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03193cam a2200397Ia 4500 001 0DBFC8A82B0C11DE82774608A8D7520A 005 20190910012519 008 060316s2006 vaua bt s000 0 eng d 035 $a (OCoLC)64704750 040 $a TDG $c TDG $d SILO $d UIG $d SILO 100 1 $a Sharp, Stephen R. 245 1 $a Nondestructive evaluation of epoxy-coated reinforcing bars in concrete using bi-electrode half-cell potential techniques / $c Stephen R. Sharp. 260 $a Charlottesville, Va. : $b Virginia Transportation Research Council, $c 2006. 300 $a iii, 19 p. : $b ill. ; $c 28 cm. 490 1 $a VTRC ; $v 06-R24 500 $a "March 2006." 504 $a Includes bibliographical references (p. 18-19). 513 $a Final report. 520 3 $a This study evaluated two half-cell mapping methods for nondestructive evaluation of epoxy-coated rebar (ECR) in concrete: the semi-fixed bi-electrode and the moving bi-electrode methods. These methods were expected to provide early detection of corrosion-related damage and ensure adequate time for repair. The techniques were evaluated by comparing the half-cell measurements using the two half-cell mapping techniques and measurements using the standard half-cell technique. The study found that in concrete specimens the response of both bi-electrode techniques was similar to that of the standard half-cell technique. Each technique was sensitive enough to distinguish between ponded and unponded regions along the Type I test beams. Although additional research is required to determine exactly how sensitive either bi-electrode technique is for assessing corrosion of ECR in concrete, it is clear that the use of any nondestructive tool for condition surveys of bridge decks would benefit VDOT and Virginia. The author recommends that the Type I test beams used in this study continue to be ponded until corrosion is initiated to aid in understanding the benefit of using the two bi-electrode methods during the various stages of corrosion. In addition, the Virginia Department of Transportation's Structure & Bridge Division should identify two structures that are beginning to show signs of corrosion, one bridge with ECR and the other with bare bar, to be used in a field study to determine if either bi-electrode method would benefit VDOT as a condition survey tool. 530 $a Also available online via the VTRC website. 536 $a Sponsored by Virginia Department of Transportation and U.S. Federal Highway Administration $b 68758 650 0 $a Nondestructive testing. 650 0 $a Reinforcing bars $x Testing. 650 0 $a Epoxy coatings $x Testing. 650 7 $a Corrosion tests. $2 trt 650 7 $a Nondestructive tests. $2 trt 710 2 $a Virginia Transportation Research Council. 710 1 $a Virginia $b Dept. of Transportation. 710 1 $a United States. $b Federal Highway Administration. 830 0 $a VTRC (Series) ; $v 06-R24. 856 41 $u http://www.virginiadot.org/vtrc/main/online%5Freports/pdf/06-r24.pdf 939 $a 5605347 941 $a 1 956 $a http://locator.silo.lib.ia.us/search.cgi?index_0=id&term_0=0DBFC8A82B0C11DE82774608A8D7520A 994 $a 02 $b UIG 952 $l Z7OX851 $d 20090701080000.0Initiate Another SILO Locator Search