Using Reclaimed Asphalt Pavements to Improve Subgrade Soil Properties in Kuwait (05-0213)
Ahmad H. Aljassar, Kuwait University
Sayed Metwali, Ministry of Public Works, Kuwait
Mohammed Ahmed Ali, City of Lethbridge
Fawaz Al-Shammari, Ministry of Public Works, Kuwait

The use of reclaimed asphalt pavements to improve subgrade soil properties has been extensively used in the United States since the seventies. The technique is a simple one, in which milled asphalt is mixed with subgrade soil to produce a better quality subgrade layer. Asphalt milling is a major pavement maintenance activity of the Ministry of Public Works in Kuwait, where approximately 380,000 tons of milled asphalt concrete is produced annually. This paper presents the local experience in using this material to improve the bearing capacity of subgrade soil. Several roads were constructed on improved subgrades using this technique, which resulted in major cost savings and better performance of roads. Laboratory and field test results are presented along with capital construction savings.