scholarly journals Influence of Board Density on the Physical and Mechanical Properties of Bamboo Oriented Strand Lumber

Forests ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 567 ◽  
Author(s):  
Yuhui Sun ◽  
Yahui Zhang ◽  
Yuxiang Huang ◽  
Xiaoxin Wei ◽  
Wenji Yu
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Physical And Mechanical Properties ◽  
Basic Research ◽  
High Strength ◽  
Density Variation ◽  
Raw Material ◽  
Modulus Of Rupture ◽  
Board Density ◽  
Property Control

The process of bamboo-oriented strand lumber (BOSL) represents one of the best opportunities for automation, property control and consistency, and high utilization of material from abundant, fast-growing, and sustainable bamboo. In this study, BOSLs were prepared, with reference to the preparation process of bamboo scrimber, by compressing and densifying constituent units under the action of moisture-heat-force and resin polymerization, and then the effects of density variation on their physical and mechanical properties were investigated. The results revealed that the modulus of rupture, modulus of elasticity, compressive strength and shear strength of BOSL with density of 0.78–1.3 g/cm3 ranged from 124.42 to 163.2 MPa, 15,455 to 21,849 MPa, 65.02 to 111.63 MPa, and 9.88 to 18.35 MPa, respectively. The preparation of BOSL with bamboo as raw material could retain the good mechanical properties of natural bamboo, and produce bamboo-based structural products with different properties by controlling the density. The high strength of BOSL with high density was primarily due to the increased volume fraction of elementary fibers, the reduced porosity, and the enhanced gluing interface. The performance of BOSL can be comparable to, or surpass that of, wood or bamboo products. This study provided necessary basic research for the engineering design and application of BOSL.

scholarly journals Suitability of Muli Bamboo (Melocanna baccifera) for Making Bamboo Mat Plywood

1970 ◽  
Vol 46 (4) ◽  
pp. 543-548 ◽  
Author(s):  
M Ashaduzzaman ◽  
R Rana ◽  
MNH Khan ◽  
MI Shams
Keyword(s):  
Mechanical Properties ◽  
Modulus Of Elasticity ◽  
Urea Formaldehyde ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Average Density ◽  
Raw Material ◽  
Modulus Of Rupture ◽  
Formaldehyde Resin ◽  
Alternative Source

This paper investigated the potentiality of muli (Melocanna baccifera) for making bamboo mat plywood. Bamboo mat plywood with the length, width and thickness of 2.4 m × 1.2 m × 7 mm was made using liquid urea formaldehyde resin. The physical and mechanical properties of such plywood were compared with the existing market plywood. The average density of bamboo mat plywood was much higher compared to the existing market plywood. The modulus of rupture (MOR) of bamboo mat plywood was 3 times and the modulus of elasticity (MOE) was 6 times higher compared to commercial (Bombax ceiba) plywood. Interestingly, the specific MOR and MOE were significantly higher than those of market plywood. The high strength values might be due to the long fiber length of the bamboo. Furthermore, the lamination of decorative thin garjan (Dipterocarpus turbinatus) veneer did not significantly reduce mechanical properties of the products. Bamboo plywood mat as well as garjan laminated bamboo mat plywood showed better performance in respect to thickness swelling, linear expansion and water absorption. Hence, muli bamboo can be a potential alternative source of raw material for the manufacture of plywood materials. Key words: Bamboo mat plywood; Density; Dimensional stability; Modulus of elasticity; Modulus of rupture DOI: http://dx.doi.org/10.3329/bjsir.v46i4.9605 BJSIR 2011; 46(4): 543-548

High-Effective Lightweight Aggregate Obtained from Glass-Containing Waste

2020 ◽  
Vol 787 (12) ◽  
pp. 66-71
Author(s):  
H.N. Mammadov ◽  
◽  
I.H. Suleymanova ◽  
B.M. Tahirov ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Strength Class ◽  
Physical And Mechanical Properties ◽  
Lightweight Aggregate ◽  
High Strength ◽  
Raw Material ◽  
Material Base ◽  
Current Standard ◽  
Iron And Steel

The properties of high-strength artificial porous aggregate from glass-containing waste of metallurgical productions are described. The developed technology makes it possible to expand the raw material base for the production of aggregates for light concrete. Granulated slags of metallurgical productions – the main (M0>1) slags of the Novokuznetsk Iron and Steel Plant and acid (M0<1) slags of the Gorky plant are studied. According to the results of studies, it was found that the optimal swelling interval for acidic slags is 1000–1100оC, and for basic slags-1100–1150оC. A high – strength artificial porous aggregate-slag gravel with a bulk density of 340–780 kg/m3 and a compressive strength in the cylinder of 2.8–12.3 MPa was obtained. The main physical and mechanical properties of the resulting aggregate, which meets the requirements of the current standard GOST 9757–90 “Gravel, crushed stone and sand. Artificial porous”, were studied. The aggregate obtained is almost twice as strong as the known aggregate of expanded clay gravel. With the use of porous gravel and sand, light concrete of strength class B7,5–B40 and a density of 1100–1600 kg/m3 was obtained.

Selected Physical and Mechanical Properties of Bamboo and Poplar Composite OSB with Different Hybrid Ratios

2012 ◽  
Vol 517 ◽  
pp. 87-95 ◽  
Author(s):  
Cheng Yong ◽  
Ming Jie Guan ◽  
Qi Sheng Zhang
Keyword(s):  
Mechanical Properties ◽  
Oriented Strand Board ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Raw Material ◽  
Mixed Structure ◽  
The World ◽  
Utilization Ratio ◽  
Application Fields ◽  
Good Substitute

Bamboo has been known as a good substitute of engineered wood raw material in the world for its naturally oriented high strength. In this paper, we made the bamboo and poplar composite OSB (oriented strand board) with different hybrid ratios in order to understand the technical feasibility of this composite OSB and to expand the engineered utilization of bamboo. The physical and mechanical properties are tested and the effect of different hybrid ratios on physical and mechanical properties of the board was analyzed. Using this bamboo and wood mixed structure, not only are we to improve the properties of the board, but also to expand the application fields, moreover to enhance the utilization ratio of resources.

scholarly journals Properties of Malaysian Solid Coco-Lumber

CORD ◽  
2009 ◽  
Vol 25 (2) ◽  
pp. 8
Author(s):  
Khairul, M.
Keyword(s):  
Mechanical Properties ◽  
Outer Part ◽  
Basic Density ◽  
Physical And Mechanical Properties ◽  
The Philippines ◽  
Raw Material ◽  
Modulus Of Rupture ◽  
Furniture Industry ◽  
Absorption Properties ◽  
Dry Conditions

Solid coco-lumber is relatively a new raw material in Malaysia’s furniture industry. However, different situations can be seen in the Philippines and Indonesia as they are actively producing and marketing coconut wood-based products. In this study, the physical and mechanical properties such as moisture content, basic density, Modulus of Rupture (MOR), Modulus of Elasticity (MOE), shear stress, compression parallel to the grain, thickness swelling and water absorption properties of Malaysian solid coco-lumber were determined. The solid coco-lumber was divided into inner and outer parts and were tested under two different conditions i.e. green and air-dry conditions. The study showed that the physical and mechanical properties of the air-dried outer part of the solid coco-lumber were 50% higher compared to the inner part under both conditions. The results proved that the properties of coconut wood tested are very useful to the emerging coco-lumber based furniture industry in Malaysia.

scholarly journals Some Properties of Eastern Red Cedar (Juniperus Virginiana L.) Particleboard Panels Made Using Modified Starch as Binder

2020 ◽  
Vol 71 (4) ◽  
pp. 371-377
Author(s):  
Onur Ulker ◽  
Salim Hiziroglu
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Modulus Of Rupture ◽  
Juniperus Virginiana ◽  
Modified Starch ◽  
Thickness Swelling ◽  
Eastern Red Cedar ◽  
Red Cedar

The objective of this study was to evaluate physical and mechanical properties of experimental panels manufactured from eastern red cedar (Juniperus virginiana L.) using modified starch as binder. Modulus of elasticity (MOE), modulus of rupture (MOR), internal bond strength (IB), hardness and dimensional stability in the form of thickness swelling and water absorption in addition to surface quality of the samples were tested. Panels were manufactured at three density levels, which are 0.60 g/cm3, 0.70 g/cm3 and 0.80 g/cm3. The highest MOE, MOR and IB values for the samples having 0.80 g/cm3 density were determined as 2207.16 MPa, 15.17 MPa and 0.87 MPa, respectively. Thickness swelling values of the samples soaked in water for 2 h ranged from 15.38 % to 23.23 %. Micrographs taken on the samples using scanning electron microscope revealed that starch was uniformly distributed within the particles. Based on the findings in this study, it appears that eastern red cedar would have a potential as a raw material to manufacture particleboard panel using modifi ed starch as green adhesive with accepted physical and mechanical properties.

scholarly journals Sifat Fisis dan Mekanis Oriented Strand Board Hibrida Bambu Pada Berbagai Shelling Ratio (Physical and Mechanical Properties of Hybrid Bamboo Oriented Strand Board at Various Shelling Ratios)

2021 ◽  
Vol 17 (2) ◽  
pp. 152-159
Author(s):  
Rynaldo Davinsy ◽  
Sena Maulana ◽  
Muhammad I Maulana ◽  
Elvara D Satria ◽  
Deded S Nawawi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Outer Layer ◽  
Oriented Strand Board ◽  
Phenol Formaldehyde ◽  
Physical And Mechanical Properties ◽  
Outer Core ◽  
Phenol Formaldehyde Resin ◽  
Modulus Of Rupture ◽  
Formaldehyde Resin ◽  
Board Density

Hybrid Bamboo Oriented Strand Boards (OSB) were produced to improve bamboo OSB's physical and mechanical properties. Shelling ratio adjustment of the strand type combination could determine the optimal physical and mechanical properties of hybrid bamboo oriented strand boards (OSB). The purpose of this study was to evaluate the physical and mechanical properties of hybrid betung and andong bamboos OSB at various shelling ratios. Steam modified strands of betung and andong bamboo were used as an outer layer and core layer, respectively. Hybrid bamboo OSBs were prepared with 0.7 g cm-3 target density and 8% phenol-formaldehyde resin content. Three layers of OSB were made with outer: core shelling ratios of 30:70, 40:60, 50:50, and 60:40. The physical and mechanical properties of the OSB were tested referring to the JIS A 5908-2003 standard. The targeted board density was achieved and the physical properties of all hybrid bamboo OSB have met the requirement of CSA O437.0 (Grade O-1) standard criteria. The parallel modulus of elasticity (MOE) and modulus of rupture (MOR) increased with increasing outer layer ratio. However, the perpendicular MOE and MOR decreased with increasing outer layer ratio. The internal bonding (IB) of the OSB with a shelling ratio of 30:70 and 40:60 met with the requirement of the CSA O437.0 (Grade O-1) standard.

scholarly journals Cross-Linked Chitosan as an Eco-Friendly Binder for High-Performance Wood-Based Fiberboard

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Erzhuo Huang ◽  
Yanwei Cao ◽  
Xinpeng Duan ◽  
Yutao Yan ◽  
Zhe Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dimensional Stability ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Modulus Of Rupture ◽  
Wood Fibers ◽  
Promising Candidate ◽  
Pressing Method ◽  
Optimum Modulus

High-performance wood-based fiberboards with high strength and dimensional stability were fabricated by hot-pressing method using 2,5-dimethoxy-2,5-dihydrofuran (DHF) cross-linked chitosan (CS) as an eco-friendly binder. The effects of cross-linked chitosan on the mechanical properties and dimensional stability of wood-based fiberboards were investigated. It is evident that cross-linked chitosan addition was effective in improving mechanical properties and dimensional stability of wood-based fiberboards. The prepared wood-based fiberboard bonded by DHF cross-linked CS displayed optimum modulus of rupture (MOR) of 42.1 MPa, modulus of elasticity (MOE) of 3986.0 MPa, internal bonding (IB) strength of 1.4 MPa, and thickness swelling (TS) value of 16.3%. The improvement of physical and mechanical properties of wood-based fiberboards could be attributed to the amide linkages and hydrogen bonds between wood fibers and cross-linked chitosan. The high-performance wood-based fiberboards fabricated in this study may be a promising candidate for eco-friendly wood-based composites.

Evaluation of Physical and Mechanical Properties of Paulownia Wood Core and Fiberglass Surfaces Sandwich Panel

2011 ◽  
Vol 471-472 ◽  
pp. 85-90 ◽  
Author(s):  
Maryam Sobhani ◽  
Abolghasem Khazaeian ◽  
Taghi Tabarsa ◽  
Alireza Shakeri
Keyword(s):  
Mechanical Properties ◽  
Sandwich Panel ◽  
Bending Strength ◽  
Polyester Resin ◽  
Weight Ratio ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Modulus Of Rupture ◽  
The Core ◽  
Paulownia Wood

The purpose of this study was to determine some physical and mechanical properties of sandwich panels manufactured from the core of Paulownia wood and surfaces of multilayer of fiberglass and resins. Paulownia was selected among Hardwoods because of its s low density (0.26 g/cm3) and high strength/weight ratio. Eight treatments were used for experiments: Two kinds of fiberglass (needle and combination of the needle and curtain type), two various resins (polyester and epoxy) and two core thicknesses (9mm and 19mm). Physical properties including density, resistance to water absorption, Dimensional stability, and Mechanical Properties such as internal bonding, compressive and bending strength of panels were measured following ASTM Standard. The results indicated that panels with 19 mm thick core had lower density (0.5g/ cm3) compared to the 9mm thick panels (0.7g/cm3). Bigger volume of wood in the core of panels with higher thickness was the main reason of this result. The experimental results showed that thickness of wood was effective on the modulus of rupture, modulus of elasticity, and compressive strength, significantly. Epoxy resin presented higher internal bond compared to the polyester resin. The two kind of fiberglass (needle one and the combination of needle and curtain type) didn’t have noticeable differences on mechanical properties. It also was found that Paulownia is a promising species for manufacturing sandwich panel.

Impact of Chemical Modification on the Physical and Mechanical Properties of Tropical Wood Material

2012 ◽  
Vol 576 ◽  
pp. 314-317
Author(s):  
Sinin Hamdan ◽  
M. Saiful Islam
Keyword(s):  
Mechanical Properties ◽  
Diazonium Salt ◽  
Treated Wood ◽  
Coupling Reaction ◽  
Physical And Mechanical Properties ◽  
Modulus Of Rupture ◽  
Ft Ir ◽  
Ir Analysis ◽  
D Values ◽  
Benzene Diazonium

Five types of selected tropical light hardwoods were chemically modified with benzene diazonium salt to improve their physical and mechanical properties. Benzene diazonium salt underwent a coupling reaction with wood which was confirmed through FT-IR analysis. The compressive modulus of the treated wood increased, whereas modulus of rupture was shown to decrease on treatment. The modified wood samples had higher hardness (Shore D) values compared to that of the control ones.

scholarly journals Composites from Thermoplastic Natural Rubber Reinforced Rubberwood Sawdust: Effects of Sawdust Size and Content on Thermal, Physical, and Mechanical Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Chatree Homkhiew ◽  
Surasit Rawangwong ◽  
Worapong Boonchouytan ◽  
Wiriya Thongruang ◽  
Thanate Ratanawilai
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Natural Rubber ◽  
High Density Polyethylene ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
Modulus Of Rupture ◽  
Shore Hardness ◽  
Thermoplastic Natural Rubber ◽  
Plastic Content

The aim of this work is to investigate the effects of rubberwood sawdust (RWS) size and content as well as the ratio of natural rubber (NR)/high-density polyethylene (HDPE) blend on properties of RWS reinforced thermoplastic natural rubber (TPNR) composites. The addition of RWS about 30–50 wt% improved the modulus of the rupture and tensile strength of TPNR composites blending with NR/HDPE ratios of 60/40 and 50/50. TPNR composites reinforced with RWS 80 mesh yielded better tensile strength and modulus of rupture than the composites with RWS 40 mesh. The TPNR/RWS composites with larger HDPE content gave higher tensile, flexural, and Shore hardness properties and thermal stability as well as lower water absorption. The TPNR/RWS composites with larger plastic content were therefore suggested for applications requiring high performance of thermal, physical, and mechanical properties.

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