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Shahiron Shahidan - One of the best experts on this subject based on the ideXlab platform.

  • Concrete Incorporated with Optimum Percentages of Recycled Polyethylene Terephthalate (PET) Bottle Fiber
    International Journal of Integrated Engineering, 2018
    Co-Authors: Shahiron Shahidan
    Abstract:

    Plastic solid waste generation increases every year with the current consumption habit prevalent in the society nowadays. The improper disposal of plastic has been a major concern to the environment as it is not easily degradable. The issue of environmental pollution caused by Polyethylene Terephthalates (PET) has been extensively discussed and the best solution proposed is recycling. Therefore, one of the potential means to the problem is to recycle Polyethylene Terephthalate (PET) in the construction industry as fiber concrete (FC). FC is a composite material resulting from the addition of fibers to ordinary concrete. The objective of this research is to determine the mechanical properties and the optimum percentages of recycled Polyethylene Terephthalate (PET) fibers in ordinary concrete. In this study, straight and irregular recycled Polyethylene Terephthalate (PET) fibers were used. The fibers were simply cut from Polyethylene Terephthalate (PET) plastic bottles. The length and width of recycled Polyethylene Terephthalate (PET) fiber were fixed at 50 mm and 5 mm respectively. The percentages of recycled PET fibers added in the concrete mix were 0.5%, 1%, 1.5% and 2.0% respectively according to the volume of concrete to continue research of Ochi et al. (2007). A water-cement ratio of 0.45 was accepted for all ranges. The tests that were conducted included the slump test, compressive strength test and splitting tensile strength test. The specimens were tested on day 7 and day 28 after the concrete was mixed. The results obtained from each test indicated that when the percentage of recycled Polyethylene Terephthalate (PET) fiber used increases, the values obtained from the slump test and compressive strength test decreases while the value obtained from the splitting tensile test increases.

Stephen A. Miller - One of the best experts on this subject based on the ideXlab platform.

Partho Neogi - One of the best experts on this subject based on the ideXlab platform.

Robert H Lambeth - One of the best experts on this subject based on the ideXlab platform.

  • recycled Polyethylene Terephthalate as a new fff feedstock material
    Additive manufacturing, 2018
    Co-Authors: Nicole E Zander, Margaret Gillan, Robert H Lambeth
    Abstract:

    Abstract Reclaimed materials such as waste plastics can be utilized in additive manufacturing to improve the self-reliance of warfighters on forward operating bases by cutting costs and decreasing the demand for the frequent resupplying of parts by the supply chain. In addition, the use of waste materials in additive manufacturing in the private sector would reduce cost and increase sustainability, providing a high-value output for used plastics. Experimentation is conducted to process Polyethylene Terephthalate bottles and packaging into filament that can then be used for additive manufacturing methods like fused filament fabrication, without the use of additives or modification to the polymer. The chemistry of different Polyethylene Terephthalate recycled feedstocks was evaluated and found to be identical, and thus mixed feedstock processing is a suitable approach. Rheological data showed drying of the recycled Polyethylene Terephthalate led to an increase in the polymer’s viscosity. Thermal and mechanical properties were evaluated for filament with different processing conditions, as well as printed and molded specimens. Crystallinity ranged from 12.2 for the water cooled filament, compared to 24.9% for the filament without any active cooling. Tensile results show that the elongation to failure was similar to an injection molded part (3.5%) and tensile strength of 35.1 ± 8 MPa was comparable to commercial polycarbonate-ABS filament, demonstrating the robustness of the material. In addition, three point bending tests showed a similar load at failure for a select long-lead military part printed from the recycled filament compared to parts printed from commercial filament. Thus filament from recycled Polyethylene Terephthalate has the capability for replacing commercial filament in printing a diverse range of plastic parts.

Laurent Mialon - One of the best experts on this subject based on the ideXlab platform.