PerRoad is a mechanistic-based procedure for the design of flexible long-life or perpetual pavement structures. The procedure was developed at the National Center for Asphalt Technology (NCAT) at Auburn University (AU) in conjunction with the Asphalt Pavement Alliance (APA), the National Asphalt Pavement Association (NAPA) and State Asphalt Pavement Associations (SAPAs) through the Pavement Economics Committee. The program couples layered elastic analysis with a statistical analysis procedure (Monte Carlo simulation) to estimate stresses and strains within a pavement. Version 4.4 provides design results as percentile responses and as conventional designs with transfer functions. In order to predict strains that would prove detrimental for fatigue cracking or structural rutting, PerRoad requires the following inputs:

• Seasonal pavement moduli and annual coefficient of variation (COV)
• Seasonal resilient moduli of unbound materials and annual COV
• Thickness of bound materials and COV
• Thickness of unbound materials
• Load spectrum for traffic
• Location for pavement response analysis
• Magnitude of limiting pavement responses
• Transfer functions for pavement responses exceeding the user-specified level for accumulating damage

* PerRoad download link provides freeware version of the software.

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