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Pavement Condition Index (PCI), Deduct Values, and Distresses <br />Pavement distresses are dependent on pavement type and are rated by severity and extent. <br />MicroPaver provides a numerical value calculated internally based on deduct values for the <br />distresses rated per street segment.MicroPaver defines this value as Pavement Condition Index <br />(PCI) which will be the term used throughout this report. <br />A street with a PCI of 100 represents a new or recently rehabilitated street. This PCI value is the <br />basis used to analyze the surface treatment needs. Distress data are collected using Tablets and <br />then uploaded to the pavement management software. MicroPaver method rates severities and all <br />their extents for up to 20 different distresses.As the condition of a streets surface begins to <br />deteriorate,the PCI decreases. Asphalt distresses typically observed are alligatoring, longitudinal <br />and transverse cracks, rutting, and raveling. Distresses in concrete streets typically observed and <br />rated include cracks per panel, raveling, joint spalling, faulting, and crack sealing. Descriptions <br />of some common distresses are shown below: <br />Alligator Cracking:When the asphalt begins to crack in all direction it is called alligator <br />cracking. <br />Longitudinal Cracking/Transverse Cracking:These are cracks that run parallel to the <br />roadway centerline (longitudinal) and perpendicular to the roadway center line <br />(transverse).These distresses usually divide the piece into different sections and which <br />are caused by repeated traffic loading. The low-severity cracks are not considered serious <br />to the overall function and safety of the road. Medium to high-severity cracks are usually <br />caused by heavy traffic loads and environmental factors and can become very serious <br />distresses.The picture below shows longitudinal cracking. <br />7 <br /> <br />