DEVELOPMENT OF ASPHALT MIX STIFFNESS MODULUS MODEL USING SLAG MATERIALS AND RECLAIMED ASPHALT PAVEMENT

One of the design parameters using mechanistic methods for structural evaluation of asphalt pavement is the modulus value obtained from the DSR test for asphalt modulus and UMATTA test for mixture modulus. Tests were carried out on hot mix asphalt with sixteen combinations using reclaimed asphalt pavement, EAF slag and a combination of both with a percentage of up to 30%. The result of the mixture modulus showed that the mixture with a combination of slag and Reclaimed Asphalt Pavement (RAP) gave better performance compared to the control mixture using asphalt pen 60/70 and natural aggregate. The development of the mixture modulus model was analyzed statistically with the classical assumption test and the determination of dependent variables based on the existing theoretical model. The asphalt stiffness modulus was taken from the calibrated DSR test results, asphalt mix volumetric plus the variables of the RAP and slag percentage in this study. Of the several models obtained, there were two different mixture volumetric parameters the void in mix and void filled with asphalt in the mixture both models were validated to the stiffness modulus of the mixture. From the test results obtained, the closest ratio range was the stiffness modulus of mixture model with the void in mix parameter.