is the speed of rehabilitation that impacts traffic congestion and subsequent tailpipe emissions, and what does end of life mean? Figure 1 from the Pavement LCA Conference in Illinois outlines the LCA concept. Just like LCCA, the assumptions used in an LCA will impact the analysis outcomes. CONCEPTS IN PRACTICE With any analysis, the owner must evaluate the known and the unknown before making a decision. For a single structure or asset, the analysis may be straightforward. A toll road operator must consider the cost of building the pavement and maintaining a minimum functional service level. If a user pays to save time by using a toll road, they expect it to be smooth and safe with infrequent interruptions due to maintenance. For a transportation agency with numerous roads, bridges, tunnels, sound walls, etc., over thousands if not tens of thousands of MORE THAN MEETS THE EYE: UNDERSTANDING LCCA AND LCA △ continued from page 13 continues on page 16 △ Many asphalt pavement sections around the U.S. and Virginia are still performing. They may not have the original surface, but routine maintenance has restored their functional characteristics and, in some instances, increased their structural capacity. Many miles of pavement have been in service for 50 or 60 years, two and a half or three times longer than ever designed. Robert O. Norris Bridge Deck Overlay 14 FALL/WINTER 2024
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