Effects of Water Content and Temperature on Bulk Resistivity of Hybrid Cement/Carbon Nanofiber Composites
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation of Cement–CNF Materials and Resistivity Measurements
- R is the electrical resistance measured between connectors,
- A is the surface area of a connector,
- l is the distance between connectors.
2.2. X-Ray Micro-Computed Tomography (µ-CT)
2.3. Scanning Electron Microscopy (SEM)
2.4. Powder X-Ray Diffraction (XRD)
3. Results and Discussion
3.1. Significance of Electrical Connection Type for Bulk Resistivity of Cement–CNF Transducers at Higher Temperatures
3.2. Effect of w/c Ratio and Pore Water Content on Bulk Resistivity of Cement–CNF Materials
4. Conclusions
- (1)
- The electrical response of these materials is related with two types of water present in the cement: (a) water that is mixed with cement powder and is partially consumed in cement hydration processes, and (b) free water that is present in cement pores that can be removed by drying.
- (2)
- The increase in the water to cement ratio at the stage of cement mixing results in increased bulk resistivity. This has been attributed to the precipitation of larger amounts of hydration products that leads to a larger separation of carbon nanofibers and, thus larger resistivity.
- (3)
- The material response to a stepwise temperature increase up to 180 °C is related to free water release from cement pores and the dry materials are relatively insensitive to temperature changes. The re-saturation of pores with water results in a slightly increased resistivity but the re-saturation process is not entirely reversible.
- (4)
- The choice of electrical connector material, form, and size are important factors that have to be considered when designing high temperature sensors based on conductive cements. A very important design parameter that must also be taken into account is the effective contact surface area of the electrical connector material with the cement–CNF matrix. It has been shown that the change in the type of electrical connection can lead to two orders of magnitude different bulk resistivity results for the same material.
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample Name | Form | Dispersant | CNF/Cement | Water/Cement | Dispersant/Cement |
---|---|---|---|---|---|
K1 | cube | SP | 0.03 | 0.58 | 0.012 |
K2 | cube | SP + SDS | 0.03 | 0.58 | 0.012 |
C1 | cylinder | SP | 0.03 | 0.49 | 0.012 |
C2 | cylinder | SP | 0.03 | 0.58 | 0.012 |
C3 | cylinder | SP | 0.03 | 0.66 | 0.012 |
C1 | C2 | C3 | |
---|---|---|---|
Corundum | 100.0 | 100.0 | 100.0 |
CH | 8.1 | 9.3 | 10.0 |
C4AF | 3.5 | 3.0 | 2.8 |
C3S | 7.0 | 4.2 | 3.7 |
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Gawel, K.; Taghipour Khadrbeik, M.A.; Bjørge, R.; Wenner, S.; Gawel, B.; Ghaderi, A.; Cerasi, P. Effects of Water Content and Temperature on Bulk Resistivity of Hybrid Cement/Carbon Nanofiber Composites. Materials 2020, 13, 2884. https://doi.org/10.3390/ma13132884
Gawel K, Taghipour Khadrbeik MA, Bjørge R, Wenner S, Gawel B, Ghaderi A, Cerasi P. Effects of Water Content and Temperature on Bulk Resistivity of Hybrid Cement/Carbon Nanofiber Composites. Materials. 2020; 13(13):2884. https://doi.org/10.3390/ma13132884
Chicago/Turabian StyleGawel, Kamila, Mohammad Ali Taghipour Khadrbeik, Ruben Bjørge, Sigurd Wenner, Bartlomiej Gawel, Amir Ghaderi, and Pierre Cerasi. 2020. "Effects of Water Content and Temperature on Bulk Resistivity of Hybrid Cement/Carbon Nanofiber Composites" Materials 13, no. 13: 2884. https://doi.org/10.3390/ma13132884