05/09/2005 Council Packet - Laserfiche WebLink

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• • III. PAVEMENT CONDITION REPORT PAVEMENT LIFE CYCLE Pavements have a useful life beginning from the time they are constructed until they have deteriorated to the extent of being unusable. Figure 1 shows the typical life expectancy of pavement. While the actual useable life of roadways can vary somewhat due to different factors, as indicated by this graph pavement begins to deteriorate shortly after construction at a fairly constant rate and then deteriorates more rapidly as the pavement ages and its condition declines. Figure 2 shows the timely scheduling of sealcoating and overlaying and their effect on extending the useful life of the roadway. The graph shows the normal performance (life cycle) curve of pavement from new condition to problem condition within 30 years. The graph also shows how the periodic sealcoating and overlaying reverses the declining condition, returning the pavement to a much better condition and extending its useful life to approximately 65 years. ROADWAY PAVEMENT CONDITION EVALUATION Over the past year, the City and TKDA investigated and evaluated every block of city pavement to establish its condition based upon what defects each block contained. City records were investigated to obtain knowledge of how old each block is and what maintenance has occurred throughout its history. This information was then entered into a computerized program (CarteGraph Navigator), a nationally accepted computer program. This computerized program identifies and analyzes all defects in each block of road and records it together with all relevant information concerning that block to determine the comparable condition of the roadway The program rates the roadways by using an Overall Condition Index (OCI) having a 1 -100 scale with 100 being a perfect new roadway. It then projects the OCI of a segment and gives budget - dependent maintenance protocols for a given time period.