Alternate Design/Alternate Bid Process for Pavement-Type Selection (2017) / Chapter Skim
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9 BACKGROUND This chapter summarizes current practices used to design and evaluate pavement on which ADAB designs are based. Pavement design and analysis is a complex subject that cannot be presented here in its entirety.
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10 presents key factors in pavement design, commonly used pavement design methodologies, and the most common pavement design methods used in states using ADAB. The available literature shows that fundamental pavement design procedures are not substantially altered to accommodate ADAB (Ahlvers 2010; Roark 2011; Duncan and Holtz 2012)
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11 The AASHTOWare® MEPDG is a pavement design software package that incorporates mechanistic models as well as empirical factors, climate, and forecasted traffic levels to simulate pavement performance over the design life. MEPDG uses laboratory performance test results of pavement materials to model and predict performance based on anticipated traffic and environmental conditions during the design life (ARA 2004)
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12 a factor when considering ADAB. One study reported that the MoDOT Design Division calculates a separate LCCA factor for shoulder pavement when considering pavement-type selection (Wimsatt et al.
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13 way agency, such as initial construction or major rehabilitation. An activity is defined by its agency costs, its service life, and its effects on highway users.
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14 and rehabilitation costs. Throughout the pavement design and economic analysis, a number of engineering judgements and assumptions are required to provide a reasonable comparison between pavement alternatives.
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15 SUMMARY Conclusions One conclusion was drawn from the information reviewed for this chapter. Based on the survey responses, most agencies use the MEPDG when performing equivalent pavement designs.
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