The work detailed in this report represents a continuation of the research performed in phase one of this
national pooled fund study. A number of significant contributions were made in phase two of this comprehensive
research effort. Two fracture testing methods are proposed and specifications are developed for selecting mixtures
based on fracture energy criteria. A draft SCB specification, that received approval by the ETG and has been taken
to AASHTO committee of materials, is included in the report.
In addition, alternative methods are proposed to obtain mixture creep compliance needed to calculate thermal
stresses. Dilatometric measurements performed on asphalt mixtures are used to more accurately predict thermal
stresses, and physical hardening effects are evaluated and an improved model is proposed to take these effects into
account. In addition, two methods for obtaining asphalt binder fracture properties are summarized and discussed.
A new thermal cracking model, called "ILLI-TC," is developed and validated. This model represents a
significant step forward in accurately quantifying the cracking mechanism in pavements, compared to the existing
TCMODEL. A comprehensive evaluation of the cyclic behavior of asphalt mixtures is presented, that may hold the
key to developing cracking resistant mixtures under multiple cycles of temperature.
Department of Civil Engineering, University of Minnesota; University of Illinois; University of Wisconsin; Iowa State University
Marasteanu, Mihai; Buttlar, William; Bahia, Hussain; Williams, Christopher; Moon, Ki Hoon; Teshale, Eyoab Zegey; Falchetto, Augusto Cannone; Turos, Mugurel; Dave, Eshan; Paulino, Glaucio; Ahmed, Sarfraz; Leon, Sofie; Braham, Andrew; Behnia, Behzad; Tabatabaee, Hassan; Velasquez, Raul; Arshadi, Amir; Puchalski, Sebastian; Mangiafico, Salvatore; Buss, Ashley; Bausano, Jason; Kvasnak, Andrea.
Investigation of Low Temperature Cracking in Asphalt Pavements National Pooled Fund Study – Phase II.
Minnesota Department of Transportation.
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