Pavement Condition Index

The Pavement Condition Index is a numerical index between 0 and 100 and is used to indicate the condition of a roadway. It is widely used in transportation civil engineering. It is a statistical measure and requires manual survey of the pavement.

The Pavement Condition Index (PCI), developed by the United States Army Corps of Engineers [ [http://ntlsearch.bts.gov/tris/record/tris/00183146.html Tris Online: Development Of A Pavement Condition Index For Roads And Streets ] ] , is based on a visual survey of the pavement and a numerical value between 0 and 100 defines the condition with 100 representing an excellent pavement. The process involves the following steps:

•Divide the total pavement section into sample units (approximately 5000 square feet).

•Based on the number of sample units in the total section, a certain number of these units are selected to be tested. For example if there are 40 or more sample units, 10% are tested.

•The type, extent and severity of pavement distress in each section are recorded using the ASTM Standard D 5340 method.

•The PCI of each tested sample unit is calculated using the method defined in the standard. In summary this involves calculating the distress quantities and the distress densities for each tested unit. These values are used to determine a deduct value and this deduct value is subtracted from 100 to give the PCI value. •The PCI of the total section is then determined based on the sample values.

This condition index can give a good indication of the pavement condition of a network [ [http://www.nytimes.com/2008/01/26/us/26build.html?scp=4&sq=pavement&st=nyt Building Costs Deal Blow to Local Budgets - New York Times ] ] . However, trained personnel are required to complete the complicated survey procedure. [http://training.ce.washington.edu/WSDOT/ Washington State DOT pavement guide]

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