Smoothness Specifications for Pavements Final Report (1997) / Chapter Skim
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Chapter 1. Introduction
Chapter 1. Introduction
Pages 1-6
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It is a commonly held belief ~at, all other Wings being equal, new pavements constructed with a smoother surface profile will last longer than rougher, but otherwise similar, pavements. This concept has perhaps been most widely fostered by the AASHTO pavement design models, which suggest that a pavement with a higher initial serviceability rating (that is, pavement smoothness)
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While critics concede that a smooth-r~ng pavement surface is important to the public, they question He purported benefits of an extremely smooth initial pavement profile, the basis for incentive/disincentive payments, and the suitability of current profilographs for smoothness specifications. Key questions that have been raised include: · Does a high initial smoothness really lead to a longer pavement life?
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It is also possible that inherent pavement traits may adversely affect the measurement of Initial smoothness. For example, jointed concrete pavements undergo cyclic thermal curling In response to changing temperature gradients.
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First, tune-series pavement smoothness data and pavement smoothness data measured before and after the Implementation of a smoothness specification were collected from selected SHAs. The analysis of these data provided insight as to the effect of crucial smoothness on overall rideability and on pavement life, and also indicated the relative effectiveness of pavement smoothness specifications in achieving initial smoothness levels.
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Chapter 5 describes the evaluation of smoothness measurement statistics and equipment characteristics for measuring initial smoothness and presents various recommendations for future initial smoothness testing. Finally, chapter 6 provides a brief summary of the report and proposes recommendations for Proving existing smoothness specifications.
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Conceptual illustration of pavement life estimation using regression failure curves en eeee~ Figure 42. Example plot of pavement life versus initial smoothness using the roughness model approach .
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