Abstract
Real-time monitoring of structural health is a key issue for structural safety. Monitoring systems have evolved from external devices into intrinsic self-detection systems (SDS) becoming diagnostic and monitoring tools useful to maintain and increase structural durability. Furthermore, SDS are an economical and efficient solution for using human and technical resources towards sustainability. Self-sensing materials are considered a promising SDS technology to replace integrated connected or embedded systems, which have many limitations.
Self-compacting concrete (SCC) is an advanced material that can become a self-sensing concrete by the incorporation of carbon-based materials, which provide the concrete matrix with piezoresistivity properties, transforming the material into a sensor by itself. The advantage of using SCC lies in its larger paste content which allows the use of hybrid systems of carbon-based additions, such as carbon nanofibres (CNF) and carbon fibres (CF). This combination can produce a synergistic response, improving the properties that can be achieved by incorporating each of them separately. Through the integration of electrical and piezoresistive properties, Piezoresistivity-SSC (PSCC) can collect real-time state variation information relating mechanical responses to piezoresistivity.
The aim of this study was to identify the threshold of the effective admixtures content maintaining acceptable workability and achieving PSSC self-sensitivity.
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Acknowledgments
The authors want to thank A. Rodríguez for his technical support. They would also like to thank the companies, some of the components were supplied by Grupo Antolin, BASF Construction Chemicals España S.L., Omya Clariana, Cementos Portland Valderribas.
The authors acknowledge the financial support provided by the projects: CALTH3D (TED2021-132585B-I00), funded by MCIN/AEI/10.13039/501100011033 and the European Union “NextGenera-tionEU”/PRTR; the European Union by the action HORIZON-TMA-MSCA-SE_2021 “BEST-Bio-based Energy-efficient materials and Structures for Tomorrow” (grant number 101086440).
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Puentes, J., Palomar, I., Barluenga, G. (2023). Piezoresistive Self-compacting Concretes (PSSC) with Carbon Fibers (CF) and Nano-fibers (CNF) for Structural Health Monitoring. In: Jędrzejewska, A., Kanavaris, F., Azenha, M., Benboudjema, F., Schlicke, D. (eds) International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures. SynerCrete 2023. RILEM Bookseries, vol 43. Springer, Cham. https://doi.org/10.1007/978-3-031-33211-1_84
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