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Sumatera utara
INDONESIA
FORESTA
Published by Universitas Sumatera Utara
ISSN : 20899390     EISSN : -     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Arjuna Subject : -
Articles 12 Documents
 1   2 
Pengaruh Rasio Semen/Serat Dan Jenis Katalis Terhadap Kekuatan Fiber-Cement Board Dari Limbah Kertas Kardus (The Influence of Cement-to-Fiber Ratio and Type of Catalyst on Strength Properties of Fiber-Cement Board Made from Old Corrugated Paper) Luthfi Hakim; Tito Sucipto
FORESTA Vol 1, No 2 (2012): Indonesian Journal Of Forestry Volume 1 No. 2 (Juli 2012)
Publisher : FORESTA

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Abstract

Fiber cement board (FCB) made from old corrugated paper has not to develop. The main objective of this study was to evaluate the suitability of old corrugated paper as reinforcement for cement-bonded board and the study was undertaken to: 1) determine the optimum cement-to-fiber ratio, the best type of catalyst; 2) determine the strength properties of cement-bonded boards manufactured from the old corrugated paper; 3) determine the effect of cement-to-fiber ratio on strength properties of cement-bonded boards from old corrugated paper. The treatments of cement/fiber ratio were 60:40 ; 50:50 and 40:60. The catalyst were aluminum sulfate (Al2(SO4)3), sodium silicate (Na2SiO3), and calcium chloride (CaCl2) as an accelerator. Old Corrugated paper was soaked into cold water for 48 hours and continued re-pulped with disintegrator at 2 % consistency for 15 minutes until the fiber separated. The boards were pressed by cold press at 25 kg/cm2 for 15 minutes with density target at 1 g/cm3. Methods of this research were two steps curing. The first step was air curing for 48 hours and continued of second step was oven curing at 80o C for 48 hours. The result of the research showed that the density of boards was average 1.03 g/cm3. The effect of cement-to-fiber ratio on the strength properties showed that 60:40 is better rather than 50:50 and 40:60. The best Catalyst is calcium chloride (CaCl2).Keywords: catalyst, fiber-cement board, old corrugated paper, strength properties.
Karakteristik Balok Laminasi Dari Batang Kelapa (Cocos Nucifera L.) Dan Kayu Kemiri (Aleurites Moluccana Wild.) (Characteristics of Glued Laminated Beams of Coconut Trunk (Cocos nucifera L.) and Candlenut Wood (Aleurites moluccana Wild.) Iwan Risnasari; Irawati Azhar; Astri Novita Sitompul
FORESTA Vol 1, No 2 (2012): Indonesian Journal Of Forestry Volume 1 No. 2 (Juli 2012)
Publisher : FORESTA

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Abstract

The Utilizing forest as source of wood raw materials is tend to increase, while the supply of wood is limited. As a result it can influenced the sustainable of ecosystem and the forest condition it self. The main objective of this was to find out the substitution of construction board (lumber and plywood). This research concerned to using coconut trunk and kemiri wood as alternative raw material in producing glued laminated beams. It is needed by industrial sector as a raw material because wood has been limited and it may solve environmental problem. In this research, the treatment is number of layer on glued laminated beam (3 layer, 5 layer, and 7 layer). Coconut trunks were used as outer layers and kemiri wood was used as midle layer and bonded by Isocyanate and PVAc by different ratio of 100:15. Evaluation on physical and mechanical properties were measured based on ASTM D 198-05. The results showed: 1). The value of density of gluelam were in the range 0,63–0,68 g/cm3 2). The value of moisture content were in the range 14,14-14,37 % 3). The value of water absorption for 2 and 24 hours were in the range 8,61- 8,74 % and 21,09-21,29 % 4). The value of thickness swelling for 2 and 24 hours were in the range 0,79-0,80 % and 1,57-,59 % 5). Modulus of elasticity (MOE) value were in the range 7519,63-18358,40 kgf/cm2 6). Modulus of rupture (MOR) value were in the range 180,34-364,04 kgf/cm2 7). Internal bond (IB)value were in the range 2,48-3,95 kgf. Layers of glued laminated beams are not significantly influence the value of physical and mechanical properties, except the value of MOR. The best result achieved in this research is the beam prepared from 3 layers.Keywords : Coconut trunk, kemiri wood, glued laminated beams, physical and mechanical properties.

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