Evaluation of the Mechanical Properties of the cement treated Cold-in-Place Recycled Asphalt Mixtures

Document Type : Research Paper


1 Assistant Professor, Department of Civil Engineering, University of Zanjan, Zanjan, Iran

2 MSc. Grad., Mashhad Municipality, Mashhad, Iran

3 Associate Professor, Department of Civil Engineering, Ferdowsi University, Mashhad, Iran


Cold-in-place recycling (CIR) is an environmentally sustainable alternative for preservation of asphalt pavements. A major disadvantage of this practice is the lower strength of the cold-in-place mixtures. Addition of cement into this type of mixture is a method for increasing its bearing capacity. The effect of cement content on the mechanical properties of the cold-in-place recycled asphalt mixtures has been investigated in laboratory. Different percentages of cement have been added to the recycled asphalt mixtures mixed with an optimum percentage of emulsified bitumen and moisture, and the indirect tensile strength, resilient modulus, dynamic stiffness and fatigue life have been measured. Due to the problem of fabrication of beam specimens, traditionally, the fatigue behavior of cold-in-place recycled mixtures has been investigated using dynamic indirect tensile loading. In this research, a method has been developed for making fatigue beams of the mixture. It is found that the fatigue life, dynamic stiffness, indirect tensile strength and resilient modulus of the mixtures increase with increasing cement content.


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