JOB MIX LASTON (AC-BC) MENGGUNAKAN BUBUK GYPSUM DAN ABU BATA MERAH

Abstract

ABSTRACT Asphalt Coating Concrete is one type of flexible pavement, the concrete asphalt consists of fine aggregates, coarse aggregates, fillers, and bitumen with a certain level mixed in hot conditions. In a mixture of laston filler serves as a cavity filler in the mixture, increases stability, and binders concrete asphalt. In this study, researchers used gypsum powder and red brick ash filler instead of cement.This research was conducted to find out how the effect of using gypsum and red brick ash powder as filler in the laston mixture (ac-bc) in terms of Marshall characteristics. Variations in the asphalt content used in the laston mixture in this study were 5%, 5.5%, 6%, 6.5%, and 7% in which each bitumen content was made as many as 3 samples.After doing the Marshall test, it is known that with volumetric and Marshall parameters using 3 samples of each bitumen content, the average results obtained in the calculation: VMA of 17.68%, VIM of 4.46%, VFB of 74.87%, Stability amounting to 1152 kg, Flow of 2.47 mm, and MQ of 472 kg / mm. And from the results of tests or testing of Marshall characteristics, the optimum bitumen content needed in the last-mix mixture of AC-BC using powdered gypsum and red brick ash filler was 6.5%. Keywords: Laston, filler, gypsum powder, red brick ash, Marshall characteristics