Smoothness Specifications for Pavements Final Report (1997) / Chapter Skim
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Chapter 6. Summary and Conclusions
Chapter 6. Summary and Conclusions
Pages 201-208
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From page 201... ...
These analyses include an evaluation of the effect of initial pavement smoothness on the future pavement smoothness and on He life of the pavement. Also included is an analysis of the effect of smoothness specifications on the resulting initial pavement smoothness levels and an investigation of the most cost effective smoothness levels based on life cycle cost analyses.
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From page 202... ...
, which is used by 41 percent of the responding agencies on AC pavements and by 64 percent of the responding agencies on PCC pavements. Common profiIograph levels established by highway agencies for corrective action are 10 to 15 in/ml (0.16 to 0.24 m/km)
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From page 203... ...
9. Linear regression analysis conducted on Stat~furTushed roughness data revealed that initial pavement smoothness is a significant factor influencing the future smoothness of the pavement in 80 percent of the new construction projects and in 70 percent of the AC overlay construction projects (at a significance level of 10 percent)
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From page 204... ...
16. The results of the analysis strongly indicate Mat nutial pavement smoothness has a significant effect on pavement life, using both roughness model and pavement failure analysis techniques.
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21. From the available data, it appears that AC pavements are generally constructed smoother than PCC pavements, although significant reductions in initial pavement roughness were observed for all pavement types.
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From page 206... ...
28. Although mechanical filter type pavement smoothness measuring equipment, such as the Mays Meter and the California ProfiIograph, have been used for measuring initial rideability for many years win generally good success, the inherent weaknesses of response-type roughness measuring systems (inadequate repeatability, poor correlation with user response, speed sensitivity, and lack of a "true" profile measurement)
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From page 207... ...
34. To optun~ze We effectiveness of initial smoothness measuring equipment, it should measure store Process and renort Profile data ranidiv using an correlation over 1~1 and me expense requlrect tor changing to the statistic does not appear justified.
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From page 208... ...
In comparison with actual current pay adjustment curves, the theoretical pay adjustment curves developed In this study showed, on the whole, much greater incentive amounts and much more punitive disincentive amounts. To ensure the ability to accurately measure pavement surface profiles In the wavelength ranges necessary for cleterm~ning the recommended statistics, equipment used for measuring initial pavement smoothness should meet the requirements listed In table 51.
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