Abstract
Glass fiber reinforced cement (GRC) is a composite material made of portland cement mortar and alkali resistant (AR) fibers. AR fibers are added to portland cement to give the material additional flexural strength and toughness. However, ageing deteriorates the fibers and as a result the improvement in the mechanical properties resulted from the fiber addition disappears as the structure becomes old. The aim of this paper is monitoring GRC ageing by nondestructive evaluation (NDE) techniques. Two different NDE techniques—(1) nonlinear impact resonant acoustic spectroscopy analysis and (2) propagating ultrasonic guided waves—are used for this purpose. Both techniques revealed a reduction of the nonlinear behavior in the GRC material with ageing. Specimens are then loaded to failure to obtain their strength and stiffness. Compared to the un-aged specimens, the aged specimens are found to exhibit more linear behavior, have more stiffness but less toughness. Finally, undisturbed fragments on the fracture surface from mechanical tests are inspected under the electron microscope, to understand the fundamental mechanisms that cause the change in the GRC behavior with ageing.
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Acknowledgements
The authors want to acknowledge the financial support of the Ministerio de Ciencia e Innovación MICINN, Spain, and FEDER funding (Ondacem Project: BIA 2010-19933) and BES-2011-044624. Also thanks to PAID-02-11 Program from Universitat Politècnica de Valencia.
The authors would also like to acknowledge the contributions of José Benedito (Universitat Politècnica de Valencia) and John S. Popovics (University of Illinois at Urbana-Champaign) to this work.
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Appendix
Material nonlinearity for aged and un-aged specimens was also measured from the side band energy variations with ageing for two dominant peaks in the frequency ranges, 105–145 kHz and 145–185 kHz. Figure 17 shows how the side band energy was approximately computed. If the peak amplitude is denoted by ‘A’ then it is assumed that the side band starts at a frequency for which the amplitude value is reduced to R×A as shown in the figure. It should be noted that R is a small factor, say between 0.1 and 0.3. For each peak a total frequency range of 2×S=40 kHz is assumed to include the central peak width and the two side band lengths on its two sides. For example in Fig. 17 the 40 kHz range extends from 105 kHz to 145 kHz. As the value of R increases the side band lengths should increase but the central peak width should decrease. If the area under the two sidebands is (E1+E2) and the area under the central peak is Ec then the ratio \(N = \frac{E1 + E2}{Ec}\) should increase with R. It should also increase if the material nonlinearity increases even when the R value is kept constant. Therefore for a fixed value of R, the parameter N can be considered as an indirect measure of the material nonlinearity.
Figure 18 shows plots of N for three different GRC specimens before and after the ageing processes. Two graphs are obtained from two dominant peaks. In each graph N values are provided for five values of R (0.1, 0.15, 0.2, 0.25 and 0.30) for three different specimens before ageing (open markers) and after ageing (solid triangular markers). Note that irrespective of the R value, the nonlinearity parameter N in general decreases with ageing.
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Eiras, J.N., Kundu, T., Bonilla, M. et al. Nondestructive Monitoring of Ageing of Alkali Resistant Glass Fiber Reinforced Cement (GRC). J Nondestruct Eval 32, 300–314 (2013). https://doi.org/10.1007/s10921-013-0183-y
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DOI: https://doi.org/10.1007/s10921-013-0183-y