Waste-based eco-material: physical and mechanical behavior
Abstract
Barley straw is a residue that is used as animal feed, however, only a small proportion has this purpose, the rest has become an environmental problem due to the large quantities generated each year. On the other hand, high-density polyethylene is one of the plastics with the most presence in municipal landfills, mainly due to the various uses it has been given. In order to continue with the concept of sustainable development, in this study, both residues were used as raw material in the manufacture of particle board, thus providing an alternative for final disposal. The objective of this research was to characterize the physical and mechanical properties of the material produced by means of the German DIN regulations. An experimental design 23 was carried out to find out the possible combinations with the variables, barley straw particle size, PC, (0.425, 0.60 and 1.00 mm) and barley straw/high-density polyethylene ratio, PC/HDPE, ( 40, 50 and 60%). The hygroscopic properties evaluated were water absorption (AA) and thickness swelling (HE) during 2 and 24 h of immersion in water. Modulus of rupture (MOR) and modulus of elasticity (MOE) were evaluated to determine the mechanical behavior of the boards. According to the DIN 68 761 standard, the 9 boards produced comply with the provisions of water absorption for general use. Regarding the MOR, the values fluctuated from 20.5 to 26.5 MPa, exceeding what is stipulated by the DIN 52 362 standard. The MOE had results ranging from 1879 to 2585 MPa, lower than other values reported for boards made with similar raw materials.
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References
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