Concrete Mix Design, Quality Control and Specification

Ken W. Day has, in his long career, held positions as a university lecturer and a structural designer, and in production, R&D, and management in the precast and ready mixed concrete industries. He ran his own consultancy for thirty years.

James Aldred is Technical Director at AECOM, one of the world's largest engineering firms. He was the Independent Verifier for the Burj Khalifa in Dubai.

Barry Hudson is Director of Competency Center Materials at Heidelberg Cement in charge of concrete and aggregates operations for several major ready mix organisations in several countries.