Utilization Plastic Waste Type PET (PolyEthylene Terephthalate) in the Making of Low-Quality Concrete in the City of Palangkaraya

The research about utilization plastic waste type PET (PolyEthylene Terephthalate) especially in fields of civil engineering is not much done in Palangka Raya. Even though every day in Palangka Raya, this type plastic waste is quite large. This type of waste management is still not optimal so that this type of garbage can disturb the environment in Palangka Raya. Therefore research is needed so that plastic waste can be used as civil engineering building materials in the case of a mixture of low-quality concrete. This study aims to determine whether PET (Poly Ethylene Terephthatele) plastic waste can be used as a mixture for low quality concrete in Palangka Raya City and the extent of its effect in the compressive strength of low-quality concrete. This research uses experimental methods in the laboratory. The planned concrete quality is K 225 which is classified as low quality concrete. Testing is carried out in 7, 14, and 28 days. PET plastic waste itself will be used as a substitute for coarse aggregate. The variation in the use of PET type plastic to coarse aggregate weight is 5%, 10%, and 15%. The number of samples for each condition is 3 samples so that the total sample used is 36 units. Concrete compressive strength value decreases with increasing levels of PET plastic waste. Average compressive strength fot variations in the mixture of coarse aggregate PET plastic waste 0% (normal), 5%, 10%, and 15% respectively: 272,40 kg/cm², 246,27 kg/cm², 239,82 kg/cm², dan 206,31 kg/cm². (paper)