Marshall Test Characteristics Of Ac-Bc Mixture To Determination Of Optimum Asphalt Content And Marshall Immersion Index Using Portland Composite Cement As Filler

Currently, the construction of road transportation facilities in Indonesia for pavement was still dominated by the
used of asphalt. The most widely used type of asphalt for road pavement was asphalt derived from petroleum distillation,
which was then known as petroleum bitumen. Today there were many power plants that use coal as fuel. The by-product of
burning coal was fly ash, which is classified as a pollutant material. Marshall characteristic test is one of the tests carried
out to test the strength and void characteristics produced by asphalt mixtures, including asphalt concrete binder course
(AC-BC) mixtures. Marshall characteristics can also be used to determine the optimum asphalt content and Marshall
immersion index of asphalt mixtures. This study aims to determine the optimum asphalt content and Marshall immersion
index of the AC-BC mixture using portland composite cement as filler. The gradation of the AC-BC mixture as were
50.00% of coarse aggregate, 45.15% of fine aggregate and 5.85% of filler. AC-BC mixture were produced using petroleum
bitumen of 60/70 grade penetration at variations in asphalt content of 4.0%, 4.5%, 5.0%, 5.5%, and 6.0% by estimated
asphalt content. The results showed that the optimum asphalt content of the AC-BC mixture was 5.5% with Void in Mix
(VIM) value of 4.35%, Void Filled Bitumen (VFB) of 71.84%, Void in Mineral Aggregate (VMA) of 14.84%, stability of
812.04 kg, flow of 3.17 mm and Marshall Quetiont of 255.81kg/mm, respectively. The value of residual strength
(immersion index) for 24 hours from the results of the Marshall Immersion test was 96.21% for AC-BC mixture.