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Advancing Concrete Durability, A Special Session Honoring Michael Thomas, Part 1 of 2
Monday, October 18, 2021 10:00 AM - 12:00 PM
This session will honor Michael Thomas, PhD, PEng, FACI, FICT, for his extensive contributions to advancing cement and concrete research, and his service to the concrete industry. Various industry leaders will discuss the impacts of the research conducted by Dr. Thomas and his students in the areas of supplementary cementitious materials (SCMs), alkali-silica reaction (ASR) mechanisms, mitigation, and testing; sulfate resistance; chloride-induced corrosion; and other areas of concrete durability.
(1) Explain the role of exposure sites for studying alkali-silica reaction (ASR);
(2) Illustrate how supplementary cementitious materials (SCMs) mitigate ASR?;
(3) Describe how chloride ingress-based service-life models work;
(4) Summarize how service life modeling can be applied to real-world situations.
This session has been approved by AIA and ICC for 2 PDHs (0.2 CEUs). Please note: You must attend the live session for the entire duration to receive credit. On-demand sessions do not qualify for PDH/CEU credit.
Life-365: Stories and Choices About Development
Presented By: Evan Bentz
Affiliation: University of Toronto
Description: At a workshop at NIST in 1998 that I attended with Mike Thomas it became clear that there would be value to a vendor-independent service life model that could be used by practicing engineers to help them make service life design decisions and to document their designs. I was tasked with writing the original computer program Life-365 and suggested the name. Now, almost 25 years later, the program continues to be of interest so the profession and has hopefully helped practicing engineers do their jobs. The presentation will present some of the stories from and things learned from this project and where it could go next.
Relating ASR Lab Tests to Outdoor Exposure Site Performance - More Research is Needed
Presented By: Benoit Fournier
Affiliation: Laval University
Description: Concrete is a very widely used and highly versatile construction material; however, it is often exposed to very harsh conditions that have shown to affect its performance. In the case of alkali-silica reaction, many laboratory test procedures have been developed since the 1940’s aiming at forecasting the field performance of various types of reactive aggregates and the effectiveness of preventive measures for concrete, notably supplementary cementitious materials and lithium-based admixtures. These tests use accelerated conditions in the laboratory that sometimes have shown limited correlation with the expected field performance of the material’s combinations tested.
Outdoor exposure site testing has been used over the past few decades in order to better understand/forecast the long-term field performance of alkali-silica reactive aggregates under various environmental conditions and to optimise the tools that engineers can use in the laboratory to predict this long-term behaviour in reasonable time periods. This presentation gives a summary of some of those investigations conducted over the past few decades aiming at preventing the deleterious effects of reactive aggregates in concrete around the world. Thoughts on future research needs and directions will be provided.
Understanding How Supplementary Cementitious Materials Suppress ASR
Presented By: Karen Scrivener
Affiliation: Ecole Polytechnique Fdrale De Lausanne
Description: My first contact with Mike was in the early 80s when he was hired via Imperial College to work on use of fly ash in Concrete at BRE. We also did at the time a bit of work to look at the impact of fly ash on ASR. When I moved to Switzerland in 2001 we took up research on ASR again as this is a major issue confronting Dams in Switzerland. In the thesis of Chappex we looked at SCMs containing alumina as well as silica and found that alumina in solution could directly suppress the dissolution of silicate minerals. More recently, through a large collaborative project in Switzerland we have had the opportunity to look at the impact of alumina in more detail. This work highlights the mechanisms by which SCMs suppress ASR.
Contributions of M. D. A. Thomas to PCA Research
Presented By: Michelle Wilson
Affiliation: Portland Cement Association
Description: For over 25 years, Michael Thomas has been involved with PCA research and education involving concrete durability. Topics have included Use of SCMs, DEF, Sulfate Resistance, Marine Exposures, ASR, and Portland Limestone Cements. This session will highlight some of his more notable works that have greatly influenced the development of cement and concrete technology.