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Carbon Nanofiber Cement Sensors to Detect Strain and Damage of Concrete Specimens Under Compression

Department of Civil Engineering, University of Alicante, 03690 San Vicente del Raspeig, Spain
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Nanomaterials 2017, 7(12), 413; https://doi.org/10.3390/nano7120413
Received: 29 September 2017 / Revised: 7 November 2017 / Accepted: 20 November 2017 / Published: 24 November 2017
Cement composites with nano-additions have been vastly studied for their functional applications, such as strain and damage sensing. The capacity of a carbon nanofiber (CNF) cement paste has already been tested. However, this study is focused on the use of CNF cement composites as sensors in regular concrete samples. Different measuring techniques and humidity conditions of CNF samples were tested to optimize the strain and damage sensing of this material. In the strain sensing tests (for compressive stresses up to 10 MPa), the response depends on the maximum stress applied. The material was more sensitive at higher loads. Furthermore, the actual load time history did not influence the electrical response, and similar curves were obtained for different test configurations. On the other hand, damage sensing tests proved the capability of CNF cement composites to measure the strain level of concrete samples, even for loads close to the material’s strength. Some problems were detected in the strain transmission between sensor and concrete specimens, which will require specific calibration of each sensor one attached to the structure. View Full-Text
Keywords: carbon nanofibers (CNFs); strain sensing; damage sensing; cement composites carbon nanofibers (CNFs); strain sensing; damage sensing; cement composites
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MDPI and ACS Style

Galao, O.; Baeza, F.J.; Zornoza, E.; Garcés, P. Carbon Nanofiber Cement Sensors to Detect Strain and Damage of Concrete Specimens Under Compression. Nanomaterials 2017, 7, 413.

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