Professor Mohsen Issa : Ph.D., P.E., S.E., FACI, Department of Civil and Materials Engineering

1. Performance-Based Aspects and Structural Behavior of High Performance Fibrous Bonded Concrete Overlays Professor MohsenIssa: Ph.D., P.E., S.E., FACI, Department of Civil and Materials Engineering Ph.D. Student: Mohammad Alhassan The Study is Supported by IDOT/Modjeski and Masters, Inc. • Most of the overlay projects have experienced early age delaminations and severe cracking. • Development of high performance, durable, reliable, and cost-efficient overlay is essential to effectively protect bridge decks from corrosion problems and consequent deteriorations. • The stress state at the overlay-deck bond interface and the enhancement in the stiffness of a bridge by the overlay require reasonable analysis and quantification. • Development of high performance, durable bonded concrete overlay for the New Mississippi River Bridge. Investigation of different overlay materials For the New Mississippi River Bridge, the widest cable stayed bridge in the world • Plain and fibrous LMC and MSC overlay mixtures meeting target performance criteria were developed. • The developed LMC with synthetic fibers were selected as overlay system for the New Mississippi River Bridge, the Widest Stay-Cable Bridge in the World. • Guidelines were proposed regarding the magnitudes of live load and shrinkage-induced bond stresses. • Future goals include: • evaluating the performance of LMC and MSC overlays with different types of fibers; and • monitoring the long-term overlay performance.