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Re: Flyash

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Eric and others,
I'm looking into the relative benefits of High-Performance Concrete, as discussed in Edward G. Nawy's "Fundamentals of High Performance Concrete" vs other means, such as those proposed by Professor P. K. Mehta for very-long-serviceability concrete for historic preservation projects.  They are at odds.
Professor Mehta co-authored an article in Concrete International, March 2001, in which high-early-strength, high-cement-content concrete was reported to lead to poor performance in meeting long-term-durability goals.  The article discussed issues and called for a "major paradigm shift" in materials, proportioning and construction practice, but gave little hard guidance.  Is more information available on his approach to achieving long-term durability?
Nels Roselund
Structural Engineer
South San Gabriel, CA