This Week's Featured Presentation
Results from Pure Shear Test on UHPFRC
by Evan Bentz, University of Toronto; Frank Vecchio, University of Toronto; Brittany Yap, University of Toronto; and Stephen Foster, University of New South Wales
UHPC and UHPFRC: Innovations in Combining High Tensile Strength and High Ductility (ACI Spring 2019 Convention, Québec City, QC, Canada) HPFRC is a relatively new material that is showing increasing use for practical engineering problems including the webs of some large box girders. While the axial tensile and flexural behavior of this material is now relatively well understood, there is much less information available concerning the shear behavior. This presentation shows the preliminary results of the first large-scale pure shear tests on UHPFRC members. They have a volume of 570 liters, include 2% fibers along with internal conventional reinforcement and are loaded in shear in the Toronto shell element tester. The presentation presents the results of as many tests as we have completed by the time of the ACI conference (more than 4 likely).
July 6 - 12
Tensile Behavior of UHPFRC with Nano-Scale Functionalizing Constituents for Structural Applications in Extremely Aggressive Environments Characterized by Chlorides and Acids
by Liberato Ferrara, Politecnico di Milano
UHPC and UHPFRC: Innovations in Combining High Tensile Strength and High Ductility (ACI Spring 2019 Convention, Québec City, QC, Canada) Current solutions for new concrete constructions in Extremely Aggressive Exposures, as recommended and enforced by design codes, are not considering new cement‐based construction materials, such as Ultra High‐Performance Fiber Reinforced Concrete, neither new constituents specifically conceived to improve the concrete durability, because of the lack of standards and technical awareness by most designers and contractors. The H2020 ReSHEALience project will upgrade to the concept of Ultra High Durability Concrete (UHDC), combining nano‐scale constituents (nano‐cellulose, alumina nanofibers) and self‐healing promoters (crystalline admixtures). The paper will present the approach pursued in the project to design the tensile performance of UHDC mixes as a function of the type and scenario of application, together with a synopsis of the results of ongoing research.