STUDY ON EXPERIMENTAL BEHAVIOUR OF CONCRETE WITH TOOTHBRUSH PLASTIC WASTE AS COARSE AGGREGATE

Abstract

Indonesia is one of the countries that cannot reduce the waste problem, especially plastic waste. The main cause is the lack of public understanding and awareness of the dangers in the future. Even though the government has implemented several regulations and methods to press the waste problem, it has not reduced the amount of value. Toothbrush Plastic waste (TPW) contributes the largest value to plastic waste apart from food packaging and household goods. The characteristics of TPW are that it is hard, heat resistant, can not rot, and has no economic value. Then, the TPW was chosen as the material for Toothbrush Plastic Waste of Concrete (TPWC), which would create a new type of lightweight concrete. This research used experimental methods to study the behavior of toothbrush waste plastic (TPW) as a substitute for concrete materials. The compositions of TPW in concrete were 2.5%, 5%, and 7.5% of the volume of coarse aggregate. The research on toothbrush plastic waste of concrete (TPWC) includes compressive strength tests, density tests, and modulus of elasticity tests. The results of compressive strength tests were TPWC 2.5 was 17.55 MPa, TPWC 5 was 16.52 MPa, and TPWC 7.5 was 14.91 MPa. The maximum stress on the three samples was 15.29 MPa, and the result of strain were TPWC 2.5 was 0.0029, TPWC 5 was 0.0039, and TPWC 7.5 was 0.0047. It is proven that if the volume of coarse aggregate is reduced, the strength value also decreases, but this does not affect the elastic modulus value.