Pengaruh Variasi Substitusi High Volume Fly Ash (HVFA) Terhadap Workability, Sifat Mekanik, Dan Durabilitas Beton

Hayati, Septya Nurmala (2026) Pengaruh Variasi Substitusi High Volume Fly Ash (HVFA) Terhadap Workability, Sifat Mekanik, Dan Durabilitas Beton. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Industri semen menyumbang emisi karbon dioksida yang besar, sehingga diperlukan beton dengan penggunaan semen Portland yang lebih rendah. Beton High Volume Fly Ash (HVFA) menggunakan fly ash dalam proporsi tinggi sebagai pengganti semen dan berpotensi meningkatkan efisiensi material sekaligus durabilitas beton. Penelitian ini menganalisis pengaruh substitusi fly ash sebesar 40%, 50%, dan 60% terhadap workability, kuat tekan, porositas, permeabilitas udara, resistivitas listrik, dan ketahanan terhadap penetrasi ion klorida, dengan beton Ordinary Portland Cement (OPC) sebagai kontrol.Penelitian dilakukan secara eksperimental pada empat variasi campuran (OPC, HVFA40, HVFA50, HVFA60), menggunakan rasio air-binder 0,25 untuk HVFA dan 0,29 untuk OPC. Pengujian meliputi slump, kuat tekan (7, 14, 28 hari), porositas (ASTM C642), permeabilitas udara (metode Torrent), resistivitas listrik, dan RCPT (ASTM C1202) untuk perbandingan OPC dan HVFA50.Hasil menunjukkan pengaruh substitusi fly ash yang tidak linear. Nilai slump OPC, HVFA40, HVFA50, dan HVFA60 masing-masing 170 mm, 130 mm, 150 mm, dan 190 mm, dengan kuat tekan 28 hari sebesar 54,24 MPa, 52,20 MPa, 56,87 MPa, dan 35,96 MPa. HVFA50 menunjukkan kinerja terbaik, dengan porositas terendah (5,87%), permeabilitas udara terendah ($0,012 \times 10^{-16} \text{ m}^2$), resistivitas tertinggi ($83,31 \text{ k}\Omega\cdot\text{cm}$), dan nilai RCPT turun 87,64% (dari 662,819 menjadi 81,892 coulomb), sehingga kategorinya berubah menjadi dapat diabaikan. Sebaliknya, substitusi 60% menurunkan kuat tekan dan meningkatkan porositas akibat berkurangnya semen aktif dan produk hidrasi. Secara keseluruhan, HVFA50 merupakan variasi optimum karena mengurangi penggunaan semen sekaligus memberikan keseimbangan terbaik antara workability, kuat tekan, dan durabilitas beton.
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The cement industry contributes significantly to carbon dioxide emissions, creating a need for concrete with lower Portland cement content. High Volume Fly Ash (HVFA) concrete uses fly ash in high proportions to replace cement, potentially improving material efficiency and durability. This study analyzes the effect of fly ash substitution at 40%, 50%, and 60% on workability, compressive strength, porosity, air permeability, electrical resistivity, and chloride ion penetration resistance, using Ordinary Portland Cement (OPC) concrete as the control.The research used four mix variations (OPC, HVFA40, HVFA50, HVFA60), with a water-to-binder ratio of 0.25 for HVFA and 0.29 for OPC. Testing covered slump, compressive strength (7, 14, 28 days), porosity (ASTM C642), air permeability (Torrent method), electrical resistivity, and RCPT (ASTM C1202) comparing OPC and HVFA50.Results show a non-linear effect of fly ash substitution. Slump values for OPC, HVFA40, HVFA50, and HVFA60 were 170 mm, 130 mm, 150 mm, and 190 mm, with 28-day compressive strengths of 54.24 MPa, 52.20 MPa, 56.87 MPa, and 35.96 MPa. HVFA50 performed best, with the lowest porosity (5.87%), lowest air permeability ($0.012 \times 10^{-16} \text{ m}^2$), highest resistivity ($83.31 \text{ k}\Omega\cdot\text{cm}$), and an 87.64% drop in RCPT value (from 662.819 to 81.892 coulombs), shifting its classification to negligible. In contrast, 60% substitution reduced compressive strength and increased porosity due to reduced active cement and hydration products. Overall, HVFA50 is the optimum mix, reducing cement use while offering the best balance of workability, compressive strength, and durability.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	High Volume Fly Ash, workability, kuat tekan; porositas, permeabilitas udara, resistivitas listrik, penetrasi ion klorida. =========================================================== High Volume Fly Ash, workability, compressive strength, porosity, air permeabilit, electrical resistivity, chloride ion penetration
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials.
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Septya Nurmala Hayati
Date Deposited:	03 Aug 2026 02:12
Last Modified:	03 Aug 2026 02:12
URI:	http://repository.its.ac.id/id/eprint/141877

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