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All Journal Jurnal Ilmu Pertanian Indonesia Jurnal Teknologi Industri Pertanian J-Sil (Jurnal Teknik Sipil dan Lingkungan) Jurnal Ilmu dan Teknologi Hasil Hutan Forum Pasca Sarjana Teknik Mesin "TEKNOLOGI" Jurnal Keteknikan Pertanian Indonesian Journal of Forestry Research Jurnal Penelitian Hasil Hutan Jurnal Matematika & Sains Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Jurnal Teknik Sipil Journal of Architectural Research and Design Studies Jurnal Rekayasa Sipil Gorontalo Journal of Forestry Research Jurnal Ilmu dan Teknologi Kayu Tropis PERENNIAL ULIN: Jurnal Hutan Tropis Jurnal Penelitian Hasil Hutan Wood Research Journal : Journal of Indonesian Wood Research Society Wood Research Journal : Journal of Indonesian Wood Research Society Indonesian Journal of Physics (IJP) Indonesian Journal of Forestry Research Jurnal Penelitian Hasil Hutan J-Sil (Jurnal Teknik Sipil dan Lingkungan) Biodiversitas Journal of Biological Diversity
Naresworo Nugroho
Departemen Hasil Hutan, Fakultas Kehutanan Dan Lingkungan, Institut Pertanian Bogor, Bogor 16153
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Transportation

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Evaluation of Web Diameter, Flange Thickness, and Adhesive Type on the Physical and Mechanical Properties of Siam Bamboo I-Joist Lastiur Eva Panggabean; Naresworo Nugroho; Wayan Darmawan; Dede Hermawan; Anggun Thevianni; Khairunnisa Iskandar Putri
Jurnal Ilmu Pertanian Indonesia Vol. 31 No. 3 (2026): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18343/jipi.31.3.486

Abstract

This study investigates the effect of geometric and adhesive variables on the physical and mechanical properties of I-joist beams using Siam bamboo (Thyrsostachys siamensis) as the web and Acacia mangium as the flange. The research combines two experimental studies focusing on (1) the influence of web diameter (3 cm and 4 cm) and flange thickness (2, 2,5, and 3 cm), and (2) the effect of adhesive type (epoxy and polyurethane) and penetration depth (½, ¾, and full thickness of flange). All materials were conditioned to 12–14% moisture content before fabrication. Physical testing included moisture content and density, while mechanical testing consisted of flexural strength (MOE and MOR), tensile withdrawal strength, and failure mode analysis. Results showed that increasing web diameter and flange thickness contributed to higher density, MOE, and MOR values, with the best performance observed at 3 cm diameter and 3 cm flange thickness. Meanwhile, using epoxy adhesive with ¾ penetration depth significantly improved bonding strength and stiffness, achieving MOE values up to 22,361 kgf/cm² and MOR up to 132 kgf/cm². The most common failure modes were flange cracking and web detachment, particularly in beams with shallow penetration and larger diameters. This combined investigation confirms that optimizing geometric configuration and joint adhesion can significantly enhance the structural performance of bamboo-based I-joists, offering a viable solution for eco-friendly construction. Keywords: bamboo I-joist, web dimension, adhesive, mechanical performance, sustainable construction
Ultrastructure of royal palm (Roystonea regia) leaf sheath ULFA ADZKIA; NARESWORO NUGROHO; ISKANDAR Z. SIREGAR; Lina Karlinasari
Biodiversitas Journal of Biological Diversity Vol. 21 No. 3 (2020)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d210316

Abstract

Abstract. Adzkia U, Nugroho N, Siregar IZ, Karlinasari L. 2020. Ultrastructure of royal palm (Roystonea regia) leaf sheath. Biodiversitas 21: 967-974. The royal palm (Roystonea regia (Kunth) F.Cook is one of the palm species that are many planted along the streets as part of urban landscapes. As biologically products, in nature they can self-cleaning with drop off their big leaves. The study aims to examine the morphological characteristics of ultrastructure and elemental content, crystallinity, as well as fibers derivation characteristics from the royal palm. The samples were taken out from leaf sheaths that divided into three sections along the width of i.e. outside, middle, and inside; in two conditions of leaf sheaths namely green and brownish-dry. The morphology structure and elemental content were observed by the Scanning Electron Microscopy (SEM) and the Energy Dispersive X-ray analysis (EDX), while the crystallinity was analyzed using X-ray diffraction (XRD), and fiber characteristics were measured to determine cell dimensions as well as to calculate Runkle ratio (RR), muhlsteph ratio (MR), coefficient of rigidity (CR), felting powder (FP), and flexibility ratio (FR). The diameter of palm fiber bundles was decreased from outside towards inside. The model of vascular tissue was rounded which located in the central region of the fiber bundles. The silicon content in the inside section was lower than those in the middle and outside sections. It was in line with the degree of crystallinity in the inside section which that higher than other sections. The highest degree of crystallinity was about 18 %. The fiber length of royal palm leaf sheath was in values around 6000 ?m. However, the royal palm leaf sheath had thick fiber walls and thin lumen, as well as other fiber derivation characteristics of muhlsteph ratio, the coefficient of rigidity and the flexibility ratio, were in low-quality values. For that reason, the study provides information that the royal palm sheath was recommended as a composite reinforcing material.
Co-Authors . Febriyani A.A. Ketut Agung Cahyawan W Adi Satriawan Adik Bahanawan Adzkia, Ulfa Agustina Hayatunnufus Agustina Hayatunnufus Agustina Hayatunnufus Alamsyah, Eka M Anggun Thevianni Arinana Arinana Arya Budhijatmiko Lelono Arya Budhijatmiko Lelono Asep Denih Atmawi Darwis Atmawi DARWIS Azhar Anas Bahanawan, Adik Budi Indra Setiawan Christiawan, Nikolaus Adven Dalhar Susanto Danang S. Adi Dede Hermawan Dede Hermawan Deded Sarip Nawawi Dina SETYAWATI Dodik R Nurrochmat Dwi J Priyono Dwi Joko Priyono Dwi Premadha Lestari Effendi Tri Bahtiar Eka M Alamsyah Erizal Evalina Herawati Fengky Satria Yoresta Gina Bachtiar Gina Gina Bachtiar Gustian Rama Putra Gustian Rama Putra Hady Ikhsan Han Roliadi Han Roliandi Hartanto, Rachmat Pudjo Hasanuddin Hasanuddin Hayatunnufus, Agustina I Wayan Darmawan Ignasia Maria Sulastiningsih Indah Sulistyawati Indah Sulistyawati, Indah ISKANDAR Z. SIREGAR Isna Yuniar Wardhani Istie Rahayu Jajang Suryana Karlinasarie, Lina Khairun Hidayat Khairun Hidayat Khairunnisa Iskandar Putri Kholiyah Kholiyah Larasatie, Pipiet Lastiur Eva Panggabean Leonard D D Liliefna Leopold O. Nelwan Lestari, Dwi Premadha Lina Karlinasari Lusita WARDANI Massijaya, Muhammad Y Muh Yusram Massijaya Muh. Sakti Muhammadiah Muh. Yusram Massijaya Muhammad Y Massijaya Nurhaida, . Remy Marchal Rentry Augusti Rentry Augusti N Riezky Rakamuliawan Sutanto Rita Kartika Sari S. Adi, Danang Sucahyo Sadiyo Sulistyono Sulistyono . Sulistyono Sulistyono Surjono Surjokusumo Surjono Surjokusumo Surjono Surjokusumo Surjono Surjokusumo Surjono Suryokusumo Surjono Suryokusumo Surjono Suryokusumo, Surjono Suryokusumo, Surjono Sutanto, Riezky Rakamuliawan Teguh DARMAWAN Teguh Darmawan ULFA ADZKIA Wahyu DWIANTO Wahyu Dwianto widyarko, widyarko Wilis Wiryawan Yusuf S Hadi Yusuf S. Hadi Yusuf Sudo Hadi