ABSTRACT
This paper describes a laboratory investigation of the development of an optimal high-performance concrete (HPC) mixture for Tennessee cast-in-place concrete bridge decks. Four modified concrete mixtures were developed by reducing the cementitious content of Tennessee Department of Transportation (TDOT) Class D mix and using a denser graded aggregate combination, while keeping the water-cementitious material ratio constant. Fly ash, slag, and silica fume were used as cementitous replacement materials to evaluate and develop the optimal HPC mix. Various parameters relevant to bridge deck performance were evaluated, including compressive strength, drying shrinkage, freeze-thaw durability, and chloride ion permeability. All four modified mixes exhibited higher compressive strength, lower drying shrinkage, and lower chloride ion permeability than the Class D control mix. Based on performance and potential economic savings, two of the modified mixes that contained fly ash and slag as cement replacements can be recommended as potential replacements for TDOT Class D concrete.
