Pengaruh Variasi Polyamide Fiber terhadap Sifat Mekanik Beton High Volume Fly Ash

Fitria, Aniyatul (2026) Pengaruh Variasi Polyamide Fiber terhadap Sifat Mekanik Beton High Volume Fly Ash. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Peningkatan pembangunan infrastruktur perkeretaapian di Indonesia mendorong pengembangan material beton yang memiliki kinerja mekanik tinggi serta ketahanan retak yang baik untuk mendukung perkembangan struktur seperti ballastless slab track. Beton High Volume Fly Ash (HVFA) merupakan salah satu alternatif beton ramah lingkungan karena memanfaatkan fly ash sebagai substitusi sebagian semen. Namun, penggunaan fly ash dalam jumlah tinggi dapat menurunkan kuat awal dan ketahanan retak beton. Salah satu upaya untuk mengatasi permasalahan tersebut adalah dengan penambahan polyamide fiber yang mampu meningkatkan daktilitas dan menghambat propagasi retak melalui mekanisme crack bridging. Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi kadar polyamide fiber terhadap sifat mekanik beton HVFA dengan substitusi fly ash sebesar 50%. Metode penelitian dilakukan secara eksperimental dengan kadar variasi penambahan polyamide fiber sebesar 0%, 0,5%, 0,75%, dan 1% dari volume total. Parameter mekanik yang dianalisis meliputi workability, kuat tekan (ASTM C39/C39M, 2015), modulus elastisitas (ASTM C469/C469M, 2014), kuat tarik belah (ASTM C496/C496M, 2011), fracture energy (JCI-S-001, 2003), dan pola retak. Penelitian menggunakan masing – masing tiga silinder beton 100 x 200 mm untuk kuat tekan, modulus elastisitas, dan kuat tarik belah, serta tiga balok prisma berlekuk 150 x150 x 550 mm untuk pengujian fracture energy. Hasil penelitian menunjukkan bahwa peningkatan kadar polyamide fiber menyebabkan penurunan workability beton dari 270 mm pada PA 0 menjadi 170 mm, 130 mm, dan 80 mm pada variasi fiber 0,5%, 0,75% dan 1%. Variasi polyamide fiber sebesar 0,5% menghasilkan kuat tekan tertinggi sebesar 67,17 MPa dengan modulus elastisitas sebesar 33290 MPA, sedangkan variasi 1% menghasilkan kuat tarik belah tertinggi sebesar 5,36 MPa dengan rasio ft/fc terbesar sebesar 12,52%, fracture energy sebesar 1816,61 N/m dan menghasilkan pola retak yang lebih daktail akibat mekanisme fiber bridging dan fiber pull-out. Hubungan antara kuat tekan dan modulus elastisitas menunjukkan korelasi yang kuat dengan nilai R² = 0,9071, sedangkan hubungan antara kuat tekan dan kuat tarik belah menghasilkan R² = 0,5291. Berdasarkan evaluasi hasil pengujian, campuran PA 0,5 memberikan keseimbangan performa terbaik, sedangkan PA 1 menunjukkan ketahanan retak paling tinggi. Oleh karena itu, beton HVFA dengan penambahan polyamide fiber berpotensi untuk dikembangkan sebagai material beton struktural yang memerlukan ketahanan retak yang baik, dengan tetap mempertimbangkan bahwa pengujian fatigue, beban siklik, shrinkage, durabilitas, dan pengujian pada elemen slab belum dilakukan.
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The rapid development of railway infrastructure in Indonesia has increased the demand for concrete materials with high mechanical performance and excellent crack resistance to support the construction of structures such as ballastless slab tracks. High Volume Fly Ash (HVFA) concrete is considered an environmentally friendly alternative due to its utilization of fly ash as a partial cement replacement. However, the use of high fly ash content may reduce the early-age strength and crack resistance of concrete. One approach to overcome these limitations is the incorporation of polyamide fiber, which improves ductility and inhibits crack propagation through crack-bridging mechanisms. This study aimed to evaluate the effect of polyamide fiber content on the mechanical properties of HVFA concrete containing 50% fly ash as a cement replacement. An experimental study was conducted using polyamide fiber contents of 0%, 0.5%, 0.75%, and 1.0% by total concrete volume. The investigated mechanical properties included workability, compressive strength (ASTM C39/C39M-15), modulus of elasticity (ASTM C469/C469M-14), splitting tensile strength (ASTM C496/C496M-11), fracture energy (JCI-S-001, 2003), and crack pattern. The experimental program employed three cylindrical specimens (100 x 200 mm) for compressive strength, modulus of elasticity, and splitting tensile strength tests, as well as three notched beam specimens (150 x 150 x 550 mm) for fracture energy testing. The results indicated that increasing the polyamide fiber content reduced the workability of HVFA concrete from 270 mm for PA 0 to 170 mm, 130 mm, and 80 mm for fiber contents of 0.5%, 0.75%, and 1.0%, respectively. The mixture containing 0.5% polyamide fiber exhibited the highest compressive strength of 67.17 MPa and the highest modulus of elasticity of 33.29 GPa. Meanwhile, the mixture containing 1.0% polyamide fiber achieved the highest splitting tensile strength of 5.36 MPa, the highest tensile-to-compressive strength ratio (12.52%), a fracture energy of 1,816.61 N/m, and a more ductile crack pattern due to the fiber-bridging and fiber pull-out mechanisms. The relationship between compressive strength and modulus of elasticity showed a strong correlation with an R² value of 0.9071, whereas the relationship between compressive strength and splitting tensile strength yielded an R² value of 0.5291. Based on the overall evaluation, the 0.5% polyamide fiber mixture provided the best balance of mechanical performance, while the 1.0% polyamide fiber mixture exhibited the greatest crack resistance. Therefore, HVFA concrete reinforced with polyamide fiber has significant potential for structural applications requiring enhanced crack resistance. Nevertheless, further investigations on fatigue behavior, cyclic loading, shrinkage, durability, and full-scale slab track structural performance are recommended.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	High Volume Fly Ash, polyamide fiber, sifat mekanis, fracture energy, pola retak, High Volume Fly Ash, polyamide fiber, mechanical properties, fracture energy, crack pattern
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA1637 Image processing--Digital techniques. Image analysis--Data processing. T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA440 Concrete--Cracking. T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction T Technology > TD Environmental technology. Sanitary engineering > TD427.F58 Fly ash
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Aniyatul Fitria
Date Deposited:	03 Aug 2026 02:45
Last Modified:	03 Aug 2026 02:45
URI:	http://repository.its.ac.id/id/eprint/141817

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