Influence of Rubber Latex on Dynamic Modulus of Hot Mix Asphalt Concrete | Abstract
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Influence of Rubber Latex on Dynamic Modulus of Hot Mix Asphalt Concrete

Author(s): Enwuso A. Igwe, Emmanuel O. Ekwulo

Characterization of material property is fundamental in the Mechanistic-Empirical design of flexible pavement. One of such key material property is the modulus of the material which influences tensile strain levels and also necessary for the prediction of fatigue cracking of asphalt pavement. It is on this basis, that the present study was directed towards exploring techniques that will improve the performance of flexible road pavement by modifying the asphalt concrete modulus; in particular dynamic modulus, E* through rubberization. The results of the study revealed that the addition of rubber latex into the asphalt concrete mixture produced positive significant changes in the dynamic modulus of the asphalt concrete at varying loading frequencies. Result showed that the dynamic modulus increased from 68,098.83 PSI to 73,188.27 PSI at 0.1Hz; 98,371.65 PSI to 105,719.22 PSI at 1Hz; 126,497.49PSI to 135,945.83PSI at 5Hz; 144,215.28 PSI to 154,987.01 PSI at 10Hz and 184,893.58 PSI to 198,703.64 PSI at 25Hz. However, threshold rubber latex content to attain maximum dynamic modulus corresponded to 0.5% at the loading frequencies investigated, that means further addition of rubber latex resulted in reduction in the value of the modulus. The Asphalt Institute Dynamic Modulus prediction model was adopted in the study.