تاثير دانه بندي مصالح اساس در زهكشي روسازي آسفالتي باند جنوبي فرودگاه بين المللي امام

Evaluation of Base Aggregate Size Effect to Drainage Quality of IKIA Second Runway

Second runway in the southern zone of IKIA is located about (2600 m) far from present northern runway and now is under construction. One of the most important issues is drainage that has been investigated in the past , by excavating a channel in approximately ( 5 km ) length and (10m) depth from east to west. The results approved that there is no peril about under ground water flow. But because of importance of IKIA , the capacity of base material to carry out of drainage, has been studied in this research by means of determining water flow which penetrate through cracks of the pavement and comparing to capacity of base material grading to passing water and entering to lateral subsurface drainage system that contained geotextile and filter material around the poly ethylene pipe. The result from this research indicated that if we use aggregate size grading in according to type IV from No. 101 code ( Iranian general and technical specification of road ), the performance of pavement will be significantly improved. This high capacity depends on effective size of aggregate called (D10 ).