Materials Performance

NOV 2014

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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15 NACE INTERNATIONAL: VOL. 53, NO. 11 MATERIALS PERFORMANCE NOVEMBER 2014 Information on corrosion control and prevention signs on the surface. In addition to GPR, which helps to determine delaminated areas, the bridge deck assessment tool also utilizes IE, which generates sound waves that propagate through the con- crete and ref lect back from internal f laws in the concrete so the location and the scope of internal damage can be deter- mined. Changes in the quality of the con- crete deck are also identif ied by USW, which uses ultrasonic wave ref lections to detect and locate discontinuities in the concrete. Using the tool to assess bridge deck conditions reduces the hazards for inspectors and motorists that are associ- ated with road work zones. The bridge deck assessment tool is preprogrammed through its GPS to inspect a particular area, which eliminates the need to dis- rupt traff ic for personnel to manually mark test grids. An operator can control the bridge deck assessment tool remotely using a smartphone or an iPad. † Four omnidirectional wheels enable it to move smoothly along the roadway and an inter- nal laser scanning system keeps it from colliding with barriers, curbs, vehicles, and people. The van that transports the tool to various testing sites also doubles as a mobile command center, where data transmitted wirelessly from the tool are collected, processed, and displayed. Four main displays inside the van—collected data and images, data analysis, real-time deck condition data, and crack map- ping—enable inspectors and engineers to simultaneously analyze the different ty pes of information on the condition of the bridge deck. The combination of these condition assessments from data col- lected is expected to help bridge manag- ers and engineers easily identif y any bridge deck conditions that need to be addressed, as well as improve under- standing of the performance and service life of concrete decks on specif ic ty pes of bridges. Additionally, quantitative infor- mation on concrete deck performance may lead to policies and procedures that foster data-driven decisions that improve eff iciency, speed, and cost-effectiveness of maintenance and rehabilitation processes. The bridge deck assessment tool made its debut in November 2012 on a Virginia bridge that is part of the LTBP study. Fol- lowing that, the FHWA tasked the devel- opment team with validating previously collected data on several other LTBP bridges along the East Coast, including the iconic Arlington Memorial Bridge between Washington, DC and Virginia, using the bridge deck assessment tool. The team is currently testing the tool on several bridges in the mid-Atlantic states, and demonstrated it on the Ewing Mill Road/Hassam Road Bridge near Pittsburgh in June 2014 for the Pennsylva- nia Department of Transportation (PennDOT). The bridge deck assessment tool navigated the structure twice and collected data on one full lane of the two- lane concrete bridge deck in ~45 min. According to PennDOT, the assessment would have taken eight times longer using conventional methods. Sources: U.S. Department of Transporta- tion Federal Highway Administration, Long-Term Bridge Performance program, www.fhwa.dot.gov; and Rutgers University Center for Advanced Infrastructure and Transportation, cait.rutgers.edu.

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