1. Low concrete release strengths can lead to initial concrete degradations during prestress transfer in production, for prestressing wires with certain surface geometries and the seven-wire strand; 2. Subjected to dynamic loading cycles, initial concrete degradations can develop into macroscopic bursting/splitting cracks; 3. The presence of fastener shoulders does not change the concrete degradation patterns (for the wires) or the likelihood of splitting failure (for the seven-wire strand) at the 3,500 psi concrete strength level; 4. The elastoplastic bond model is key to differentiating the interface bond-slip and dilatational effects and predicting the splitting/bursting failures.
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