United States Department of Transportation
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Investigation of Bonding Materials for Piezoelectric Traffic Monitoring Equipment
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1994-11-01
[PDF-4.63 MB]
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Edition:Interim
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Abstract:Proper highway design requires the use of accurate traffic data. Such data are collected by traffic monitoring equipment installed in the road surface. This equipment usually consists of piezoelectric sensors, either 1.8 meters or 3.6 meters long (6 or 12 feet long), installed in a groove cut into the pavement, and held in place by a bonding agent. This study was undertaken at the request of the Texas Department of Transportation (TxDOT), in an effort to find bonding agents applicable to this use. Preliminary research consisted of a literature search, DOT survey, and manufacturers' survey to determine the current practice. Materials were selected and screened with some basic laboratory tests to determine their basic physical and material properties. Compatibility tests were conducted to determine the bond characteristics. Field tests were also conducted to determine the installation parameters of the materials. Finally, the test results were analyzed to determine which materials would perform satisfactorily in actual use. Recommendations are made, listing the most promising materials and the selection criteria to be used in future evaluations.
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