1. Introduction
Durability of concrete repairs, including all types of repairs and application of different materials, often shows problems [1]. Most of the past efforts focused either on reducing free shrinkage of repair material, increasing its compressive/tensile strength, or increasing bond strength between a repair material and a concrete substrate. However, all these attempts resulted in only marginal improvements as they did not address inherent behavior of concrete as a brittle material [2]. Furthermore, brittleness is even more pronounced in high strength concrete, as it is more prone to cracking. In order to address brittleness as an intrinsic issue of repair systems, Li et al. [3] developed an ultra-ductile fiber reinforced composite called strain hardening cementitious composite (SHCC).