Kaha, Marselina Niken (2024) Pengaruh Konsentrasi Aktivator Sodium Hidroksida dan Zone Agregat Halus 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 mortar without using portland cement as a basicmaterial, but using pozzolan materials in the form of fly ash, silica fume, rice huskash and other industrial materials that contain a lot of alumina (Al) and silica (Si) elements. To reduce the quantity of cement production, geopolymer mortar is the right solution in reducing 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 study aims to determine the effect of sodium hydroxide activator concentration and fine aggregate zone on the compressive strength of geopolymer mortar with fly ash as a substitute for cement.
In this study, 27 pieces of cube shaped geopolymer mortars were made 5 cmx 5 cm x 5 cm with varying concentrations of sodium hydroxide activators of 8 M,10 M, 12 M and fine aggregate zones namely zone 1, zone 2, zone 3 and zone 4. Compressive strength testing was carried out at the age of 28 days using the Compressive Strenght of Hydraulic Cement Mortar test kit. Tests based on ASTMC109 on Standard Test Method for Comprehensive Strength of Hydraulic CementMortars.
The highest result of geopolymer mortar compressive strength testing was obtained at 40.50 Mpa with the use of 8 M sodium hydroxide activator concentration in zone 2 fine aggregate and the lowest result of geopolymer mortar compressive strength testing was obtained 21.00 Mpa with the use of 6 M sodium hydroxide activator concentration in zone 1 fine aggregate.

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