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All Journal Jurnal Ilmu dan Teknologi Hasil Hutan Peronema Forestry Science Journal Jurnal Teknik Sipil Makara Journal of Technology
Evalina Herawati
Departemen Teknologi Hasil Hutan, Fakultas Kehutanan, Universitas Sumatera Utara Jl. Tri Darma Ujung No. 1 Kampus USU Medan
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Karakteristik Kekuatan Leleh Lentur Baut Besi dengan Beberapa Variasi Diameter Baut Herawati, Evalina; Sadiyo, Sucahyo; Nugroho, Naresworo; Karlinasari, Lina; Yoresta, Fengky Satria
Jurnal Teknik Sipil Vol 24, No 3 (2017)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1236.88 KB) | DOI: 10.5614/jts.2017.24.3.4

Abstract

AbstrakBaut merupakan salah satu jenis alat sambung mekanis atau pengencang yang banyak digunakan dalam sambungan kayu. Penelitian ini bertujuan untuk menentukan kekuatan leleh lentur (Fyb) dari tiga ukuran diameter baut besi yang umum digunakan untuk sambungan kayu dan satu ukuran diameter baut baja sebagai pembanding. Spesifikasi baut yang digunakan dilihat dari dimensi dan komposisi penyusunnya. Nilai Fyb baut diperoleh dari pengujian momen leleh lentur dengan mengacu pada standar ASTM F1575. Hasil pengujian menunjukkan baut besi yang digunakan berasal dari bahan baja karbon rendah sedangkan baut baja berasal dari bahan baja karbon sedang. Nilai Fyb baut baja lebih tinggi dibandingkan baut besi. Nilai Fyb baut besi diameter 1/2 inci berbeda nyata dengan nilai baut diameter 5/8 dan 3/4 inci. Nilai Fyb ketiga diamater baut berada di atas nilai Fyb baut yang tercantum dalam SNI 7973:2013 tentang Spesifikasi desain untuk konstruksi kayu.AbstractBolt is one of the mechanical fasteners that are widely used in wood connections. This study aims to determine the bending yield strength (Fyb) of three measures of bolt diameter made from iron which commonly used for the connection of wood and one measure of bolt diameter made from steel as a comparison. Specifications of bolts used can be seen from the dimensions and composition of the constituent. Testing of the bending yield strength was conducted according to ASTM F1575. The results showed that iron bolts used comes from low carbon steel, while steel bolts derived from medium carbon steel materials. Fyb value of steel bolts was higher than iron bolt. Fyb value of 1/2 inch diameter iron bolts was significantly different from the value of the bolts 5/8 and 3/4 inch in diameter. The Fyb value of three bolt diameter were above the Fyb value listed in SNI 7973:2013 concerning design specification for wood constructions.
Glued-laminated (glulam) beams is one of engineered wood products used for structural applications.  The objective of this research is to evaluate characteristics of glulam beams made from Acacia mangium Willd.    Laminations used were 2, 4, 6, 8 and 12 cm in widthnesses, 2 cm in thickness and 260 cm in length.  Each lamination was graded using Machine Stress Grading (namely by Panter or plank sorter) to determine the modulus of elasticity (MOE) value.  The glulam beams was 6 cm x 12 cm in five Evalina HERAWATI; Muh. YUSRAM MASSIJAYA; Naresworo NUGROHO
Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 1 No. 1 (2008): Jurnal Ilmu Teknologi Hasil Hutan
Publisher : Departemen Hasil Hutan, IPB

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Abstract

Glued-laminated (glulam) beams is one of engineered wood products used for structural applications.  The objective of this research is to evaluate characteristics of glulam beams made from Acacia mangium Willd.    Laminations used were 2, 4, 6, 8 and 12 cm in widthnesses, 2 cm in thickness and 260 cm in length.  Each lamination was graded using Machine Stress Grading (namely by Panter or plank sorter) to determine the modulus of elasticity (MOE) value.  The glulam beams was 6 cm x 12 cm in five types of cross-section which arranged by various widths and those MOE of laminations.  Glulam beams were bonded by water based polymer isocyanate (WBPI) using 280 g/m2 double glue spread.  The research results showed that glulam beams made from A. mangium Willd.  fulfilled the JAS 234:2003 standard as on following properties: moisture content, MOE, MOR, shear strength and immersion delamination test.  However, performance of glulam was unsatisfactory in wood failure ratio and boiling water soak delamination test.   Keywords:  Glulam beam, MOE, MOR, shear strength, delamination
Pengawetan Kayu Karet (Hevea braziliensis MUELL Arg) Menggunakan Asam Borat (H3BO3) Dengan Metode Pengawetan Rendaman Panas Dingin Preserving of Rubber Wood (Hevea braziliensis MUELL Arg) Using Boric Acid (H3BO3) With Cold and Hot Soaking Preservation Nadya Putri; Evalina Herawati; Ridwanti Batubara
Peronema Forestry Science Journal Vol 2, No 1 (2013): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

The objectives of this research were to calculate the amount of retention and penetration scores and to examine the stability of dimension and strength of rubber wood after conserving with boric acid preservative (H3BO3). The method applied in this research was hot and cold soaking . After a test sample was preserved with boric acid, then its retention, penetration, and ASE scores were calculated, and the examination of MOE and MOR was conducted eventually. In this research, the best concentrate was gained at treated concentrate 3 % for the retention score, penetration and ASE scores are 1.39 kg/m2, 0.89 mm, and 2.65 %. While the highest MOE and MOR score was gained at 0% concentrate (controlled) with 17619 kg/m2 and 210 kg/m2. The retention and penetration scores increased as the concentrate increased. But the distribution the preservative was able to decrease the strength of wood. Keywords : preservation, rubber wood, boric Acid, MOE, MOR
Karakteristik Fisis dan Mekanis Papan Semen Bambu Hitam (Gigantochloa Atroviolacea Widjaja) dengan Dua Ukuran Partikel Physical and Mechanical Characteristics of Cement Board Bamboo Hitam (Gigantochloa atroviolacea Widjaja) Using Two Particle Sizes. Rini Armaya; Evalina Herawati; Tito Sucipto
Peronema Forestry Science Journal Vol 2, No 1 (2013): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Cement boards was made ​​from bamboo hitam (Gigantochloa atroviolacea Wdjaja) using two particle sizes of 20 mesh and 40 mesh. The difference in particle size thought to affect the quality of the resulting cement board. The purpose of this study was to evaluate the physical and mechanical properties of cement board bamboo hitam using two  particle sizes.Boards were made ​​with size 25 cm x 25 cm x 1 cm with density of 1.2 gr/cm3 of two different particle size of 20 mesh and 40 mesh and each made ​​in three replications. Cement board was made with ratio of particles, cement and water in 1:3:2 and the addition of MgCl2 catalyst was 5%. In general, physical properties of  cement board had completed the standard JIS A 5417-1992, both cement board particle size 20 mesh and 40 mesh. Physical properties of  cement board using particle size of 40 mesh better than  cement board using particle size of 20 mesh. MOR value of  cement board using particle size of 20 mesh had met standard while the value of MOE did not complete the standard. Internal bond and screw holding strenght did not require in standard JIS A 5417-1992. Cement board using particle size of 20 mesh had better mechanical properties than cement board using particle size of 40 mesh. Keywords: bamboo hitam, particle size, cement board, physical properties, mechanical properties
Medium Density Fibreboard Made of Acetylated Sludge from Paper Mill Hakim, Luthfi; Herawati, Evalina; Wistara, I Nyoman Jaya
Makara Journal of Technology Vol. 15, No. 2
Publisher : UI Scholars Hub

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Abstract

Medium Density Fibreboard Made of Acetylated Sludge from Paper Mill. Research of using sludge as raw material for making medium density fibreboard (MDF) was useful to create additional value of sludge. The objective of the research was to evaluate physical properties, mechanical properties, and durability of MDF from acetylated sludge in 4 levels of acetate anhydride (0%, 3%, 5%, and 7%) with 3 replicates. The MDF was made using dry process. After materials were mixed with adhesives, they were pressed using hotpress under 170 oC temperature and 45 Pa pressure for 25 minutes. The size of the MDF sample was 25 cm x 20 cm x 1 cm with 0.8 g/cm3 density. The physical properties (density, moisture content, water absorption, thickness swelling) and mechanical properties (modulus of elasticity, modulus of rupture, internal bond, screw holding power) was tested based on JIS A 5905-2003 standard. The durability was evaluated using SNI 01-7207-2006. All physical properties of MDF fulfill JIS A 5905-2003. Acetate anhydride decreased the moisture content value of MDF. On the other hand, all mechanical properties did not fulfill the standard. That was caused by calcium carbonate in sludge that blocked the adhesion between sludge fibres. The durability of MDF tested here was classified Class I which is very resistant to termites.
Co-Authors Fengky Satria Yoresta I Nyoman Jaya Wistara Lina Karlinasari Luthfi Hakim Luthfi Hakim Muh. Yusram Massijaya Nadya Putri Naresworo Nugroho Ridwanti Batubara Rini Armaya Sadiyo, Sucahyo Tito Sucipto