Piezoresistive characterization of graphene/metakaolin based geopolymeric mortar composites
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Piezoresistive characterization of graphene/metakaolin based geopolymeric mortar composites C. Lamuta1,2*, L. Bruno2, S. Candamano3, L. Pagnotta2 1
Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
2
University of Calabria, DIMEG, Ponte P. Bucci, cubo 44C, 87030 Arcavacata di Rende (CS)
3
University of Calabria, DIATIC, Ponte P. Bucci, cubo 44A, 87030 Arcavacata di Rende (CS)
*Corresponding author: [email protected]
ABSTRACT
Geopolymers are recently developed ceramic materials produced by alkaline activation of thermally activated natural materials such as metakaolin. Due to their promising application in the field of structural components, the presence of a piezoresistive effect is a very useful property for such materials because it allows the real time self-monitoring of civil infrastructures. As observed for cement-based materials, the use of a conductive filler can enhance the piezoresistive response by avoiding measuring issues related to the electrical polarization. In this work we present preliminary results about the piezoresistive characterization of a metakaolin based geopolymeric mortar filled with graphene nanoplatelets. Composites with different graphene weight concentrations (0, 0.1, 0.5, 1%) were produced and the gauge factor (the ratio between the electrical resistance variation and the imposed strain) was calculated by means of dynamic four-probe resistance measurements. Very high gauge factor values (in the range of 1000-2000) were recorded and they can vary according to the dispersion quality of the graphene nanoplatelets into the ceramic matrix.
INTRODUCTION A number of deterioration mechanisms, including fatigue, environmental degradation and extreme natural events, damages civil infrastructure systems. Coupled with lack of adequate maintenance, these factors could lead to deterioration of strength and reduced service life of the structure. Structural health monitoring more and more becomes a technique for ensuring the health and safety of civil infrastructures and attracts research interests and active development interests of scientists and engineers [1Downloaded from https://www.cambridge.org/core. College of Library - Columbia University, on 30 Nov 2017 at 07:12:36, 3]. Different methods for the localTeachers monitoring concrete structures were developed and subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2017.595
lots of them include the use of embedded devices such as electric-resistance strain gauges, optic sensors, piezoelectric ceramics, shape memory alloys, fiber reinforced polymer bars, etc. [4-8]. However, these techniques have some drawbacks such as low sensitivity and reliability and are often expensive and of limited durability. The demand of reliable and low cost technologies indeed is increasingly growing. Within this context we present for the first time results about the piezoresistive characterization of a geopolymeric mortar. Geopolymers are ceram
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