Abstract
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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