MUHAMMAD AZKA ABDULLAH, NIM. 112022066 (2026) PENGARUH VARIASI LARUTAN ALKALI AKTIVATOR (LIQUID) TERHADAP PREKURSOR (SOLID) PADA MORTAR GEOPOLIMER BERBASIS FLY ASH. Skripsi thesis, Universitas Muhammadiyah Palembang.

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Abstract

The use of geopolymer mortar as an alternative to conventional Portland cement–based mortar has gained increasing attention due to the demand for environmentally sustainable construction materials. Geopolymer mortar utilizes aluminosilicate-rich materials such as fly ash, activated by alkaline solutions to form a binding matrix through geopolymerization. Recent studies have shown that the ratio of alkaline activator to precursor plays a crucial role in determining microstructure, density, and compressive strength. Therefore, identifying the optimum ratio is essential to achieve superior mechanical performance and sustainability. This study employed an experimental approach using fly ash–based geopolymer mortar. The independent variable was the alkaline activator–to–precursor ratio, varied at 0.4:1, 0.45:1, 0.5:1, 0.55:1, and 0.6:1. The activator consisted of sodium silicate (Na₂SiO₃) and sodium hydroxide (NaOH) with a fixed ratio of 2.5:1 and a NaOH molarity of 14 M. The dependent variables were density and compressive strength tested at curing ages of 14, 21, and 28 days. Specimens of 5 × 5 × 5 cm were oven-cured at 60°C for 24 hours. The results indicate that the activator ratio significantly influences both density and compressive strength. An optimum ratio produced a denser matrix and the highest compressive strength, while excessive activator content reduced performance due to increased porosity and imbalance in geopolymerization. This study confirms that controlling the activator ratio is essential for developing high-performance and sustainable geopolymer mortar.

Item Type:	Thesis (Skripsi)
Additional Information:	1. Mira Setiawati, S.T., M.T. 2. Adji Sutama, S.T., M.T.
Uncontrolled Keywords:	Geopolymer Mortar, Alkaline Activator, Fly Ash, Compressive Strength, Density
Subjects:	Teknik Sipil > Bahan-bahan Bangunan Teknik Sipil > Konstruksi dalam Bahan-bahan Khusus
Divisions:	Fakultas Teknik > Teknik Sipil (S1)
Depositing User:	Mahasiswa Fakultas Teknik
Date Deposited:	04 May 2026 06:41
Last Modified:	04 May 2026 06:41
URI:	http://repository.um-palembang.ac.id/id/eprint/35377

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