Analisis Optimalisasi Metode Curing Terhadap Perilaku Mekanik Mortar Geopolimer Berbasis Fly ash dengan Variasi Aktivator dan Molaritas NaOH. (Analysis of Curing Method Optimization on the Mechanical Behavior of Fly Ash-Based Geopolymer Mortar with Variations in Activators and NaOH Molarity)

Rahmawan, Fatih Nur (2026) Analisis Optimalisasi Metode Curing Terhadap Perilaku Mekanik Mortar Geopolimer Berbasis Fly ash dengan Variasi Aktivator dan Molaritas NaOH. (Analysis of Curing Method Optimization on the Mechanical Behavior of Fly Ash-Based Geopolymer Mortar with Variations in Activators and NaOH Molarity). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.

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Abstract

Geopolymer is an environmentally friendly concrete material whose main component is formed from pozzolan. One of the most determining factors in the successful formation of geopolymer concrete is the molarity of the sodium hydroxide (NaOH) solution and the ratio of the activator composition. Geopolymer concrete generally requires a relatively high activation temperature of around 60℃ to increase the compressive strength of the concrete, making it quite difficult to implement on a large scale. This study aims to analyze the effect of variations in NaOH molarity (8M and 12M), the NaOH/Na₂SiO₃ activator ratio (1:1 and 1:2), and curing methods (water curing, wrap curing, and moist curing) on the mechanical behavior of fly ash-based geopolymer mortar. The research method uses cube-shaped test specimens with curing methods including water curing, moist curing, and wrap curing. The tests include setting time of the paste, compressive strength at 7 days and 28 days, and water absorption at 28 days. The research results show that variations in molarity and activator ratio significantly affect the initial and final setting times, where the combination of 8M NaOH with a 1:1 ratio results in the fastest setting time with an initial setting time of 33.19 minutes and a final setting time of 70 minutes. In contrast, the combination of 12M NaOH with a 1:2 ratio results in the longest setting time with an initial setting time of 52.40 minutes and a final setting time of 90 minutes. From the compressive strength perspective, at 7 days, the water curing method produced the highest compressive strength in the 12M NaOH variation with a 1:1 ratio, with a value of 27.47 MPa. Meanwhile, at 28 days, the wrap curing method showed the highest compressive strength in the 12M NaOH variation with a 1:1 ratio, with a value of 49.05 MPa. This indicates that the curing method has an influence on geopolymer, maintaining moisture without using additional water, reducing leaching, and resulting in long-term effectiveness. In the water absorption test, the lowest value was obtained with the 8M NaOH variation at a 1:2 ratio, which was 7.37%, and the highest value was with the 8M NaOH variation at a 1:1 ratio, which was 8.44%. The Name of Student : Fatih Nur Rahmawan Number of Student : 1432200077 Study Program : Civil Engineering Supervisor : Ir. Bantot Sutriono, M.Sc xii results of this test indicate that increasing the Na₂SiO₃/NaOH ratio can enhance the formation of N-A-S-H gel as the main structure in the geopolymer. The formation of more gel will result in a denser microstructure, thereby reducing porosity and the material's ability to absorb water.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Aktivator, Geopolimer, Metode Perawatan, Molaritas, Perilaku Mekanik
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Fakultas Teknik > Program Studi Teknik Sipil
Depositing User:	1432200077 Fatih Nur Rahmawan
Date Deposited:	18 Aug 2026 03:41
Last Modified:	18 Aug 2026 03:41
URI:	http://repository.untag-sby.ac.id/id/eprint/47024

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