Mechanical Properties of Fly Ash, Gravel, and Epoxy Resin Minerals Composite

This study aims to develop mineral composites for machine tool beds. This study utilizes fly ash from coal power plants with gravel rocks. The gravel size was reduced in the ball mill to 100 mesh size. The received fly ash was used. The composition variations between fly ash and gravel fly ash are 100% fly ash, 75% Gravel-25% Fly Ash, 50% Gravel -50% Fly Ash; 25% Fly ash - 75 % Gravel, and Gravel 100%. The epoxy resin used is Bakelite® EPR 174 with Bakelite® EPH 555 hardener, where the ratio is 2 : 1. The process of mixing epoxy resin with fly ash and gravel with a mixing ratio of 82% Fly Ash Gravel and 18% Epoxy Resin. Then tensile tests, compressive tests and impact tests were carried out. From the test results, it was found that the highest density test results in the 50% gravel 50% fly ash composition were 2.03 gr / cm³, the highest tensile strength in 25% gravel 75% fly ash was 10.45 Mpa, the highest compressive strength in 50% gravel 50% fly ash was 35.99 Mpa with the highest impact energy of 0.72 joules in the 50% gravel 50% fly ash composition.