Flexural Strength of Precast Concrete Panel with Onyx Waste by Surface Grinding Finishing Process with 4mm Thickness

This paper aims to reveal the research results on Onyx waste finishing process of precast concrete panel by using grinding process. The study was conducted at the Laboratory of Structure and Construction Materials of Brawijaya University, Malang, Indonesia; therefore, the parameters of the material and workers used were parameters that existed around the test site. The specimen made was a precast panel with dimension of 40 cm × 80 cm × 6 cm which was given a minimum horizontal reinforcement that is 3Ø10. The coarse aggregates used were split stone and onyx waste. The ratio of cement, sand, and coral, respectively, 1: 1.4: 1.7 aimed to make concrete onyx with fc' above 25 MPa. The panel will be flexed by loading in-plane with a three-point loaded process. From the research conducted, it can be a fast way and process in grinding concrete panels, the coefficient of work of grinding is the flexural strength of panel after grinding.