03/13/2017 City Council Agenda - Laserfiche WebLink

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Pavement Condition Index (PCI), Deduct Values, and Distresses Pavement distresses are dependent on pavement type and are rated by severity and extent. MicroPaver provides a numerical value calculated internally based on deduct values for the distresses rated per street segment. MicroPaver defines this value as Pavement Condition Index (PCI) which will be the term used throughout this report. A street with a PCI of 100 represents a new or recently rehabilitated street. This PCI value is the basis used to analyze the surface treatment needs. Distress data are collected using ACER Tablets and then uploaded to the pavement management software. MicroPaver method rates severities and all their extents for up to 20 different distresses. As the condition of a streets' surface begins to deteriorate, the PCI decreases. Asphalt distresses typically observed are alligatoring, longitudinal and transverse cracks, rutting, and raveling. Distresses in concrete streets typically observed and rated include cracks per panel, raveling, joint spalling, faulting, and crack sealing. Descriptions of some common distresses are shown below: Alligator Cracking: When the asphalt begins to crack in all direction it is called alligator cracking. Longitudinal Cracking/Transverse Cracking: These are cracks that run parallel to the roadway centerline (longitudinal) and perpendicular to the roadway center line (transverse). These distresses usually divide the piece into different sections and which are caused by repeated traffic loading. The low -severity cracks are not considered serious to the overall function and safety of the road. Medium to high -severity cracks are usually caused by heavy traffic loads and environmental factors and can become very serious distresses. The picture below shows longitudinal cracking.