-activator ratio of 50%:50%.

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