Topic: Ultra-High Performance Concrete – Construction Material for Our Future Infrastructure
Ultra-high performance concrete (UHPC) can be seen as one of the major breakthroughs in concrete technology in the last two centuries. The material has attracted the interest of many stakeholders due to its mechanical performance and resistance against environmental degradation. UHPC is defined as a concrete fiber composite with a very low matrix porosity leading to superior mechanical and durability properties compared with conventional concrete. Generally, UHPC uses a water/binder ratio less than 0.2, and attains a compressive strength in excess of 150 MPa. The incorporation of discontinuous fiber reinforcement allows the composite to achieve high ductility and toughness and limit the crack width under service loads. UHPC has been the subject of a number of research efforts as noted from the number of publications in archival journals and conference proceedings. It has been used in various forms in structural and architectural elements, as a bond material, in repair and retrofit applications and as a protective barrier against man-made or natural hazards. UHPC is poised to significantly influence the construction of sustainable and resilient high-performance structures. Enhanced durability, reduced material consumption and reduced maintenance needs promise to have tremendous effects on life cycle costs and may offset the higher material costs in comparison with conventional concrete. The presentation will give an overview of current infrastructure concerns, provide an overview about the composite material properties and will be complemented by the research activities at the Advanced Cementitious Materials and Composites (ACMC) lab at the University of Connecticut.
Dr. Wille received his doctor (Ph.D.) degree in Civil Engineering at the University of Leipzig, Germany in 2008. Financially supported by a post-doctoral scholarship from the German Academic Exchange Service (DAAD), Dr. Wille joined the materials and structural research at the University of Michigan in 2008. At UMICH he continued and emphasized his work on UHPC material development and characterization. In 2010 Dr. Wille accepted a faculty position at the University of Connecticut and established the Advanced Cementitious Materials and Composites (ACMC) Laboratory. His research emphasizes Ultra-high performance concrete: Material Design, Structural Application and Numerical Simulation. Dr. Wille serves in several committees related to his research interest, such as ACI 544: Fiber reinforced concrete and ACI 239: Ultra high performance concrete. In 2015 he received the NSF CAREER award in 2016 he co-chaired the first international interactive symposium on UHPC in Des Moines, Iowa.