Q.: We are interested in the possibility of using high strength concrete in pavements and bridge decks to improve durability. Has anybody achieved 10,000-psi concrete with an air content of 8 percent? If not, is it possible that it can be done?

A.: We don't know of anyone who has achieved air contents of 6 or 8 percent in concretes having strengths around 10,000 psi. Several people knowledgeable about high strength concrete feel that the strength of 10,000-psi concrete would suffer drastically at such air contents. Most high strength concrete used to date has been in applications where entrained air has not been needed for resistance to freezing and thawing and deicers.