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In this study, we evaluated water absorption and tensile properties of coconut filter fiber reinforced polypropylene composites. The fibers were subjected to various immersion times for 0.5, 1, and 3 h in 0.5 % acrylic acid solution at room temperature and 0.5 h at 70 oC. The treated fibers were used as reinforcement of polypropylene composites. Water absorption of treated fiber composites was lower than those of untreated fiber composite. Boiling in water significantly affect water absorption rate of the composites. The tensile strength and elastic modulus of treated fiber are higher than untreated fiber. They show a decrease in tendency when the immersion time increased. Tensile strength and elastic modulus of composites with AA-treated at 70 oC fiber are the highest.

Plastic waste especially plastic bags have not been widely reused or recycled so that the amount increases polluting the environment every day. One way to overcome this problem is by utilizing plastic waste into paving blocks as a substitute for cement. The problem is how the composition of plastic and sand. The purpose of this study is to determine the effect of using LDPE waste into a mixture of sand with ratios of 1:3, 1:5, and 1:7 with heating temperature of 200°C to the compressive strength and density of sand/LDPE composites. Based on the results of the study, the highest average compressive strength was resulted by the sample which has a ratio of 1:3 plastic and sand with 3mm sand grain and a heating temperature of 200°C which is equal to 32.7MPa. While the lowest average compressive strength was obtained by the sample which has a ratio of 1:7 plastic and sand, 3mm granules and temperature 200°C with a compressive strength of 12.0 (MPa). Increasing the mixture of plastic and sand 1:3, 1:5, 1:7 in which of the followed by increasing of density of the sample.