Flexural strength of beam concrete with PET plastic addition and 30% copper slag

Civil Engineering Study Program, Universitas Negeri Surabaya, Surabaya, East Java

^* Corresponding author: mochamadfirmansyah@unesa.ac.id

Abstract

The development of renewable concrete materials has long been carried out by researchers about concrete to find alternative materials that allow it to be used as a substitute material for the use of concrete. Alternative materials can be obtained from waste materials or wasted materials from industrial products and how the manufacture of concrete is said to be environmentally friendly concrete. Copper slag is the result of copper processing waste in the form of sandy material and plastic with various types of PET, that can be found in household waste. Therefore, the objective of this study is to calculate the technical strength of the concrete beam with additional material in the form of 30% copper slag and variations of the addition of PET plastic. This research was conducted experimentally with compressive strength testing with cylindrical specimens 10 cm in diameter and 20 cm in height and beam testing with a size of 15 cm x 15 cm and a length of 53 cm according to bending beam testing standards without reinforcement. Variations of PET plastic used in concrete mixtures with 30% copper slag are 0.3%, 0.6%, and 0.9%. The results of this study show that the compressive strength value of concrete with copper-slag of 30% and PET plastic of 0.6% gives a maximum compressive strength value of 27.5 MPa, and the value of flexural strength obtained is 5.03 MPa. The optimum deflection after adding PET plastic occurs in a mixture of 0.6% PET plastic which is 0.45.