This study provides an extensive database and a summary of a comprehensive experimental investigation on the fresh state and mechanical properties of high early strength fiber reinforced concrete (HESFRC). The control high early strength (HES) concrete used for fiber addition and the resulting HESFRC are defined as achieving a target minimum comprehensive strength of 5 ksi (35 MPa) in 24 hours, as measured from 4x8-in. (100 x 200-mm) cylinders. Fresh HESFRC properties tested included air content, workability (by the inverted slump test), temperature, and plastic unit weight. Tests on the mechanical properties include compressive stength, elastic modulus, flexural stength, splitting tensile strength, and fatigue life. Sixteen different combinations of parameters were investigated; the variables were the volume fraction of fibers (1% and 2%), the type of fiber (steelm polypropylene), the fiber length or aspect ratio, and the addition of latex of silica fume to the mix. Optimal mixes that satisfied the minimum comprehensive strength criterion, and showed excellent values of modulus of rupture, toughness indices in bending, and fatigue life in the cracked state, are identified. Potential applications in construction, repair, and rehabilitation of transportatin strucutures are suggested.
Abstract