日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 659-662

Development of Prestressed Concrete Using Fe-Mn-Si-Based Shape Memory Alloys Containing NbC

Takahiro Sawaguchi1, Takehiko Kikuchi1, Kazuyuki Ogawa1, Setsuo Kajiwara1, Yosaku Ikeo2, Masarou Kojima2 and Takatoshi Ogawa2

1National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047
2Takenaka Corporation, 1-5-1, Otsuka, Inzai, Chiba 270-1395

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.


(Received 2005/2/22)

Keywords:

prestressed concrete, shapememory alloy, iron-manganese-silicon-based alloy, niobium carbide, high cracking stress, smart composite


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