ABSTRACT
ABSTRACT: The fracture characteristics of Cold In-place Recycling (CIR) mixtures are discussed in this research on the basis of fracture energy measured according to ASTM D 7313-07: “Standard Test Method for Determining Fracture Energy of Asphalt-Aggregate Mixtures Using the Disk-Shaped Compact Tension Geometry”. An experimental design was conducted in an effort to understand the variables that can impact the fracture energy of CIR mixtures measured at –20ºC. The following variables that materials designers have control over were investigated: two emulsion types, three emulsion contents and two additive conditions. The variables that significantly affected the fracture energy of CIR mixtures were emulsion type and emulsion content. As long as other critical mixtures properties are not adversely affected, an increase in emulsion content is expected to significantly improve the fracture resistance of CIR mixtures.
