scholarly journals Flexural Creep Behavior of High-Density Polyethylene Lumber and Wood Plastic Composite Lumber Made from Thermally Modified Wood

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 262 ◽  
Author(s):  
Murtada Abass A. Alrubaie ◽  
Roberto A. Lopez-Anido ◽  
Douglas J. Gardner
Keyword(s):  
Creep Behavior ◽  
Creep Deformation ◽  
High Density Polyethylene ◽  
Creep Compliance ◽  
High Density ◽  
Wood Plastic Composite ◽  
Creep Stress ◽  
Plastic Composite ◽  
Thermally Modified Wood ◽  
Modified Wood

The use of wood plastic composite lumber as a structural member material in marine applications is challenging due to the tendency of wood plastic composites (WPCs) to creep and absorb water. A novel patent-pending WPC formulation that combines a thermally modified wood flour (as a cellulosic material) and a high strength styrenic copolymer (high impact polystyrene and styrene maleic anhydride) have been developed with advantageous viscoelastic properties (low initial creep compliance and creep rate) compared with the conventional WPCs. In this study, the creep behavior of the WPC and high-density polyethylene (HDPE) lumber in flexure was characterized and compared. Three sample groupings of WPC and HDPE lumber were subjected to three levels of creep stress; 7.5, 15, and 30% of the ultimate flexural strength (Fb) for a duration of 180 days. Because of the relatively low initial creep compliance of the WPC specimens (five times less) compared with the initial creep compliance of HDPE specimens, the creep deformation of HDPE specimens was six times higher than the creep deformation of WPC specimens at the 30% creep stress level. A Power Law model predicted that the strain (3%) to failure in the HDPE lumber would occur in 1.5 years at 30% Fb flexural stress while the predicted strain (1%) failure for the WPC lumber would occur in 150 years. The findings of this study suggest using the WPC lumber in structural application to replace the HDPE lumber in flexure attributable to the low time-dependent deformation when the applied stress value is withing the linear region of the stress-strain relationship.

Modeling the hygrothermal creep behavior of wood plastic composite (WPC) lumber made from thermally modified wood

2019 ◽  
Vol 33 (8) ◽  
pp. 1109-1124 ◽  
Author(s):  
Murtada Abass A Alrubaie ◽  
Roberto A Lopez-Anido ◽  
Douglas J Gardner ◽  
Mehdi Tajvidi ◽  
Yousoo Han
Keyword(s):  
Flexural Strength ◽  
Power Law ◽  
Creep Behavior ◽  
Viscoelastic Behavior ◽  
Creep Recovery ◽  
Wood Plastic Composite ◽  
Power Law Model ◽  
Plastic Composite ◽  
Thermally Modified Wood ◽  
Modified Wood

The viscoelastic behavior of an extruded wood plastic composite (WPC) made from thermally modified wood under hygrothermal treatment was studied and modeled. Multiple three-point bending creep/recovery tests were carried out using a dynamic mechanical thermal analyzer (DMTA) equipped with a submersible clamp. WPC specimens with a 15-mm span were subjected to two initial applied stresses; 9% and 14% of the flexural strength in 30 min of creep and 30 min of creep recovery under the combined effects of temperature (25°C, 35°C, and 45°C) and water immersion (saltwater (SW) and distilled water). A dry condition WPC control was used to compare the hygrothermal effects with respect to the control conditions. The WPC material in this article exhibited a linear viscoelastic behavior under the effect of temperature, whereas a nonlinear viscoelastic behavior was observed under immersion conditions. A power law model is considered a useful model to describe the creep behavior of WPC specimens with a 15-mm span in the control and the SW conditions and at 45°C. A power law model was used to describe 180-day creep deflection of WPC lumber beams with an 853-mm span subjected to 12 MPa of the flexural strength in four-point bending at 50% relative humidity and at 21°C. The power law model predicts that the WPC lumber will reach a flexural strain in outer fiber of 1% in approximately 150 years.

Effect of Weathering on the Mechanical Properties of HDPE/Rice Straw Composite

2016 ◽  
Vol 860 ◽  
pp. 69-72 ◽  
Author(s):  
Yehia M.S. El Shazly ◽  
Mohamed H. El Nemr ◽  
Ashraf A. Mubarak ◽  
Mohamed H. Zaki
Keyword(s):  
Mechanical Properties ◽  
Rice Straw ◽  
High Density Polyethylene ◽  
High Density ◽  
Wood Plastic Composite ◽  
Plastic Composite ◽  
Polyethylene Wax ◽  
Straw Composite

In recent years, Wood Plastic Composite (WPC) has found widespread applications in the field of construction, decoration and furniture. In this work, the effect of weathering on the mechanical properties of WPC made from high density polyethylene (HDPE) and rice straw particles (RS) has been studied. Different loading of composite (20, 35 and 50% RS) were tested. Polyethylene wax (PE-wax) and UV-stabilizer were also added to assess their effect on the WPC composite.

scholarly journals Pemanfaatan Container Menjadi Ruang Isolasi Apung Sebagai Alternatif Bagi Pasien Covid-19

Syntax Idea ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 383
Author(s):  
Siti Dwi Lazuardi ◽  
Akhdan Muhammad Muaz ◽  
Dina Fatimatuz Zahroh ◽  
Altalariq Pranantha Yudha Airlangga ◽  
Afyfah Ramadhani Dias Saputri
Keyword(s):  
High Density Polyethylene ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
High Density ◽  
Cost Ratio ◽  
Wood Plastic Composite ◽  
Benefit Analysis ◽  
Benefit Cost Ratio ◽  
Plastic Composite ◽  
Benefit Cost

Kasus COVID-19 hingga saat ini terus mengalami peningkatan, terlalu banyaknya pasien yang membutuhkan perawatan intensif mengakibatkan rumah sakit mengalami kondisi overloaded capacity. Dalam rangka meminimalisir adanya pasien rawat mandiri dan berisiko adanya cluster keluarga, maka pemanfaatan container menjadi ruang isolasi apung sebagai alternatif bagi masyarakat untuk mendapat penanganan intensif COVID-19. Pemanfaatan container bekas 20 feet dipadukan dengan alas untuk mengapung berbahan HDPE (High-Density Polyethylene) dan alas pijakan WPC (Wood Plastic Composite). Dalam mempertimbangkan besaran biaya serta mengukur keoptimalan dari manfaat penelitian, maka penilitian ini menggunakan metode CBA (Cost-Benefit Analysis) dan metode BCR (Benefit Cost Ratio) untuk menguji kelayakan dari penelitian ini. Hasil penelitian menunjukan bahwa pemanfaatan container bekas menjadi ruang isolasi apung termasuk dalam kategori baik, dimana penelitian ini dapat menekan angka pasien isolasi mandiri sebesar 35% dan hasil perhitungan manfaat memiliki rasio sebesar 1,02 dan menghasilkan nilai NPV positif dengan batasan kelayakan yaitu BCR > 1, dan NPV > 1. Dari hasil penelitian tersebut, dapat disimpulkan bahwa, ruang isolasi apung ini layak untuk direalisasikan atau dioperasikan.

scholarly journals Effective Adsorptive Removal of Methylene Blue from Water Using Wood- Plastic Composite Containing High Density Polyethylene and Wood Particles

2021 ◽  
Author(s):  
Zahra Ranjbarha ◽  
Javad Mokhtari Aliabad ◽  
Parviz Aberoomand-Azar ◽  
Seyed Amin Mirmohammadi ◽  
Mohammad Saber-Tehrani
Keyword(s):  
Methylene Blue ◽  
High Density Polyethylene ◽  
Textile Industry ◽  
Contact Time ◽  
Cost Effective ◽  
Homogeneous System ◽  
High Density ◽  
Wood Plastic Composite ◽  
Plastic Composite ◽  
Adsorbent Surface

Abstract In this study, the ability to remove methylene blue cation pigment using wood-plastic composite containing high density polyethylene and wood powder as a recycled material was studied. The effect of some important parameters such as pH, adsorbent amount and contact time were investigated. Adsorption efficiencies for methylene blue was maximized at alkaline pH. Adsorption capacity increased with increasing adsorbent amount and contact time. The value of R2 in Langmuir model was equal to 1 and the separation factor for 0.5 and 1 g of adsorbent were 0.09 and 0.1, respectively. Given that the methylene blue adsorption data were more consistent with the Langmuir isotherm model, it can be stated that the wood-plastic composite probably has uniform adsorption surfaces and the adsorption process occurred in homogeneous system on the adsorbent surface. Based on the results of this study, it was observed that this composite is a suitable adsorbent for removing methylene blue from aqueous solutions and used as a purifying agent in the decolorization of effluents containing pigments. This adsorbent is recyclable and is cost-effective to remove dye from textile industry wastewater.

scholarly journals Assessment of the stepped isothermal method for accelerated creep testing of high-density polyethylene

2021 ◽  
Author(s):  
Gerald Pilz ◽  
Stefan Wurzer ◽  
Matthias Morak ◽  
Gerald Pinter
Keyword(s):  
Creep Behavior ◽  
High Density Polyethylene ◽  
Creep Compliance ◽  
High Density ◽  
Creep Testing ◽  
Time Range ◽  
Master Curves ◽  
Isothermal Method ◽  
Temperature Levels

AbstractThermoplastic materials are increasingly used in demanding structural applications under, in some cases, long-term static loading over several decades. In this regard, the stepped isothermal method (SIM) with creep testing at stepwise increased temperature levels in combination with time-temperature superposition (TTSP) provides a very time efficient procedure for long-term creep characterization. In the present study, the creep behavior of an injection molded high-density polyethylene material (HDPE) was investigated by SIM in the thermally untreated state as well as after annealing.Due to experimental issues regarding the heating behavior of the specimens and non-linear viscoelastic behavior, particularly at elevated temperatures, bi-directional curve shifting was required in order to generate meaningful master curves for creep compliance. In a first step, an Arrhenius equation was used for the horizontal curve shifting, based on activation energies, determined in additional multi-frequency dynamic mechanical analysis (DMA). Continuous master curves were then obtained by empirical vertical shifting of the individual creep curve segments for the different temperature levels. In general, good agreement was observed between the resulting SIM master curves and the corresponding conventionally measured creep compliance curves at least for a time range up to 300 hours. Furthermore, significant differences in the creep tendency of the annealed material state compared to the thermally untreated condition revealed the distinct influence of the thermal history on the resulting creep behavior.

Mechanical Properties and Thermal Conductivity of Coal Ash-Recycled High-Density Polyethylene Composite

2018 ◽  
Vol 06 (01n02) ◽  
pp. 1850002
Author(s):  
Ban M. Alshabander ◽  
Awattif A. Mohammed ◽  
Asmaa Sh. Khalil
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
High Density Polyethylene ◽  
Waste Product ◽  
Construction Materials ◽  
Coal Ash ◽  
High Density ◽  
Plastic Composite ◽  
The Impact ◽  
Recycled Hdpe

In this study, coal ash/recycled plastic composite material was fabricated with post-consumer high-density polyethylene (HDPE) and coal ash particles. The main idea of using coal ash, since it is also a waste product, as reinforcing filler in recycled HDPE is to reduce the cost, develop lightweight and produce environmental-friendly materials. Coal ash/recycled plastic composite have been used in significant applications as construction materials including flooring, landscaping, fencing, railing window framing and roof tiles. Effect of coal ash loading on the mechanical properties and thermal conductivity of coal ash/recycled HDPE composite were determined. It is expected to use waste materials in new field by getting novel composite materials with developed mechanical properties. It was found that coal ash filler indicated significant improvement on the mechanical properties of composites. The results show that the impact decreased tremendously from 57.32 to 15.8[Formula: see text]kJ/m2 with only 30[Formula: see text]wt.% loading of coal ash. The filler increases the elasticity of the material and reduces its ability to absorb deformation energy.

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