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A survey of all 50 United States was conducted in September of 1990 to determine the state of the art of crack sealing procedures on flexible asphalt concrete pavements. The results were tabulated and a summary report prepared. A meeting was held at the U.S. Army Cold Regions Research and Engineering Laboratory to discuss the draft report; the comments and suggestions received were incorporated into this report. At the meeting the group identified the need for a trade organization to develop uniform specifications and terminology and to promote proper equipment, methodology, materials, training and education in the pavement crack sealing industry.
Papers from a December 1997 symposium detail innovative and effective strategies for rehabilitation and maintenance of existing highways. Primary topics addressed include pavement evaluation for rehabilitation and management, cold in-place recycling techniques for pavement rehabilitation, effectiven
Internationally, significant attention is given to transport sustainability including planning, design, construction, evaluation, safety and durability of the road system. The 4th International Gulf Conference on Roads: Efficient Transportation and Pavement Systems - Characterization, Mechanisms, Simulation, and Modeling, hosted by the University o
This study used over forty-four lane miles of test site to gather up to three years of comparative performance data on thirteen crack sealants. The data indicates that the more durable, high ductility materials when applied in a band-aid configuration can be expected to give significantly better performance than the lower ductility materials used by the Utah DOT prior to 1983. Evaluation of sealant placement procedures indicates that routing is a questionable practice, and that the hot compressed air lance may significantly improve the performance of materials placed during cold or wet conditions. Evaluation of UDOT maintenance activities indicates that sealant melters cannot achieve or maintain the required sealant application temperatures under colder winter conditions. The efficiency of melter units should be improved or not operated under those conditions. More accurate temperature gauges on melter units should be acquired. Inaccurate gauges may cause impaired sealant performance and safety.