In general, difference in thickness using both versions is not significant for all practical purposes. The first national CRCP design procedures for slab thickness were developed with information from the AASHO Road Test and were included in the 1972 AASHTO. It has been found that AC sections are more sensitive to change in performance criteria as compared to PCC sections using MEPDG versions 1.0 and 1.1. Effect of change in performance criteria on the thickness of AC and PCC sections has also been investigated. The MEPDG analysis resulted in thicker PCC slab for the fifth project. Four of the PCC sections, designed using the 1993 AASHTO design guide, were thicker than the sections obtained with MEPDG. The results show that the new MEPDG analysis yielded thinner AC sections for all projects than those obtained from the 1993 AASHTO design guide analysis. WinPas 12 is available as a free download. In other words, there must be some assurance that a pavement will perform as intended given variability in such things as construction, environment and materials. WinPas 12, which is based on the commonly-used AASHTO 1993 pavement design guide, has been updated to make it compatible with current Windows-based operating systems, has a new GUI (or graphical user interface), and includes updated help screens which make the software easier to use than ever before. Five in-service Jointed Plain Concrete Pavement (JPCP) projects were reanalyzed as equivalent JPCP and AC projects using both approaches at the same reliability level. The reliability of the pavement design-performance process is the probability that a pavement section designed using the process will perform satisfactorily over the traffic and environmental conditions for the design period (AASHTO, 1993 1). The objective of this study was to compare the pavement designs obtained using the 1993 AASHTO and the new MEPDG methods for typical Portland Cement Concrete (PCC) and Asphalt Concrete (AC) pavements in Kansas. The new Mechanistic-Empirical Pavement Design Guide (MEPDG) provides methodologies for mechanistic-empirical pavement design as opposed to the empirical methodology used in the 1993 American Association of State Highway and Transportation Officials (AASHTO) pavement design guide.
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