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原文传递 Evaluation of a Field Permeameter as a Longitudinal Joint Quality Indicator. Final rept.

题名：	Evaluation of a Field Permeameter as a Longitudinal Joint Quality Indicator. Final rept.
作者：	Daniel-J.S.; Mallick-R.B.; Mogawer-W.S.
关键词：	Asphalt-pavements; Longitudinal-joint; Premature-distress; Permeameter-; *Evaluation-.;Pavement-projects; Testing-.
摘要：	Premature distress along the longitudinal construction joint in asphalt pavements occurs when adequate density or tightness is not achieved during construction. The objective of this research project was to evaluate a field permeameter as a tool to evaluate the quality of longitudinal joints. As part of the study, a field permeameter that can simultaneously test three locations; along the joint and one foot into both mats, was developed. The permeameter was used to test longitudinal construction joints on pavement projects around New England. Pavements that were tested as part of the study had nominal maximum size aggregate (NMSA) raging from 9.5 mm to 25 mm; base, binder, and surface courses were tested, and various joint construction techniques were used, including infrared heating and various joint sealants. Field cores at most test sites were taken for air void and strength testing in the laboratory and performance of the joints over the course of the project was monitored for several sites. Results of the study show that a permeability or infiltration criterion for longitudinal joint quality is promising. However, more refinements need to be made to the permeameter to reduce the variability in test results. The research team suggests returning to a single standpipe permeameter (air or water) to improve variability. The study also shows that improved construction techniques, such as joint sealants or use of a joint heater, improve the short term performance of the longitudinal joint.
报告类型：	科技报告