Studi Pemanfaatan Limbah Hasil Pembakaran Batu Bara (Fly-Ash) Sebagai Pengganti Semen Pada Beton Mutu Tinggi. (Studi Kasus PT. Pura Group Kudus) STUDY OF COAL BURNING WASTE (FLY-ASH) UTILIZATION AS THE SUBSTITUTION OF CEMENT IN HIGH CONCRETE ( CASE STUDY : PT PURA GROUP KUDUS

Abstract

Fly Ash is obtained from combustion waste of coal slipped off from 100-200 mesh filter. Fly Ash is one of some adding materials in concrete used as the substitution of some part of cement functioning as filler and is used to add the strength of concrete. This research aims to to understand the influence of Fly as the substitution of cement on high concrete, whereas the Fly Ash used here is obtained from PLTU PT. Pura Group Kudus. The Making of this concrete is done with 3 different quality of concrete, f'c 45 Mpa, f'c 55 Mpa and of f'c 65 Mpa. Where the rate of Fly Ash as the substitution of cement in concrete is 0%; 6%; 12%; and 18%. The results indicate that the usage of Fly Ash as the substitution of cement can improve the compress-strength equal to 11% with optimum rate of Fly Ash 9.96%, and is able to reduce to Dry Shrinkage concrete equal to 52% relative to Normal concrete, and Fly Ash is also functions as the Filler in concrete so as to make it more impermeable.