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Materials 2013, 6(10), 4776-4786; doi:10.3390/ma6104776
Article

Self-Sensing Properties of Alkali Activated Blast Furnace Slag (BFS) Composites Reinforced with Carbon Fibers

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Received: 11 September 2013 / Revised: 24 September 2013 / Accepted: 17 October 2013 / Published: 22 October 2013
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Abstract

In recent years, several researchers have shown the good performance of alkali activated slag cement and concretes. Besides their good mechanical properties and durability, this type of cement is a good alternative to Portland cements if sustainability is considered. Moreover, multifunctional cement composites have been developed in the last decades for their functional applications (self-sensing, EMI shielding, self-heating, etc.). In this study, the strain and damage sensing possible application of carbon fiber reinforced alkali activated slag pastes has been evaluated. Cement pastes with 0, 0.29 and 0.58 vol % carbon fiber addition were prepared. Both carbon fiber dosages showed sensing properties. For strain sensing, function gage factors of up to 661 were calculated for compressive cycles. Furthermore, all composites with carbon fibers suffered a sudden increase in their resistivity when internal damages began, prior to any external signal of damage. Hence, this material may be suitable as strain or damage sensor.
Keywords: strain sensing; damage sensing; alkaline cement; carbon fibers; multifunctional composites strain sensing; damage sensing; alkaline cement; carbon fibers; multifunctional composites
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.

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Vilaplana, J.L.; Baeza, F.J.; Galao, O.; Zornoza, E.; Garcés, P. Self-Sensing Properties of Alkali Activated Blast Furnace Slag (BFS) Composites Reinforced with Carbon Fibers. Materials 2013, 6, 4776-4786.

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