题 目： Nondestructive Evaluation of Concrete Bridge Decks using Automated Acoustic Scanning System and
Ground Penetrating Radar
报告人： Prof. Jinying Zhu，University of Nebraska Lincoln.
时 间： 2018年7月4日（周三）10：00
地 点： 深部岩土力学与地下工程国家重点实验室305报告厅
报告人简介：Dr. Jinying Zhu is an associate professor in Department of Civil Engineering at the University of Nebraska Lincoln. She received her Ph.D. degree in civil Engineering from the University of Illinois at Urbana-Champaign in 2006. Her research interests include NDT for concrete, wave propagation, innovative sensing techniques, and NDT data fusion. Dr. Zhu is a recipient of the ASNT Fellowship Award in 2012, and three times winner of ACI-James Instruments Award. Dr. Zhu’s research projects have been sponsored by many US federal and state agencies and industrial sponsors, including National Institute of Standards and Technology (NIST), Department of Energy (DOE),Department of Transportation (DOT), Department of Defense (DOD-NAVY), National Science Foundation (NSF), and ASNT.She is an associate editor of Journal of Nondestructive Evaluation.
报告摘要：Delamination and reinforcement corrosion are two major deterioration problems for reinforced concrete (RC) bridge decks. Chain drag testing is a common practice for bridge deck evaluation owing to its low cost and ease of use. However, this method is subjective, and result interpretation depends on the experience of the operators. Traffic noise affects the test speed and accuracy of results.We proposed and developed an automated acoustic scanning system to detect delaminations in concrete structures, including bridge decks. The system consists of an array of ball-chain impactors, a noncontact MEMS microphone sensor array, multi-channel data acquisition device, RTK GPS positioning system, and signal processing schemes. The system enables rapid evaluation of bridge decks and delamination images will be generated immediately after scanning.
Ground Penetration RADAR (GPR) is able to penetrate large depth in concrete and can be used to evaluate rebar corrosion and concrete deterioration in bridge decks, even on decks with asphalt overlays. Acoustic and GPR scans provide complementary information about bridge deck conditions. Combination of these two methods will provide more efficient and comprehensive in-situ evaluation of reinforced concrete bridge decks than a single NDT method can offer.