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02827aam a2200385Ic 4500 001 F9FB1552B7CA11EC864CB83724ECA4DB 003 SILO 005 20220409010100 007 cr b|||||||||| 008 160812s1988 iaua s000 0 eng d 035 $a (OCoLC)956532811 040 $a UIG $b eng $e rda $c UIG $d UIG $d SILO 088 $a HR-537 245 00 $a Evaluation of bond retainage in portland cement concrete overlays by infrared thermography and ground penetrating radar / $c [Donahue & Associates, Inc.] for the Iowa Department of Transportation. 260 $a Waterloo, Iowa : $b Donohue & Associates $c 1988. 300 $a 1 online resource (various pagings) : $b illustrations 500 $a "Project no. 50389." 520 3 $a The purpose of this project was to evaluate the location and quantities of debonding in selected portland cement concrete (PCC) overlays. The project entailed an infrared thermographic survey and a ground penetrating radar survey of the PCC overlays to locate areas of debonding between the overlays and the original pavement. An infrared scanner is capable of locating these areas because of the temperature differential which is established between bonded and debonded areas under certain environmental conditions. A conventional video inspection of the top surface of the pavement was also completed in conjunction with the infrared thermographic survey to record the visual condition of the pavement surface. The ground penetrating radar system is capable of locating areas of debonding by detecting return wave forms generated by changes in the dielectric properties at the PCC overlay original pavement interface. This report consists of two parts; a text and a set of plan sheets. The text summarizes the procedures, analyses and conclusions of the investigation. The plan sheets locate specific areas of debonding, as identified through field observations. 650 0 $a Pavements $x Testing. $x Testing. 650 0 $a Pavements, Concrete $x Thermographic methods. $x Thermographic methods. 650 0 $a Pavements $x Testing. $x Testing. 650 7 $a Pavements, Concrete $x Thermographic methods. $x Thermographic methods. $2 fast $0 (OCoLC)fst01055577 650 7 $a Pavements $x Testing. $x Testing. $2 fast $0 (OCoLC)fst01055336 650 7 $a Pavements $x Testing. $x Testing. $2 fast $0 (OCoLC)fst01055407 650 07 $a Concrete overlays. $2 trt 650 07 $a Deterioration. $2 trt 650 07 $a Overlays (Pavements). $2 trt 650 07 $a Rehabilitation (Maintenance). $2 trt 710 2 $a Donohue & Associates. 710 1 $a Iowa. $b Department of Transportation. 856 40 $a Iowa Publications Online $u http://publications.iowa.gov/id/eprint/22504 941 $a 1 952 $l IAOX771 $d 20240710103224.0 956 $a http://locator.silo.lib.ia.us/search.cgi?index_0=id&term_0=F9FB1552B7CA11EC864CB83724ECA4DB 994 $a C0 $b UIGInitiate Another SILO Locator Search