30 Yrs of DEF - An overview


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Concrete is fundamentally a complex material and its properties can change dramatically when exposed to high temperatures. The mechanism of DEF in concrete is complex and a number of comprehensive reviews on the DEF phenomenon have been recently published. However, controlling the maximum concrete temperature is often used as the criteria for concrete acceptance or rejection.

This webinar will discuss the basics of DEF, the mechanism of deterioration and the properties of cementing materials and concrete that are known to minimize the risk of premature durability failure of the precast concrete elements.


  • Tempreture limits
  • Characteristics of cement that expands
  • Reserch
  • Risk factors

Presenter: Dr David McDonald 

DAvid-McDonald.jpgSince 1986 Dr. McDonald has been solving problems in construction with a focus on construction materials.  After graduating with his Ph.D. in 1990 from the Civil Engineering Department of the University of Sydney he spent a large portion of his career in Chicago, initially working with a consulting engineering organization working principally in durability and corrosion.  He worked on several structural collapses and large research projects on corrosion for the Federal Highway Administration.

David spent 10 years working on construction product development, gaining 8 US Patents for materials and processes and being awarded a Chicago Innovation Award.  During this period, he evaluated the future of construction and developing businesses for new systems.  He later spent time with the Concrete Reinforcing Steel Institute before returning to Australia in 2017. 
David is currently with BG&E in Sydney working on materials issues including construction defects, design of large concrete projects and renovation of existing concrete structures.

Total viewing time - 14 min

Learning Module Standard Inclusions
By purchasing this Online Learning Module, you will have the opportunity to view recorded presentations (video and audio) at your own pace over a 90-day period.