Towards the development of damage tolerant engineered cementitious composites with super-elastic reinforcement

Author(s): Dario Mirza, Eduardo Pereira, João Almeida, Vitor Cunha
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 796-803
Total Pages: 848
Language: English

Abstract: Certain types of dynamic or extreme loading, such as seismic loading, are extremely damaging to structures in general, and in particular to reinforced concrete. In this regard, great efforts have been dedicated to the development of engineering solutions that lead to increased safety of structures in seismic scenarios and under extreme loading cases. The main goal is to increase the capacity of the structures to deform and to accommodate damage without excessive degradation of their integrity or stability.
Recently, the application of shape memory alloys (SMA), either as reinforcement or at certain parts of the structure, has been studied as a means to reach the aforementioned goal. Additionally, Engineered Cementitious Composites (ECC), due to their ability to develop multiple cracks in tension at steadily increasing tensile stresses and the very high ultimate tensile strains that they typically reach, seem to present the ideal characteristics to accommodate the level of damage that is expected in these cases without suffering critical degradation of integrity. Therefore, in the present work the combination of ECC with SMA in a composite system was studied. Considering that the most critical aspect of such composite should reside at the level of the interface between both materials, two types of arrangement of the reinforcement have been studied, in order to assess the importance of the interfacial properties.
The results showed that there is great potential in the ECC-SMA composite systems. However, the adhesion of the SMA to the ECC matrix is low. In order to fully explore the potential of both materials, the interface properties of the typically smooth SMA should be redesigned in order to increase the adhesion between both materials and enhance the composite effect.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00