Richard D. Gaynor, a prominent researcher in the concrete industry since the 1950s and a former executive vice president of the National Ready Mixed Concrete Association, died in Maryland on July 16. He was 83.
NRMCA said that Gaynor's wide-ranging achievements included work in developing standards for cement; strength and durability testing; reuse of returned concrete and wash water; characteristics of aggregates; mixing in truck mixers; and initiatives to improve ready-mix-concrete quality.