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Webinar with Invited Speaker Jason Weiss
July 9, 2020 @ 11:00 am - 12:00 pm
Documentation of Bridge Deck Construction Using Industrially Produced Internally Cured, High Performance Concrete
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The Indiana Department of Transportation (INDOT) commissioned the construction of bridge decks using an internally cured concrete designed to achieve an increase in durability through reductions in ionic transport and potential for cracking. In an effort to improve the durability, a blended cementitious system containing ordinary portland cement, fly ash or slag, and silica fume was specified for use at moderate water-to-cementitious materials ratios, of less than 0.43. Since higher performance concretes show an increased susceptibility for shrinkage cracking, the process of internal curing using a pre-wetted fine lightweight aggregate was used to reduce the potential for cracking. This presentation presents a case study on the construction of these internally cured, high performance concrete bridge decks with a focus on its impact of implementation on practice. Basic testing results such as strength and stiffness will be presented with a focus on the lack of necessity for revisions to code equations or design practices due to the presence of internal curing. In addition, a new quality control technique for the rapid determination of lightweight aggregate moisture states will be reviewed while recommendations for the daily field implementation of internally cured concrete will also be presented. This research is intended to provide a succinct overview of the successful field implementation of internally cured concrete, which offers the potential to produce concrete that may have a lower susceptibility to cracking, leading to realized improvements in the service life of high performance concretes.
About the Speaker:
Jason Weiss is the Edwards Distinguished Chair in Engineering and the Director of the Kiewit Center for Infrastructure and Transportation Research. Before joining Oregon State as the Head of the School of Civil and Construction Engineering he was a faculty member at Purdue University for over 16 years where he held the position of the Jack and Kay Hockema Professor of Civil Engineering and Director of the Pankow Materials Laboratory. He earned a B.A.E. from the Pennsylvania State University and a MS and PhD from Northwestern University in 1997 and 1999 respectively. He is actively involved in research on cement and concrete materials specifically focused on early age property development, cracking, transport in concrete, and concrete durability. Specifically, he is known for research his group has performed in the areas of shrinkage and cracking reduction, the use of the ring and dual ring test, use of electrical resistivity and the formation factor, use of internally cured concrete, and concrete pavement durability.
Dr. Weiss has taught courses in civil engineering materials, concrete materials, service life, repair and non-destructive testing. His primary research interests are in the area of early age shrinkage cracking and mitigation as well as service life sensing and prediction.
He is also a primary author of the durability tests for the Performance Engineered Mixtures/Performance Related Specifications programs underway at FHWA. He is currently the Editor-in-Chief of the American Concrete Institute’s Journal of Materials, Associate Editor of the Transportation Research Record, and is the former editor in chief of the ASTM journal of Advances in Civil Engineering Materials and the RILEM journal Materials and Structures.
Dr. Weiss has authored over 425 publications with over 225 peer-reviewed journal articles. He is recipient of the NSF Career Award, the RILEM L’Hermite Medal, the ACI W. P. Moore, ACI Young Member, ACI Philleo, and ACI Wason Awards, the ESCSI Erskine Award, the TRB Burgraff, AFN040 section award, and Mather Awards for outstanding research and publications, the ACPA Knutson award, and the ASCE Huber Award. He is a fellow of ACI and is also the recipient of the Wansik, Munson, Buck, and Burke award for outstanding teaching/advising in the School of Engineering, the Potter award for outstanding teaching in the College of Engineering, the University Murphy Award for undergraduate teaching, and has been inducted into the Purdue Teaching Academy.
Education
- Ph.D. Northwestern University 1999
- M.S. Northwestern University 1997
- B.A.E. Penn State University 1995
Research Interests
- Behavior of Cement and Concrete at Early-Ages
- Early Age Shrinkage and Cracking
- Shrinkage Reducing Admixtures and Internal Curing
- Durability of Reinforced Concrete Structures
- Fracture Mechanics and Damage Localization
- Non-Destructive Testing and In Situ Sensing
- Freeze-Thaw Performance and Deicing Salt Degradation
- Service Life Modeling and Simulation