Case Study Illustrating the Benefits of ASTM C 1736

In 2008, a sealant contractor engaged the author to conduct a 100 % evaluation of newly installed joint seals because a pull test report had placed the seal fail­ure rate at 80 %. The agent conducting the evaluation first used a screen roller to identify locations of questionable adhesion for pull testing; however, only the pull test result from each location was reported. The owner’s consultant, refer­encing the evaluation report, recommended “removal and replacement" of all of the installed sealants. However, 100 % evaluation conducted according to the non-destructive rolling device methodology and reporting according to ASTM C 1736 (under ASTM C 24.30 development at the time) revealed a total seal dis­continuity rate of 0.54 % (amounting to 120 unsealed spots in the total joint grid). Thus, the ASTM C 1736 methodology allowed the contractor to imple­ment repairs, save the installation, and deliver a truly sealed joint.