MIT CSHub Webinar: The Role of Air Entrainment in Freeze-Thaw and Corrosion Based Service Life Models for Performance
Thursday, July 19, 2018 at 11:00am to 12:00pm
Freeze-thaw damage is a potentially serious deterioration process that occurs in concrete structures in cold climates. Air-entrainment, the intentional creation of tiny air bubbles in the material, is used to improve freeze-thaw performance. In this presentation, the role of air entrainment will be discussed based on a degree of saturation concept as it relates to the use of transport properties for 1) predicting the time to saturation for freeze thaw damage and 2) predicting the time to corrosion for concrete exposed to deicing salts. The mixture proportions will be used with theory to calculate theoretical porosity, which is compared to experimental measurements. The concepts behind the model will be discussed along with methods to measure the modeling inputs in the field. The approach used is consistent with the new AASHTO PP-84-17 approach being considered by many states.
This webinar will be presented by CSHub collaborator Dr. Jason Weiss, the Miles Lowell and Margaret Watt Edwards Distinguished Chair in Engineering and the Director of the Kiewit Center for Infrastructure and Transportation Research at Oregon State University.
The MIT Concrete Sustainability Hub (CSHub) webinar series offers information of general interest to members of the building, paving, and construction communities, as well as to educators, students, journalists, and law and policy-makers interested in the environmental and economic impacts of decision-making concerning infrastructure. Videos of past webinars are archived to the CSHub YouTube Channel.
Webinars are free and open to the public. Presentations are geared toward a lay audience.