Bamboo Plywood Research Articles

A new strategy for bamboo ultra-long radial slice preparation and novel composite fabrication

Bamboo has high-mechanical-strength fibers arranged longitudinally in its growth direction. However, its hollow structure has nodes and uneven density walls, which complicate bamboo processing and utilization. In this study, a method for preparing bamboo ultra-long radial slices (BURSs) along the bamboo growth direction and using the corollary equipment was proposed. New BURSs with a curling shape were collected regularly and weighed to be approximately the same. Several groups of BURSs with the same quality were regularly arranged and pressed into BURS composites (BURSCs) with density of 0.5, 0.6, 0.7 or 0.8 g/cm3. The BURSs well retained fiber integrity. The BURSC with density of 0.7 g/cm3 showed a higher strength-to-density ratio (S: D) than wooden oriented strand board (OSB). Its modulus of rupture, modulus of elasticity, internal bond strength and thickness swelling were 47.5 MPa, 3723 MPa, 1.03 MPa and 3.61%, respectively. Furthermore, a novel BURS processing mode which was optimized into bamboo medial slices with thin edge and green strips with triangular cross-section was proposed. Drum-shaped cross-section with thinner edge improved flowability of bamboo slices during hot pressing and optimized the structure of the composites. This BURS was a novel high-quality component of bamboo boards with high surface quality, strip strength, efficient producing and easy assembling of bamboo strands. The BURSC was proved to be an upgrade product of bamboo OSB and bamboo plywood with high S: D, excellent surface quality and high utilization rate of bamboo.

Near-surface-mounted retrofitting of adobe walls using different materials: Evaluation of seismic performance

This study focuses on the seismic strengthening of adobe walls using different reinforcement materials and different reinforcement schemes through the near-surface-mounted (NSM) technique. Six adobe wall panels (1900 × 1200 × 200 mm) were quasi-statically tested and comprised one unreinforced wall and five specimens reinforced with reinforced mortar strip, bamboo plywood and wood, respectively. The strengthening procedure involved insertion of the reinforcing materials into the grooves cut symmetrically on both sides of the walls. The results were described in terms of energy dissipation, lateral resistance, ultimate displacement, stiffness degradation, ductility, and tolerate maximum peak ground accelerations. The tolerate maximum peak ground accelerations (PGA) of the specimens were analyzed using the N2 method. The test results indicated that the tensile strength, elastic modulus and scheme of reinforcement materials had a significant impact on the seismic performance and failure mode of specimens. The reinforced mortar strips significantly improved the seismic performance of adobe walls, particularly when using horizontal and vertical reinforcement schemes. The reinforcement of adobe walls with bamboo plywood and wood had achieved satisfactory results in terms of ductility, energy dissipation, and PGA. Finally, the masonry calculation formula was modified to establish the formula for estimating lateral resistance of adobe wall.

Analisis Daya Saing Produk Bambu Indonesia di Pasar Internasional

Indonesia is the third richest country in Asia on bamboo resources. In Indonesia, bamboo has been widely used to substitute wood on many applications and also exported in certains bamboo products, such as sticks (used primarily for plaiting), charcoals, flooring, plywood, mats and screens, plaits and plaiting articles, pulp, and paper articles. This research aimed to analyse comparative and competitive advantages of Indonesian bamboo products in international market, including the factors effect its export growth on the period 2013 to 2017. Analysis was conducted under techniques RCA (Revealed Comparative Advantage), TSI (Trade Specialization Index) and CMS (Constant Market Share). Overall, the results showed that bamboo sticks and bamboo charcoals had strong and mature competitive advantages. However, bamboo flooring, bamboo plywood, bamboo mats and screens, and bamboo plaits and plaiting articles had weak competitive advantages and were on growing phase. Bamboo pulp and paper articles had had strong competitive advantages, but it was lessening to the phase of re-importing. The results of CMS analysis showed that commodity composition factor had positively affected export growth, while standard growth and competitiveness factors gave negative effect to Indonesian bamboo export growth.

Best Bamboo Plywood Company

Best Bamboo Plywood Company

Acoustic Emission Characteristics of Different Bamboo and Wood Materials in Bending Failure Process

The acoustic emission (AE) technique can perform non-destructive monitoring of the internal damage development of bamboo and wood materials. In this experiment, the mechanical properties of different bamboo and wood (bamboo scrimber, bamboo plywood and SPF (Spruce-pine-fir) dimension lumber) during four-point loading tests were compared. The AE activities caused by loadings were investigated through the single parameter analysis and K-means cluster analysis. Results showed that the bending strength of bamboo scrimber was 3.6 times that of bamboo plywood and 2.7 times that of SPF dimension lumber, respectively. Due to the high strength and toughness of bamboo, the AE signals of the two bamboo products were more abundant than those of SPF dimension lumber. However, the AE evolution trend of the three materials was similar, which all experienced three stages, including gentle period, steady period and steep period, and the area of rupture precursor characteristics could be recognized before the specimen destroyed. Due to the bottom layer was first tensile failure, the main structure of bamboo plywood was destroyed after the stress redistribution. The rupture precursor characteristics could be observed before each peak. Findings put in evidence a good correlation between AE clusters of two bamboo products, while the amplitude and energy of wood signals were lower than those of bamboo. The amplitude and energy from the propagation and aggregation of cracks were greater than those related to micro-cracks initiation.

Experimental study on bending properties of cross-laminated timber-bamboo composites

Using bamboo and timber to manufacture cross-laminated timber-bamboo (CLTB) composites could utilize the advantages of two material to improve the mechanical properties and expand the raw material source of cross-laminated timber (CLT). To explore the feasibility of using engineered bamboo as CLT lamination, the rolling shear properties of two bamboo scrimbers and one bamboo plywood were evaluated. Two types of CLTB specimens, using bamboo scrimber as transverse layer or as both transverse layer and the outermost longitudinal layer, were developed in this study. The bending properties of CLTB and generic Spruce-pine-fir (SPF) CLT specimens were evaluated by dynamic tests and third-point bending tests, respectively. The shear analogy method was employed to calculate the apparent bending stiffness of CLT/CLTB specimen. The results indicated that the rolling shear modulus and strength of bamboo scrimber (group RB(F)-4.5) were 92.81% and 98.64% higher than those of bamboo plywood, respectively, and were 330.19% and 121.13% higher than those of SPF dimension lumber, respectively. The CLTB specimens, group BWBWB, had 23.69% and 60.50% higher apparent bending modulus and peak load than those of generic SPF CLT specimens. Most of the CLTB bending specimens had main failure mode of tensile failure in the bottom layer which replaced rolling shear failure in transverse bamboo scrimber layer. The apparent bending stiffness values of CLT/CLTB specimens obtained from dynamic test and shear analogy method were in good agreement with the static experimental values. The results presented in this paper can provide fundamental basis for supporting the potential engineering application of CLT panel products fabricated with bamboo scrimber.

AXIAL COMPRESSION TESTING OF BAMBOO PLYWOOD-ENCASED THIN-WALLED STEEL TUBE/STONE DUST CONCRETE COLUMNS

A novel structural member, the bamboo plywood-encased thin-walled steel tube/stone dust concrete composite column (BSDCC), was investigated in this study. Axial compression tests were conducted on 10 BSDCC specimens; their failure characteristics and modes were examined, and the effects of the stone-dust concrete content ratio and strength, specimen slenderness ratio, cross-sectional composition and binding bar confinement pattern, and binding bar spacing ratio on the bearing capacity and deformation of the columns were investigated. Two main compressive failure modes were observed: (1) adhesive failure by cracking and debonding between the bamboo plywood boards and between the bamboo plywood and the steel tube and (2) compressive-flexural failure of the bamboo plywood between the binding bars in the middle of the specimen. For specimens with the same cross-sectional dimensions, the cross-sectional content ratio of the stone dust concrete impacted the deformation and failure mode but did not significantly affect the ultimate bearing capacity. The bearing capacity decreased with increasing specimen slenderness and binding bar spacing ratio and increased with increasing stone dust concrete strength and bamboo plywood constraint (in terms of the cross-sectional composition and binding bar restraint pattern). A model for the ultimate bearing capacity of BSDCCs was established through regression analysis.

Compressive behaviour of stone dust concrete composite columns confined with bamboo plywood and thin-walled steel-tube systems

A novel bamboo plywood and thin-walled steel-tube dual-confined stone dust concrete composite column (BSDCC) is proposed to integrate the utilization of industrial solid waste and bamboo materials. Compression tests are performed on 12 BSDCC specimens. The failure mechanism is elucidated by analysing the entire process of specimen damage, the failure modes of the thin-walled steel tubes, the load-displacement curves, and the strain development patterns of different composite components. The test results show that the failure modes of the BSDCC specimens under compression were dominated by adhesive cracking failure of the bamboo plywood between the transverse binding bars in the middle of the column and the bamboo plywood on the tension side and yielding of the inner steel tube. Throughout the loading process, the specimens showed ideal elastoplastic behaviour, but the plastic capacity was not advantageous, and the plastic strengthening effect was not obvious. The bearing capacity of the stone dust concrete accounts for less than 10% of the total bearing capacity of the composite column, so the concrete strength is not the main factor improving the bearing capacity. The inner steel tube filled-with low-strength stone dust concrete can result in a composite column configuration with better mechanical properties, changes the failure mode of the composite column and the deformation mode of a cross-section, and delays the overall failure of the composite column. The setting of binding bars can effectively delay the bamboo plywood failure, and the outward partial buckling of the slab and steel tube enhances the restraint effect of the steel tube on the core concrete. Setting the binding bar in the middle of the column body can improve the column eccentric load bearing capacity and ductility. A formula for calculating the bearing capacity of BSDCCs under eccentric compression is established based on nonlinear regression analysis.

Study on the Effects of Technology Parameters on the Water Absorption and the Thickness Swelling of the Pressed Bamboo Pulp Plywood

The application of bamboo by-products such as bamboo branches, chips to recycle and produce pressed bamboo pulp is an urgent task in Vietnam. It perfectly replaces natural wood with artificial wood embryos from bamboo powder, which has both economic benefits of reserving the source of raw materials, environmental protection... The paper presents a study of the influence of technological parameters on the water absorption and swelling thickness of pressed bamboo pulp plywood in order to ameliorate the quality of pressed bamboo pulp plywood in production of new materials for civil engineering with environmentally friendly bamboo wood pulp materials.

Study on the Effects of Technology Parameters on the Bending Strength of Press Bamboo Powder Plywood

The application of bamboo by-products such as bamboo branches, debris... to recycle and produce bamboo powder plywood, perfectly saves high price natural resource of national wood with artificial wooden boards made from bamboo powder that ensures the reservation of natural source of raw materials and protecting of environment. Plywood that is made from bamboo powder has both economic and environmental benefits. It is an urgent task for providing a new version of material for civil engineering in Vietnam. The paper presents a study of the effect of technological parameters on the bending strength of pressed bamboo pulp plywood in order to enhance the mechanical properties of a new domestic product of construction in Vietnam.

Experimental Research on Basical Mechanical Properties of Bamboo Plywood

The objective of this study is to investigate the mechanical properties of bamboo plywood. Seeking more sustainable materials to reducing the carbon impact onto our environment has put bamboo on the map as an alternative building material, especially in the regions such as China, Southern Asia, and South America, where the bamboo is abundant. The basical mechanical properties of the bamboo plywood were carefully tested and recorded to provide a first-hand database on the parameters of the compressive strengths and shear strengths of such material.It can provide theoretical reference for the application of bamboo plywood in practical engineering.

Influence of slab structure on the performance of bamboo based concrete formwork

To reduce the density of bamboo-based concrete formwork on the premise of meeting the performance requirements, the bamboo was first treated by cold plasma, and then by increasing the distance between the adjacent bamboo strips of the radial bamboo curtain in the middle layer, the internal porosity was increased. The production of lightened bamboo based concrete formwork, which meets China’s forestry industry standards, was achieved. Four groups of bamboo-based concrete formworks with different slab structures were designed. The key results showed that slab structures have an extremely significant effect on the density, MOR, MOE, IB, and TS of the bamboo-based concrete formwork. A group of optimal slab structures was obtained by comparing their physical and mechanical properties (1st and 9th floor-phenolic resin impregnated paper, 2nd and 8th floor-bamboo mat, 3rd and 7th floor-tangential bamboo curtain, 4th and 6th floor-radial spaced bamboo curtain). Based on the required physical and mechanical properties, its density was 0.62 g·cm-3, which was 27.1% lower than that of traditional bamboo plywood template (0.85 g·cm-3) circulating on the current market. This lightened BBCF can save raw materials, facilitate transportation and reduce labor intensity in the application process so that it will be widely used in building construction.

A research on the design a bamboo powder drying machine

Bamboo is a sustainable and environmentally friendly material that has the potential to improve the global decline of natural resources. Bamboo is very popular in the countryside of almost all Southeast countries, particularly in Vietnam. Its ability can replace some kinds of wood in decoration and household goods. Bamboo grows up rapidly and can be harvested within 3 to 5 years of planting, in the meanwhile, the harvesting time of other hardwood trees must be from 8 to 10 years or longer. The inherent characteristics of bamboo are lighter than other wood materials and have a value in social and environmental benefits. Its advances in manufacturing technology have created high-value products such as bamboo flooring and bamboo furniture that can substitute for wood flooring and wood furniture. According to the biology studies, the bamboo has the characteristics that can replace the natural wood, but the direction of development from the stage of cultivation to the stage of finished products has not been exploited thoroughly. The production of bamboo plywood will become a great potential for the bamboo plywood industry in Vietnam. Generally, the fabrication of bamboo plywood depends on the following processes such as cutting, grinding to powder or pulp, drying, and pressing processes. In cutting and grinding processes, the trivial remains of bamboo after use, shoots… can be chopped and ground to a powder that is dried and pressed into bamboo plywood by a specialized machine similar to the production of artificial wood particleboard (PB). Bamboo powder drying machine plays a very important role in the production process of bamboo plywood. The function of the machine is drying bamboo powder to get the technical required appropriate moisture before pressing it into the standard bamboo boards. This article presents a design of bamboo powder drying machine with simple structure, long life, medium productivity, and price suitable for medium and small scale production of the Vietnam market. The first bamboo powder drying machine that was manufactured in DCSElab and its products is considered to respond to the technical requirements of customers.

A study on the design of bamboo grinding machine

Bamboo is a sustainable and environmentally friendly material that has the potential to improve the global decline of natural resources. Bamboo is one of the popular flora in Southeast Asia; it is also traditional plants that grow abundantly in Vietnamese villages from north to south. Its ability can replace some kinds of wood in decoration and household goods. Bamboo grows up rapidly and can be harvested within 3 to 5 years of planting, in the meanwhile, the harvesting time of other hardwood trees must be from 8 to 10 years or longer. The inherent characteristics of bamboo are lighter than other wood materials and have a value in social and environmental benefits. Its advances in manufacturing technology have created high-value products such as bamboo flooring and bamboo furniture that can substitute for wood flooring and wood furniture. According to the biology studies, the bamboo has the characteristics that can replace the natural wood, but the direction of development from the stage of cultivation to the stage of finished products has not been exploited thoroughly. The production of bamboo plywood will become a great potential for the bamboo plywood industry in Vietnam. Generally, the fabrication of bamboo plywood depends on the following processes such as cutting, grinding to powder or pulp, drying, and pressing processes. In cutting and grinding processes, the trivial remains of bamboo after use, shoots… can be chopped and ground to a powder that is dried and pressed into bamboo plywood by a specialized machine similar to the production of artificial wood particleboard (PB). The aim of this paper is a representation of a design, computing the structure of a version of a bamboo grinding machine that is sustainable, responds to technical requirements, and protection of the environment. The result of the design was applied for manufacture a typical bamboo machine in the CAD-CAM workshop of DCSELAB in the framework of a project between DCSELAB and PhuAn Village Corporation that has evaluated with satisfaction the real proof of the design. The machine has been in the session of initial testing and exploitation.

A Design of Bamboo Plywood Pressing Machine

Bamboo is very popular in the countryside of almost all Southeast countries, particularly in Vietnam. Its ability can replace some kinds of wood in decoration and household goods. Bamboo grows up rapidly and can be harvested within 3 to 5 years of planting; in the meanwhile, the harvesting time of other hardwood trees must be from 8 to 10 years or longer. The inherent characteristics of bamboo are lighter than other wood materials and have a value in social and environmental benefits. Its advances in manufacturing technology have created high-value products such as bamboo flooring and bamboo furniture that can substitute for wood flooring and wood furniture. Bamboo plywood presses play an important role in the production of bamboo plywood in the industry. The machine has the function of pressing bamboo powder, and binder has been mixed from the front to the bamboo plank to meet the technical requirements. This article presents a design of bamboo plywood pressing machine that combines the heating function for the blocking board and keeps that temperature during the pressing process to create a suitable size bamboo plywood according to customer requirements. The simulation results show that the complete bamboo plywood-pressing machine is appropriate and authentic to the initial design. The result of the design was applied to manufacture the machine in DCSELAB workshop via a collaboration project between Langtre PhuAn company and the DCSELAB. The system is installed a resistance flat plate capacity of 1KW, and 2 resistors flat plate with the capacity of 0.8KW. The first manufactured machine is now in the initial working session in Langtre Villige, Binh Duong province. The initial experimental products were accepted by the partner company, and we have recommended some measures to ameliorate time by time the quality as well as the productivity of the machine. There is really not yet an official statistic on the comparison with the products of a similar machine, and we are attending the response of the customers.

Axial Compression Testing of Bamboo-Laminated Encased Steel Tube Composite Columns

To resolve the problem of premature glue failure in square, thin-walled steel tube/bamboo-laminated composite hollow columns (SBCCs) under compression, a new type of SBCC with transverse binding bars (SBCCB) is proposed. An axial compression test was performed on nine SBCCBs to observe the compressive failure mode and analyse the influence of the net cross-sectional dimension, slenderness ratio and cross-sectional composition on the glue failure and the ultimate bearing load; the results were compared with the known limit stress of SBCCs without transverse binding bars. The experimental results indicate that the compressive damage to SBCCBs is primarily the breaking of the bamboo plywood material and glue failure between the matrix interfaces at the end and middle of the column between the binding bars. The ultimate bearing load is not only related to the dimensions of the cross section and the slenderness ratio but also impacted by the cross-sectional composition. Installing transverse binding bars can effectively reduce glue failure in the test specimens, alter the limit failure mode and significantly increase the ultimate bearing load. Compared to the limiting compressive stress on an SBCC, the limiting compressive stress on an SBCCB is 26% higher on average. A formula for calculating the axial compressive load capacity of an SBCCB was established using nonlinear regression analysis.

Flexural Properties of Steel‐Bamboo Composite Slabs in Different Connection Methods

This paper presents a study aimed to estimate the flexural performance of profiled steel sheet‐bamboo plywood composite slabs as a first step to evaluate its potential application as structural components. Nine specimens were tested to investigate the stability of steel‐bamboo composite structure. According to different connection methods, three types of composite slabs were discussed, including pure bonding slabs (PBSs), composite bonding slabs (CBSs), and reinforced composite bonding slabs (RCBS). The result showed that specimens employed multiple composite methods (RCBS) exhibited excellent flexural bearing capacity and stiffness compared with PBS. The increase of bamboo plywood thickness could improve bearing capacity and flexural stiffness of composite slabs, while the reduction of screw spacing could enhance the bearing capacity and ductility of composite slabs. The RCBS, which can provide higher bearing capacity and stiffness and possess excellent deformation capability, are well worth of research and practical application.

A Study on the Effects of Technical Parameters on the Tensile Strength of Bamboo Plywood

The application of bamboo by-products such as bamboo branches, chips to recycle and produce pressed bamboo pulp is an urgent task in Vietnam. It perfectly replaces natural wood with artificial wood embryos from bamboo powder, which has both economic benefits of reserving the source of raw materials, environmental protection The paper presents a study on the influence of technological parameters on the tensile strength of pressed bamboo plastic fiber that is a new product of a project of our laboratory.

Study on Flexural Behaviour of Box Section Bamboo‐Steel Composite Beams

To take full advantages of the bamboo and cold‐formed thin‐walled steel, a new type of box section beam combined with bamboo and steel channel was proposed in this paper. Five composite beams with different parameters were tested to evaluate the effects of bamboo plywood thickness of composite beams and thickness and sectional dimension of steel channel. The results of experiment showed that the proposed composite beams exhibited excellent flexural bearing capacities and stiffness. The increase of bamboo plywood thickness and sectional dimension of steel channel could improve bearing capacity and flexural stiffness of composite beams, while the increase of steel thickness could enhance the bearing capacity and safety margin of composite beams. Furthermore, a new method to predict the deformation and bearing capacities of composite beams was proposed and matched well with the experimental results.

Analysis of bonding mechanism of glass fiber-reinforced bamboo plywood

Bamboo curtains, coarse glass fiber cloth, bamboo mat, poplar veneer, and fine glass fiber cloth impregnated with phenolic resin adhesive were sequentially laid from the inside to the outside, and the symmetrically balanced material was sent to the hot press. The bonding mechanism of the resulting glass fiber-reinforced bamboo plywood (GFRBP) was analyzed using environmental scanning electron microscopy (ESEM) and Fourier transform infrared (FTIR) spectroscopy. The bonding between the phenolic resin and fiberglass cloth was achieved with a coupling agent, which reacted chemically with both the fiberglass cloth and phenolic resin. ESEM showed that glass fiber was bonded strongly with phenolic resin after treatment with coupling agents such as KH-550, KH-560, and KH-792. When the GFRBP was damaged, there was no breakage at the bonding surface between the glass fiber and phenolic resin. During the hot-pressing process, the phenolic resin easily migrated to the middle of the gap between plywood plates, which promoted better integration and properties. FTIR results showed that the longitudinal sides of the GFRBP pressed by the fiberglass cloth that had been treated by the coupling agents KH-550 and KH-792 were similar to each other, but those treated with KH-792 contained more -CH2- and had a longer carbon backbone.