Evaluating ThePerformance of Asphalt Concrete Mixes by Utilizing Carbon Black as AsphaltModifier

Abstract

Carbon black produced from several factories in Iraq is expected to provide a reinforcing agent for asphalt paving materials. Carbon black has many characteristics that distinguish it from conventional mineral fillers, as well as their different function in pavement mixtures. Theory and exerciseadvanced in the inclusive utilize of carbon black as a reinforcing agent for rubber has led to concept of asphalt reinforcement. The very fine particles of micro filler added in different contents will be dispersed in asphalt cement improving the mechanical properties of asphalt concrete mixes. In thisFourpercentages rates were utilized; 0, 3, 6, and 9 percent adding to asphalt grade (60-70). Mixes of asphalt concrete were destined at their optimum asphalt content (OAC) then experienced to assess their engineering characteristics that contain moisture of damage, permanent deformation, modulus of resilient and characteristics of fatigue. These characteristics have been assessed utilizing indirect tensile strength, uniaxial repeated loading and repeated flexural beam tests. Mixtures improved with carbon black were existed to have amended permanent deformation and fatigue characteristics, else exhibited high resilient modulus and lower moisture susceptibility. Result showed that a rate changed from 3 to 9 percent has shown an increase in resilient modulus for increment of carbon black and modulus of resilient for mixes with 9 percent carbon black was 1.4 times that for mixes with 0 percent carbon black. The altering of carbon black from a range (3-9) percent has modified the fatigue property of the asphalt concrete mixes as determined by flexural test, Significantly, to modify the asphalt concrete manner taken the percent of carbon black 6, and to produce the mixes more durable , higher resistance to distresses by adding the local knowledge.