PEMANFAATAN FLY ASH DAN BOTTOM ASH PLTU REMBANG UNTUK PEMBUATAN BETON MENGGUNAKAN SEMEN PPC

Abstract

The research aims to reduce the amount of coal burning waste of fly ash and bottom ash PLTU Rembang as a substitution of cement and sand in the production of quality concrete K-225 and waterproof using Portland Pozzolan cement. The method was experimented in the laboratory by making 50 samples of 15 x 15 x 15 cm3 test objects for 28 days, 60 days, and water absorption tests. The test objecte was made in 5 variations: normal concrete (without substitution) and 20% bottom ash substitution concrete and fly ash mixture 0%, 5%, 10%, 15%. Strong K-225 pressure occurs at the age of 60 days on bottom ash substituted concrete 20% with fly ash 0%, 5% 10% and 15% respectively of 245 kg/cm2, 254,67 kg/cm2, 250,67 kg/cm2, dan 250,67 kg/cm2. Water absorption of concrete at 28 days of ashes substitution was less than 20% and ashes flew below 0% and 5%, 10% 15% resulted in 4.85%, 5.17%, 5.05%, and 5.18%. The results of the research showed that the concrete made meets the K-225 quality and better absorption than normal concrete.