Development of PavementBlock from High Density Polyethylene Plastic Bag Wastes

Abstract

Currently, there are many problems with the disposal of plastic waste in Thailand. This waste is difficult to decompose, remains in the environment and affects organisms in the ecosystem. This research aimed to study and developed the pavement block from high-density polyethylene (HDPE) plastic bag waste by partially mixed with river sand. The ratios of binder to sand and plastic bag to binder are 50:20, 50:25 and 50:30 gram, respectively. All materials were heated and mixed and then compressed using a handmolding machine (mold size 4.5x4.5x4.5 centimeter). The physical and mechanical properties of pavement block were evaluated. The tests of physical properties and mechanical properties, including compressive strength and water absorption, were evaluated. The results showed that every aspect ratio of binder can be formed into pavement block that does not fracture but hasvarying strength. The ability to absorb water tended to vary with the amount of plastic. The compressive strength was lower than the standard (Industrial Product Standard 827-2531) in all conditions. Therefore, this pavement block is not suitable as a compressive strength material, such as for paving a road.However,it can be used as a non-load bearing material, such as a garden path. The results of this study can be used as a guide for the use of HDPE plastic bag waste in households and communities. However, the molding method should be improved to achieve higher compressive strength according to the standards. In addition, other physical and mechanical properties of pavement block were tested, such as particle size distribution, specific gravity, thermal conductivity and microstructure, which could help to recycle more plastic waste utilized and further reduce the problem of plastic waste inthe environment.