One small correction to your article, “Erlin & Hime on Concrete,” p. 32 in the June 2005 issue of CONCRETE CONSTRUCTION. ASTM C 31 specifies 73° F for Standard Final Curing and not 70° F as implied in your article. After all, curing temperatures also affect strength!

I love to read your articles.

— Henry G. Russell, Structural Engineer and Former President of CTL, Glenview, Ill.