Effect of coconut-shell ash as filler and plastic bottle as substitution of porous asphalt mixture

Abstract

Generally, porous asphalt mixtures are having low stability and highly dependent on the quality of asphalt as an aggregate binder, so the innovation of using additive needs to be examined to produce high quality asphalt. In this study, the additive used in asphalt mixtures is plastic bottle waste (Polyethylene Terephthalate/PET) and the use of coconut-shell ash (CS) as filler. This study aims to find out the influence of using PET waste and CS in asphalt porous mixtures which meets its parameter of Cantabro Loss (CL), Asphalt Flow Down (AFD), Marshall and permeability test on 60/70 asphalt penetration. Its benefit is to discover the influence of adding PET and ATK. In this research, the variation of asphalt content was made to obtain Optimum Asphalt Content (OAC) of 4.5%, 5.0%, and 6.0%. Australian Asphalt Pavement Association (AAPA) method was used to determine OAC including CL, AFD, and Void in Mix (WIM) test. After OAC was determined, OAC specimen with the variation of 0%, 2%, 4% and 6% PET substitute on asphalt weight, and the use of 50% combination of CS and portland cement from the total weight of filler were made. At OAC value of 5.74%, it is obtained that the value of CL, AFD, Marshall and permeability which meet the AAPA specifications is in the addition of 2% and 4% PET in PA mixture.