e-ISSN 2231-8542
ISSN 1511-3701

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Microstructure and Mechanical Properties of Hybrid Super ElasticNiTi Alloy with Steel Rebar for Reinforced Concrete Beam

Nubailah Abd. Hamid, Muhammad Akmal Ahmad Shazalli, Muhammad Hussain Ismail and Azmi Ibrahim

Pertanika Journal of Tropical Agricultural Science, Volume 25, Issue S, July 2017

Keywords: Hybrid NiTi, shape memory alloy, shape memory effect (SME), superelasticity (SE)

Published on: 28 Feb 2018

NiTi is well known for its shape memory effect and super elasticity (SE), and is widely used in medical, dentistry and aerospace applications. For shape memory, NiTi has the ability to undergo deformation at certain temperature then recover to its original shape while SE occurs at narrow temperature range just above its transformation temperature. It shows that this material remembers its original shape and is elastic under stress. The application of nitinol as partial replacement in reinforced concrete beam for seismic resistant structures is popular due to it re-centring capability and distinctive properties. Using Shape Memory Alloy (SMA) in structures has its downsides. Hence, hybrid reinforced concrete beam with SMA was introduced to improve the structure's ductility and energy dissipation. Hence, this research is aimed at distinguishing microstructure and mechanical properties of SMA and steel rebar. Not much is known about how SMA behaves when subjected to compression. Therefore, X-Ray Diffraction (XRD) was used to analyse if any secondary phase exists and Differential Scanning Calorimetry (DSC) test was used to analyse the phase transformation. The results showed hybrid NiTi-steel rebar can address some deficiencies of NiTi and in terms of costs. On the other hand, combining them will result in super elastic recovery, displacement ductility and strength capacity for seismic resistant design.

ISSN 1511-3701

e-ISSN 2231-8542

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