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< 전시-P-53 > Physical and Mechanical Properties Of Hybrid Bamboo Oriented Strand Board
( Fauzi Febrianto ),( Sena Maulana ),( Muhammad Iqbal Maulana ),( Marwanto ),( Soleh Muhammad ),( Rika Kartika Sari ),( Wahyu Hidayat ),( Nam Hun Kim ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
Betung and andong bamboos have been known as good raw material of oriented strand board (OSB) due to its great physical and mechanical properties in the each single species OSB. In order to enhance the utillization of these bamboo, hybrid OSB made from combination of betung and andong bamboos were developed. In this study, the physical and mechanical properties of hybrid OSB at different face:core:back ratios were observed. Betung and andong strands were prepared manually using sharp knife and scissor. Three layered hybrid OSB with 0.7 g cm<sup>-3</sup> target density and 8% phenol formaldehyde resin content were manufactured. The face:core:back ratios of hybrid OSB were set to 15:70:15; 20:60:20; 25:50:25; and 30:40:30, with betung bamboo as face layer and andong bamboo as core. Addition of 1% paraffin based on oven dried strands was applied. Physical and mechanical properties of hybrid OSB was evaluated in accordance to the JIS A 5908:2003 standard. The results showed that hybrid OSB with 25:50:25 shelling ratio has optimum mechanical properties. Hybrid OSB made from betung bamboo as face and andong bamboo as core layer has lower gap between mechanical properties in the parallel and perpendicular to face orientation compared to each betung and andong single species OSB.
( Muhammad Iqbal Maulana ),( Rio Ardiansyah Murda ),( Byantara Darsan Purusatama ),( Rita Kartika Sari ),( Deded Sarip Nawawi ),( Siti Nikmatin ),( Wahyu Hidayat ),( Seung Hwan Lee ),( Fauzi Febrianto 한국목재공학회 2021 목재공학 Vol.49 No.1
The objective of this study was to investigate the effect of alkali-washing with different sodium hydroxide concentrations on the chemical compositions of steam-treated Betung bamboo strand. Strands were subjected to steam treatment at 126 ºC for 1 h under 0.14 MPa pressure and followed by washing with 1-5% sodium hydroxide solution for 30 sec. The alteration of structural and non-structural chemical components content of bamboo strands was evaluated. Steam and washing treatments with various concentrations of sodium hydroxide solution considerably reduced the extractive content of bamboo strands, and the cell wall chemical components of the strand in the small degree. FTIR analysis showed noticeable changes in peaks related to hemicellulose and lignin. The relative crystallinity increased significantly after steam and washing treatment with sodium hydroxide up to 3% concentration. SEM Images showed smooth and clean strands surface after washing with 3% sodium hydroxide.
Study of Non-Newtonian fluid flow in porous media at core scale using analytical approach
Ryan Kurniawan Santoso,Iqbal Fauzi,Miftah Hidayat,Boni Swadesi,Bilal Maydika Aslam,Taufan Marhaendrajana 한국자원공학회 2018 Geosystem engineering Vol.21 No.1
Characterizing in situ polymer rheology in porous media is critical before further implementation of polymer injection in oilfield. Polymer as non-Newtonian fluid has unique behavior whose viscosity changes over various shear rate. This behavior creates unsuitable conditions which can lead to ineffective sweep efficiency improvement. The challenging issue in characterizing the in situ polymer rheology is how to construct the in situ Power Law model since the in situ viscosity cannot be measured directly. In this study, we use an analytical model to construct the in situ Power Law model. The model combines material balance equation, modified Darcy equation for non-Newtonian fluid flow, and equation of state. The model is solved for early (transient) time and late (steady-state) time. Coreflooding results in Berea Sandstone with 2000 and 500 ppm HPAM polymer injection are used for model’s simulations. Rheometer measurements are also used for comparison. The overall simulation results show there is no difference in flow behavior index between rheometer and porous media. The same fluid definitely gives the same flow behavior index through different measurement methods. However, there is significant difference in flow consistency index. It is caused by the effect of porous media’s tortuosity. The quantity of the skin parameter also depicts the thinning and thickening phenomena.
( Sena Maulana ),( Muhammad Iqbal Maulana ),( Marwanto ),( Yuarsa Gumelar ),( Wahyu Hidayat ),( Nyoman Jaya Wistara ),( Ihak Sumardi ),( Fauzi Febrianto ),( Nam Hun Kim ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
The objective of this study was to evaluate the properties of bamboo oriented strand board (BOSB) from betung (Dendrocalamus asper ) bamboo using destructive and non-destructive methods under various shelling ratio and resin content. Strands were vacuum-treated at 126 ºC for 1 h under 0.14 MPa pressure and followed by washing with 1% NaOH solution. Three-layer BOSB (face:core:back) layers with the core layer perpendicular to the surface was formed with 15:70:15; 20:60:20; 25:50:25; 30:40:30 weight ratio and binded with 7 and 8% of phenol formaldehyde (PF) resin with the addition of 1% of wax. The evaluation of physical and mechanical properties of the boards was conducted in accordance with the JIS A 5908:2003 standard and compared with CSA 0437.0 standard for commercial OSB (Grade O-1). The results showed that BOSBs manufactured using 8% resin content with various core-to-face layer ratios had better physical and mechanical properties than using 7% resin content. Increasing core layer ratio increased the strength of BOSBs parallel to the grain. The face:core:back layers ratio of 25:50:25 could be used as a simple way to reduce PF resin requirements from 8% to 7%. Testing of non-destructive mechanical properties in betung BOSB has a high correlation with destructive testing.
( Lukmanul Hakim ZAIN ),( Fauzi FEBRIANTO ),( I Nyoman Jaya WISTARA ),( Marwanto N ),( Muhammad Iqbal MAULANA ),( Seung Hwan LEE ),( Nam Hun KIM ) 한국목재공학회 2019 목재공학 Vol.47 No.5
Cellulose nanocrystals (CNCs) were successfully isolated from oil palm fronds (OPFs) using different concentrations of ammonium persulfate (APS), and their characteristics were analyzed by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis, and thermogravimetric analysis (TGA). APS oxidation effectively isolated CNCs with rod-like morphology in nanometer scale. The dimensions of the CNCs decreased with increasing APS concentration. FTIR and XRD analyses revealed that all the CNCs showed crystals in the form of cellulose I without crystal transformation occurring during APS treatment. The relative crystallinity of the CNCs increased with increasing APS concentration, whereas their thermal stability decreased. An APS concentration of 2 M was found to be optimal for isolating the CNCs.
( Sena Maulana ),( Yuarsa Gumelar ),( Adesna Fatrawana ),( Muhammad Iqbal Maulana ),( Wahyu Hidayat ),( Ihak Sumardi ),( Nyoman Jaya Wistara ),( Seung Hwan Lee ),( Nam Hun Kim ),( Fauzi Febrianto ) 한국목재공학회 2019 목재공학 Vol.47 No.4
The objectives of this study were to evaluate the effects of shelling ratio and resin content on the properties of bamboo oriented strand board (BOSB) from betung (Dendrocalamus asper) and to determine the correlation between the results of dynamic and static bending tests. Strands were steam-treated at 126 ºC for 1 h under 0.14 MPa pressure and followed by washing with 1% NaOH solution. Three-layer BOSB with the core layer perpendicular to the surface was formed with shelling ratios (face:core ratio) of 30:70; 40:60; 50:50; 60:40 and binded with 7% and 8% of phenol formaldehyde (PF) resin with the addition of 1% of wax. The evaluation of physical and mechanical properties of BOSB was conducted in accordance with the JIS A 5908:2003 standard and the results were compared with CSA 0437.0 standard for commercial OSB (Grade O-1). Non-destructive testing was conducted using Metriguard Model 239A Stress Wave Timer which has a wave propagation time from 1 to 9,999 μs and a resolution of 1 μs. BOSB with 8% resin content showed better physical and mechanical properties than those with 7% resin content. The increase of the face layer ratio improved the strength of BOSB in parallel direction to the grain. The results suggested that shelling ratio of 50:50 could be used as a simple way to reduce PF resin requirements from 8% to 7% and to meet the requirements of CSA 0437.0 standard. The results of non-destructive and destructive tests showed a strong correlation, suggesting that non-destructive test can be used to estimate the bending properties of BOSB.