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

Abstract

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.