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IMS Infrastructure Management Services Arden Hills Report P a g e | 3 <br />As illustrated in Figure 2, typically, pavements start deteriorating rapidly once they hit a specific threshold. <br />A nominal investment in cheaper surface treatments at 40% lifespan is much more effective than deferring <br />maintenance until heavier overlays or possibly reconstruction is required just a few years later. Streets that <br />are repaired while in good condition will have an extended lifetime and will cost less over their lifetime than <br />those left to deteriorate to a poor condition. Without an adequate routine pavement maintenance program, <br />streets will require more frequent reconstruction, thereby costing millions of extra dollars. <br />The goal of the pavement management program is to develop policies and practices to delay the inevitable <br />total reconstruction for as long as practical through application of routine M&R strategies while pavements <br />are within the target zone of cost-effective pavement preservation. That is, as each roadway approaches <br />the steepest part of its deterioration curve, apply a surface treatment that extends the pavement life, at a <br />minimum cost, avoiding costly heavy overlays and reconstruction down the line. The key to a successful <br />pavement management program is to develop a reasonably accurate deterioration curve of the pavements, <br />and then identify the optimal timing and rehabilitation strategy. The outcome of this exercise is the long- <br />term cost savings and increase in network level pavement quality over time. Figure 3 illustrates the concept <br />of extending pavement life through the application of timely M&R activities. <br />A successful pavement management program requires periodic updates in pavement conditions, <br />deterioration models, and cost models, and evaluation of the effectiveness of M&R activities. <br /> <br />Figure 3 - Pavement Life Cycle Curve <br />Extended LifeTarget Zone for <br />Pavement Preservation <br />Pavement ConditionPavement Age (Years) <br />Target Zone for <br />Pavement Overlays <br />Target Zone for Pavement <br />Rehabilitation & Reconstruction <br />10 20 30 <br />90 <br />65 <br />45