- This event has passed.
Decryption of Concrete Durability Deterioration Mechanisms Using Concrete Petrography and Image Analysis
February 24, 2023 @ 9:00 am - 10:00 am
Presentation
Decryption of Concrete Durability Deterioration Mechanisms Using Concrete Petrography and Image Analysis
While good workability and mechanical performance are critical for the construction of transportation infrastructure, the stakeholders also seek durable concrete that can last a desired service life without significant deterioration. Concrete durability comes in different forms of complex processes that commonly involve interactions between external substances (e.g., water, chloride, sulfate, etc.) and internal material properties (e.g., aggregate types, air-void system, paste components and microstructure). For instance, the ingress of chloride-based deicers can deteriorate concrete and facilitate steel reinforcement corrosion, and the absorbed water in concrete can cause freeze-thaw damage in cold regions. Concrete petrography, combined with image analysis and other techniques, provides a powerful tool to diagnose durability related concrete deteriorations. This presentation will provide a discussion of different projects that use concrete petrography and image analysis to investigate durability mechanisms.
Speaker
Chunyu Qiao, PhD, Senior Associate
Wiss, Janney, Elstner Associates
Dr. Chunyu Qiao is a Senior Associate and Petrographer at Wiss, Janney, Elstner Associates. He is an associate member of ACI Committees 201 (Concrete Durability) and 365 (Service Life Prediction). He is a junior editorial board member for Journal of Infrastructure Preservation and Resilience. Dr. Qiao received his PhD from University of Science and Technology Beijing, China. He was a visiting scholar at Purdue University from 2013 to 2015 and a postdoctoral researcher at Oregon State University from 2016 to 2018. His research interests include microscopy of cementitious materials, transport properties of cementitious materials, chemical admixtures, and concrete durability.