Analytical Review of the HMA Temperature Correction Factors from Laboratory and Falling Weight Deflectometer Tests

Akbarzadeh, Hossein; Bayat, Alireza; R. Soleymani, Hamid
January 2012
International Journal of Pavement Research & Technology;Jan2012, Vol. 5 Issue 1, p1
Academic Journal
The investigation of temperature dependency of asphalt mixtures and pavements has several applications in pavement engineering. To estimate the modulus of asphalt pavement layers from field deflection tests such as Falling Weight Deflectometer (FWD), it is necessary to adjust the deflections or backcalculated moduli to a reference temperature. The main objective of this study was to compare the temperature dependencies of Hot Mix Asphalt (HMA) from laboratory tests such as dynamic modulus and resilient modulus tests with the empirical models suggested for the correction of asphalt pavement modulus from FWD testing. A database including dynamic modulus of 42 asphalt mixtures as well as resilient modulus of 37 asphalt mixtures from several North American studies were analyzed to investigate the variation of their laboratory moduli with testing temperatures. An exponential model was proposed for the temperature dependency of the dynamic and resilient moduli of asphalt mixtures. Additionally, thirteen temperature correction factor models for FWD testing were reviewed. While existing pavement practices do not consider mixture dependency for temperature correction factors, this study concluded that mixture dependency of temperature correction factor is important and should be considered.


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