A barge hit the Webbers Falls, Okla., bridge May 26, felling four spans (ENR 6/3 p. 11). The state hired Gilbert Central Corp., a Ft. Worth, Tex.-based unit of Peter Kiewit Sons Inc., to replace spans, piers and caps.
Gilbert used Stillwater, Okla.-based Nomadics Construction Labs' intelliRock logger, a 35mm film canister-sized sensor containing battery, microprocessor, and temperature sensor, to measure, calculate and record concrete maturity continuously. Each logger measures a structure's time-temperature history for up to two months.