Engineering

Engineering

What is meant by the term pavement rehabilitation management? Describe three strategies used by public agencies to develop restoration and rehabilita.t ion programs. 21-2 What are the three principal uses for pavement condition data? 21-3 What is the difference between PSI and PSR? 214 Draw a sketch showing the relationship between pavement condition (expressed as PSI) and time for a service life of 20 yr if the PSI values range from 4.5 to 2.5 in a 6-year period and then the pavement is resurfaced such that the PST is increased to 4,0. After another 6 years, the PSI has reached 2.0, but with a rehabilitated pavement in place. PSI is increased to 4.5. At the end of its service life, the PSI value is 3.4. 21.5 Describe the four characteristics of pavement condition used to evaluate whether a pavement should be rehabilitated, and if so, determine the appropriate treatment required_ 21-6 A given pavement rating method uses six distress tvpes to establish the DR. These are corrugation. alligator cracking, raveling, longitudinal cracking, rutting, and patching. For a stretch of highway, the number of points assigned to each category were 6, 4, 2, 4, 3, and 3. If the weighing factors are 2. I, 0,75, 1. 1, and 1.5. determine the DR for the section