Characteristic of Coconut-Shell Ash as Filler and LDPE Plastic Waste as Substitution Materials of Porous Asphalt Mixtures

Abstract

Porous asphalt is designed to have a relatively higher porosity than other pavement types, this porous property is obtained because the proportion of fine aggregate is less than other types of mixtures. In an effort to increase the strength of porous asphalt pavement structures, it is required to use other added materials both as additives, stabilizers and substitution materials. In this study, the added material used was low density polyethylene (LDPE) plastic waste as a substitute for asphalt and coconut-shell ash (CA) as filler substitution material. Stone ash, cement and fly ash are commonly used as fillers in asphalt mixture, CA is expected to be one of the alternatives. This study aims to determine the characteristics of using LDPE into asphalt pen. 60/70 and the use of 50% CA filler on the characteristics of porous asphalt mixture and to find out indications of deficiencies and strengths in the asphalt mixture. On the initial bitumen content without using substitutes, the optimum bitumen content (OAC) was 5.76% with the variation used of LDPE 3%, 5% and 7% and 50% CA as filler. At OAC value 5.76% with 3% LDPE substitution meet all required parameter. With the value of Marshall Stability, VIM, Flow, AFD, and CL are 560.50kg, 18.61%, 4.3mm, 0.22% and 19.69% respectively.