This article reports the mechanical properties of the concrete prestressed by the Fe Mn Si based shape memory alloys containing NbC that exhibit an excellent shape memory effect without so called the``training'' treatment. A thermomechanically treated Fe 28Mn 6Si 5Cr 0.53Nb 0.06C(mass) alloy was used for this purpose. Four rectangular shaped specimens were embedded in mortar, and heated at above their reverse martensitic transformation start emperature after hardening of the mortar matrix. Three point bending tests were performed for the mechanical property characterization. It was found that prestressing by the shape memory alloys increased the bending stress and cracking stress of mortar.
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