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Journal of Sensors
Volume 2016 (2016), Article ID 3947513, 8 pages
Research Article

Self-Monitoring Strengthening System Based on Carbon Fiber Laminate

1Faculty of Civil Engineering, Silesian University of Technology, Gliwice, Poland
2C-MADE, Centre of Materials and Building Technologies, University of Beira Interior, Covilhã, Portugal
3Research Unit of Fiber Materials and Environmental Technologies (FibEnTech), Universidade da Beira Interior, 6201-001 Covilhã, Portugal

Received 12 February 2016; Revised 27 April 2016; Accepted 12 May 2016

Academic Editor: Hong-Hu Zhu

Copyright © 2016 Rafal Krzywon et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Externally bonded composites reinforced with high-strength fibers are increasingly popular in construction, especially in structures’ strengthening, where the best possible mechanical properties are required. At the same time the ability to autodetect threats is one of the most desirable features of contemporary structures. The authors of the paper have developed an intelligent fabric, wherein the carbon fibers play the role of not only tensile reinforcement but also strain sensor. The idea is based on the construction of the strain gauge, where the thread of carbon fibers arranged in zig-zag pattern works as electrical conductor and is insulated by parallel thread of glass or acrylic fibers. Preliminary laboratory tests were designed to create effective measurement techniques and assess the effectiveness of the strengthening of selected building structures, as reinforced concrete and timber beams. Presented in the paper, selected results of these studies are very promising, although there were some noted problems to be considered in next steps. The main problem here is the control of the cross section of the fibers tow, affecting the total resistance of the fabric. One of the main deficiencies of the proposed solution is also sensitivity to moisture.