PENGARUH VARIASI MOLARITAS NaOH TERHADAP SIFAT MEKANIK, POROSITAS, DAN PERMEABILITAS PADA BETON POROUS GEOPOLIMER

ALPAJRI, MUHAMMAD RIDHO and Adhitya, Bimo Brata (2025) PENGARUH VARIASI MOLARITAS NaOH TERHADAP SIFAT MEKANIK, POROSITAS, DAN PERMEABILITAS PADA BETON POROUS GEOPOLIMER. Undergraduate thesis, Sriwijaya University.

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Abstract

This study aims to analyze the effect of NaOH molarity variation (13 M, 14 M, 15 M, 16 M, 17 M) on the mechanical properties, porosity, and permeability of fly ash-based geopolymer porous concrete. The experimental method involved casting cylindrical samples (Ø10 cm × 20 cm) using coarse aggregates (9.5–12.5 mm), an alkali activator/fly ash ratio of 0.45, and oven curing at 80°C for 24 hours. Results indicated that 15 M NaOH yielded optimal compressive strength of 9.10 MPa (28 days) and split tensile strength of 3.60 MPa (28 days), with a porosity of 28.0340% and permeability of 1.4147 cm/s. Increased NaOH molarity enhanced geopolymer matrix density due to improved reactivity of silica (SiO₂) and alumina (Al₂O₃) in fly ash. However, molarities >15 M reduced compressive strength due to alkali segregation. Permeability values met ACI 522R-10 standards (0.14–1.22 cm/s), while porosity remained within the acceptable range (15–35%). This study recommends 15 M NaOH for sustainable geopolymer porous concrete applications in infrastructure.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	geopolymer porous concrete, NaOH molarity, compressive strength, split tensile strength, permeability, porosity
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials > TA418.9.C6.B538 Composite materials. Polymeric composites. Fibrous composites. Biomass chemicals. TECHNOLOGY & ENGINEERING / Material Science. SCIENCE / Chemistry / General
Divisions:	03-Faculty of Engineering > 22201-Civil Engineering (S1)
Depositing User:	MUHAMMAD RIDHO ALPAJRI
Date Deposited:	24 Mar 2025 02:45
Last Modified:	24 Mar 2025 02:45
URI:	http://repository.unsri.ac.id/id/eprint/169972

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