RE-CAST UTC, US DOT, Missouri DOT
Admixtures, Corrosion resistance, Cracking, Durability, Fiber reinforced concrete, Optimization, Rheology, Shrinkage, Synthetic fibers, Tensile strength
The main objectives of this project can be summarized as follows: (1) Optimize the SRA-fiber system of SCC and SWC mixtures to achieve superior performance, including properties, autogenous shrinkage, restrained shrinkage, mechanical properties (tensile and compressive strength), frost durability, and transport properties. The investigation will include the Eclipse 4500 SRA, or equivalent, and two types of synthetic fibers (i.e., STRUX and SINTA from GCP). (2) Evaluate the effect of rheological properties of fiber alignment along the casting-flow direction of structural elements. The rheological properties of concrete will be modified using a viscosity modified admixture (VMA), such as V-MAR from GCP. The incorporation of VMA can improve the stability of the concrete mixture and distribution of the fibers. (3) Investigate the corrosion resistance of reinforcing bars in pre-cracked FR-SCC and FR-SWC mixtures. The cracking will be controlled to achieve different widths for mixtures with different fibers. The transport properties of the concrete matrix will also be investigated. (4) Evaluate the enhancement in tensile/flexural toughness and shrinkage/crack resistance of FRC made with partially replacement of the steel reinforcement in flexural members with different types of and combinations of the STRUX and SINTA fibers.