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Crack sealing and filling are two of the main traditional techniques of asphalt pavement preventive maintenance. However, these techniques have the shortcomings of low operating efficiency and poor performance such as secondary cracking and edge failure. In this paper, the investigation results of field performance of crack seal band are presented. The seal band is a promising material of crack repair because it results in fewer secondary cracks and greater operating efficiency (two to four times more efficient than crack sealing). However, the field investigation also revealed four major failure modes of seal band, namely, unevenness, cohesion failure, adhesion failure, and pullout that provide the demand to carry out laboratory studies on the properties of seal band material. The following standards are referenced in the studies: (1) standard of hot-applied sealant, (2) standard of building waterproof roll, and (3) standards of related enterprises. Six evaluating test methods are put forward based on the laboratory studies, including: thickness meterage, width meterage, cone penetration test, softening point test, pullout test, and bond test. Fifteen seal band samples are tested in a laboratory evaluation. Based on the field investigation and test results, the technical requirements of different seal bands used in different areas are proposed.
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.
"The objective of the NTPEP is to combine and focus the resources of the participating NTPEP member departments in the evaluation of materials of common interest in order to improve cost effectiveness. This report provides the NTPEP member departments the necessary information to evaluate HMA crack sealers without the investment of their time and manpower for testing ... This report contains the laboratory test results and some comments on the installation of the sealants, along with the data accumulated during the 2006 and 2008 performance evaluations, for the NTPEP Test Facility's study of HMA Crack Sealants submitted in 2005"--Page 2
"The objective of the NTPEP is to combine and focus the resources of the participating NTPEP member departments in the evaluation of materials of common interest in order to improve cost effectiveness. This report provides the NTPEP member departments the necessary information to evaluate HMA crack sealers without the investment of their time and manpower for testing ... This report contains the laboratory test results and some comments on the installation of the sealants, along with the data accumulated during the 2006 and 2008 performance evaluations, for the NTPEP Test Facility's study of HMA Crack Sealants submitted in 2005"--P. 2.