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.

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Plastic waste has a negative effect on the environment since it could not be decomposed easily, and it could decrease soil fertility. One way to decrease plastic waste is by mixing it with sand to make paving blocks, because the characteristic of plastic is elastic and flexible, so it is expected that the material will be ductile and strong. Material of this study used LDPE (Low Density Polyethylene) plastic which was chopped and mixed with 6 mesh sand with variation of 1 kg (plastic): 5 kg (sand) and 1 kg (plastic): 7 kg (sand) (1:5 and 1:7). The sand was inserted into mixing machine with 200 °C temperature for 5-10 minutes, after that the chopped plastic was inserted and mixed for 30-35 minutes. Molding process was done by pressure tool. After that testing was done by using compressive machine and run over vehicle. The research result showed that the lowest damage occurred on plastic and sand composition of 1:5 as much as 0.113% and had compressive strength 16.667 MPa, and the highest damage occurred on plastic and sand composition of 1:7 as much 0.267% and had compressive strength 12.963 MPa.

Activated carbon is a multipurpose material due to its unique properties such as high surface area and pore volume. The reduced carbon source from coal has led to the development of activated carbon from lignocellulosic material. However, there is limited literature reported the use of swat bamboo (Gigantocholoa verticillata) as an activated carbon precursor. In this research, swat bamboo has been converted to activated carbons under different carbonization temperatures of 550, 650, and 750OC and activation durations of 1.5 and 2 h. The results show that at activation time of 1.5 h, increasing carbonization temperature affecting the higher pore volume and surface area gained. The optimal characteristics of activated carbon were obtained at a carbonization temperature of 750OC and activation time of 1.5 h. This due to the activated carbon produced in this condition has the highest pore volume, surface area, and adsorption capacity of 0.138 cm3/g, 135.30 m2/g, and 95.776 cm3/g, respectively. Its average pore diameter was 2.053 nm with fix carbon of 75.26% and C of 76.79%. It has a monomodal pore size distribution with the highest adsorption of 0.056 cm3/g/nm occurred at a pore size of 1.516 nm.

Activated carbon (AC) has an important role in many life fields. It has high porosity and very useful for gas mixtures separation and purification of air and water. Every application requires specific properties of AC. Characteristics of AC are strongly influenced by raw material and parameters of manufacturing process. This paper is focused to characterize of activated carbons (ACs) derived from swat bamboo (Gigantochloa verticillata) which is manufactured under different carbonization temperatures. Prepared samples of swat bamboo were carbonized by heating variations of 550, 650 and 750°C and held at such temperature for 1 hour. Char yielded is powdered and meshed to maximum grain size of 250 um and then physically activated by heating up to 800°C, held for 1 hour by flowing of 150 mL / min nitrogen. The results show that there was an increase in fix carbon and carbon contents from raw material to char and from char to ACs yielded; there were a little bit increase of fix carbon and carbon contents proportional to increasing of carbonization temperature. The maximum fix carbon (74.73%) and C (75.52) were obtained at carbonization temperature of 750°C. SEM observation showed that there has been a change in the morphology microstructure from raw material to activated carbons, wherein the ACs the pores structures clearly can be observed.