الفهرس | Only 14 pages are availabe for public view |
Abstract This study aims to create a new contractor payment method for HWY construction works depends on actual as constructed pavement performance. To achieve this objective, a comparison between as constructed and as designed pavement section was conducted by analyzing their performance using KENLA YER program through two stages. In the first stage, ESAL’s were estimated for the assumed as constructed pavement sections based on the common expected construction defects in terms of single defects as reduction in thickness ”T” or in modulus of resilience ”Mr” (140 case) or double defects, that mean combining two defects (I225 case). A case study for triple and fourth defects (IO cases) was analyzed to investigate the danger of combining defects. The second stage concerned with converting the obtained ESAL for as constructed section to ”n2” years knowing pavement design life ”n I” using the developed equation in this study. By making economical comparison of assumed common maintenance plane for as designed section versus as constructed section; contractor payment factor was created. There are 30 obtained figures for this method, from which user will use only 4 figures to apply the proposed method, depending on the type of construction defect and the design pavement life. Growth rate ”r” and money interest rate ”i” are also considered to give the new method straightness and accuracy. Finally, the study concluded that combined construction defects have great effect on pavement life consequently high difference between the traditional payment method and performance payment method obtained by considering these defects. So, it is recommended to use payment method depends on actual as constructed section perfonnance and consider it as a whole object not some separated layers during paying for contractor. |