Self-consolidating concrete for box culverts in South Dakota using local aggregates

South Dakota State University (SDSU) and the South Dakota Department of Transportation (SDDOT) have begun research into the feasibility and performance of self-consolidating concrete (SCC) for SDDOT projects. The objective of this research was to develop and test SCC mix designs making use of South Dakota local aggregates. Twelve mix designs were studied. Mixes were developed for eastern and western South Dakota local aggregates. For each aggregate designation, mixes for precast and cast-in-place SCC were tested. For each aggregate designation mixes for precast and cast-in-place SCC were tested. The water/cement ratios were 0.38, 0.42, and 0.46 for the mixes tested.; All SCC mixes were stable in the laboratory conditions by visual stability index and hardened visual stability index. As w/c ratio increased, the SCC flowability (slump) typically increased. As w/c ratio increased, blocking typically decreased. As w/c ratio increased, SCC compressive strength decreased at 7 days and 28 days, splitting tensile strength decreased and modulus of rupture decreased. Special Provisions were developed with the SDDOT and members of the industry.