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Parmin Lumbantoruan
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Effect of palm fiber volume fraction for enhancing the physical and mechanical properties of epoxy composites Kartika Sari; Sunardi -; Yazid Zainur Isnen; Agung Bambang Setio Utomo; Parmin Lumban Toruan; Ampala - Khoryanton
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5692

Abstract

Reinforcing materials such as fiber; are most widely used to give new properties to composites. This study investigates the effect of palm fiber (Arenga pinnata) volume fraction on the physical and mechanical properties of epoxy-based composites. Composite specimens with 0% and 2.5% fiber volume fractions were fabricated, maintaining a uniform thickness of 2 mm. The fabrication process involved fiber extraction, mixing with epoxy resin, and controlled curing. The physical properties assessed included density, porosity, and water absorption, while mechanical testing involved tensile and bending tests. The results demonstrated that the 2.5% fiber-reinforced composite exhibited improved properties compared to the 0% fiber composite. The density increased from 5.85 g/cm³ to 13.43 g/cm³, while porosity and water absorption rose slightly to 0.40% and 0.03%, respectively. In mechanical testing, the tensile strength increased from 2.64 MPa to 6.29 MPa, while strain improved from 1.06% to 4.59%. Young’s modulus, however, decreased from 2.49 MPa to 1.37 MPa, indicating enhanced flexibility. The bending stress increased from 6.35 MPa to 10.85 MPa, and deflection improved from 1.45 mm to 7.35 mm. These findings indicate that incorporating 2.5% palm fiber provides an optimal balance between strength and flexibility, making it a promising reinforcement for lightweight composite applications.
Kemampuan Variasi Campuran Sekam Padi Pada Batako Terhadap Peredaman Suhu Parmin Lumban Toruan; Heru Prasetio; Rahmawati Rahmawati
Jurnal Deformasi Vol. 7 No. 2 (2022): JURNAL DEFORMASI
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/deformasi.v7i2.9176

Abstract

ABSTRAK Penggunaaan batako sebagai material penyusun bangunan lebih menguntungkan dari pada penggunaan batu bata dikarenakan batako lebih mudah dan cepat dalam pemasangannya. Ketahanan suhu (panas) merupakan salah satu faktor dari kualitas batako. Salah satu cara untuk meningkatkan ketahanan panas (suhu) pada batako adalah dengan menambahkan campuran pembuatannya, salah satunya sekam padi. Sekam padi berpotensi meningkatkan ketahanan panas dikarenakan memiliki kandungan silika. Limbah sekam padi banyak didapatkan dari pertanian di masyarakat, namun pemanfaatan limbah sekam padi pada batako  masih sangat kurang. Penelitian ini bertujuan menganalisis peredaman suhu pada batako dengan campuran sekam padi. Metode yang digunakan yaitu pendekatan eksperimen yang diawali dengan survei lokasi limbah sekam padi dan pengambilan sampel sekam padi di penggilingan padi Pegayut. Tahapan selanjutnya dilakukan penelitian secara eksperimen di laboraturium. Batako yang digunakan dengan variasi campuran sekam padi 0,1 , 0,2  dan 0,3 dari komposisi penggunaan semen.  Telah dilakukan penelitian untuk mengetahui redaman panas pada batako dengan meletakkan alat pemanas pada salah satu sisi batako lalu diukur suhunya dan pada sisi yang lain  setelah memvariasikan waktunya  dari 0 menit sampai 15 menit dengan rentang waktu masing masing 5 menit. Hasil dari penelitian menunjukkan bahwa peredaman suhu terbesar berada pada batako dengan campuran 30% sekam padi diwaktu 5 menit peredamannya sebesar 75,025oC, waktu 10 menit peredam suhu nya 79,282oC dan diwaktu 15 menit peredaman suhunya sebesar 82,275oC. Berdasarkan analisis faktorial bahwa campuran sekam padi 30% adalah batako dengan peredaman suhu yang terbaik                 ABSTRACT The use of bricks as a building material is more profitable than the use of bricks because bricks are easier and faster to install. Temperature resistance (heat) is one that affects the quality of bricks. One way to increase the heat resistance (temperature) of adobe bricks is to add a mixture of its manufacture, one of which is rice husk. Rice husk has the potential to increase heat resistance because it contains silica. Rice husk waste is mostly obtained from agriculture in the community, but the use of rice husk waste in bricks is still very less.. This study aims to analyze the temperature damping on adobe bricks with a mixture of rice husks. The method used is an experimental approach that begins with a survey of rice husk waste locations and sampling of rice husks at the Pegayut rice mill. The next stage was carried out experimentally in the laboratory. The bricks used were mixed with rice husk variations of 0.1, 0.2 and 0.3 of the composition used for cement. Research has been carried out to determine the attenuation of heat in bricks by placing a heating device on one side of the bricks and then measuring the temperature and on the other side after varying the time from 0 minutes to 15 minutes with with a time span of 5 minutes each. The results of the study showed that the greatest temperature attenuation was in bricks with a mixture of 30% rice husk at 5 minutes the damping time was 75.025 oC, 10 minutes at 79.282 oC and 15 minutes at 82.275 oC. Based on the factorial analysis, the 30% rice husk mixture is the brick with the best temperature damping
The Effect Of Porosity On The Critical Temperature Of Porous Alumina Ceramics Asep Saputra; Parmin Lumban Toruan; Atina Atina
Justek : Jurnal Sains dan Teknologi Vol 9, No 3 (2026): September
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i3.40611

Abstract

Porous alumina ceramics are widely used in high-temperature applications due to their thermal stability; however, they are vulnerable to thermal shock, which may induce microcrack formation due to thermal stress. Although the influence of porosity on thermal shock resistance has been widely investigated, numerical studies on its effect on the critical cracking temperature remain limited. This study aims to analyze the effect of porosity on the critical temperature of porous alumina ceramics under thermal shock using a Finite Difference Method (FDM) simulation. Porosity variations of 10%, 20%, 30%, and 40% were considered. Thermal shock was modeled by applying a sudden temperature of 2000 K on one side of the material, while the initial temperature was set at 300 K. The resulting temperature distributions were used to evaluate thermal stress and determine the critical temperature for each porosity level. The results show that increasing porosity reduces the maximum thermal stress from 265 MPa at 10% porosity to 60 MPa at 40% porosity. The critical temperature increases from 533 K at 10% porosity to 663 K at 30% porosity, then decreases to 583 K at 40% porosity. These findings provide insight into the role of porosity in controlling thermal shock resistance and can support the optimization of porous alumina ceramics for high-temperature applications.
Co-Authors Agung Bambang Setio Utomo Alfarisa, Suhufa Ampala - Khoryanton Andi Arief Setiawan Arief Setiawan, Andi Asep Saputra Atina - Atina, Atina Charolina Sihombong, Sagita Erik Novaldo Erislah Erislah Erislah, Erislah Gelen Pranata Heru Prasetio Indah Safitri Joni Iswan Jumingin Jumingin Jumingin Jumingin Kartika Sari Niluh Rini Sri Wahyuni Rahmawati Rahmawati, Rahmawati rahmwati , Rifai, Dwi Ahmad Rika Noor Safitri Rini Sri Wahyuni, Niluh Setiawan, Andi Arif Suhufa Alfarisa Sunardi - Widya Rahmadani Wipsar Sunu Brams Dwandaru Yazid Zainur Isnen