To Assess the Predictability of Complex Modulus of Crumb rubber Modified and Virgin Bitumen using Two Distinct Mathematical Models

Abstract

In this research two mathematical models namely Sigmoidal and Al-Qadi and Co Workers Models were used
to assess the predictability of complex modulus of Crumb rubber modified and virgin bitumen. Goodness of fit statistics
such as R2
and standard error ratio (Se/Sy) were used to assess the reliability of the Model. The results showed that both
sigmoidal and al Qadi and Co-workers model can be used to predict the complex modulus of bitumen. Sigmoidal model
parameters can be used to assess the ageing of bitumen in case of virgin bitumen but the model suffers from limitation
for Crumb rubber Modified bitumen (CRMB) as no specific observations could be made.