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Lastly, it summarizes some of the key lessons learned in the process of conducting such a large-scale program, including: • Ensure strong technical leadership with management skills • Have a clear vision of the scope, size and complexity of the problem • Develop an atmosphere fostering teamwork and cooperation rather than competition • Recognize the “politics of ideas” and that researchers will defend their positions And so on. The lessons may benefit future large-scale research programs. 2 OPAC2000 method [12] The Ontario pavement analysis and cost (OPAC) was initiated in early 1970s.
34) for the estimation of the lowtemperature grade. 34) where Tmax is the high pavement design temperature at a depth of 20 mm. 0 Tair,max is the 7-day average high air temperature, Tair, max ¼ Tair, max + α1 s1 . 0 T air,max is the average 7-day maximum air temperature. s1 is the standard deviation of 7-day maximum air temperature. α1 is the reliability coefficient. Lat is the geographical latitude of the project in degrees. Tmin is the low pavement design temperature. 0 Tair,min is the low air temperature, Tair, min ¼ Tair, min + α2 s2 .
The proper integration may be a wise choice, and so the mechanistic-empirical method, empirical-mechanistic method, or analytically based method appeared. Additionally, it can be seen from the development process of the empirical design method that the results are inductive and logic based, which means they are based on the numerous measured, tested, and surveyed data, as well as engineers’ experience, with general meaning to some extent and not just the individual subjective experience. While the theoretical method is a deductive method (ie, a reasoning process based on the ideal conditions, assumptions, and rules), sometimes, the assumption as the prerequisite may be an empirical results, for example in mechanistic analysis, the pavement is assumed to be a multilayer elastic structure.