Feasibility of Using 3D Printed Polyvinyl Alcohol (PVA) for Creating Self-Healing Vascular Tunnels in Cement System.
Materials (Basel, Switzerland)
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Li, Z., Souza, L. R. d., Litina, C., Markaki, A., & Al-Tabbaa, A. (2019). Feasibility of Using 3D Printed Polyvinyl Alcohol (PVA) for Creating Self-Healing Vascular Tunnels in Cement System.. Materials (Basel, Switzerland), 12 (23)https://doi.org/10.3390/ma12233872
Pursuing long-term self-healing infrastructures has gained popularity in construction field. Vascular networks have the potential to achieve long-term self-healing in cementitious infrastructures. To avoid further monitoring non-cementitious tubes, sacrificial material can be used a way of creating hollow channels. Here, we report a new method for fabrication of complex 3D internal hollow tunnels using 3D printing of polyvinyl alcohol (PVA). The behaviour of 3D printed PVA structures in cement pastes was investigated using computed-tomography (CT) combined with X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive spectroscopy (SEM/EDX). Results showed that (i) 1300 minutes were needed to fully dissolve a 1g 3D printed PVA structure, different pH solutions did not significantly change the PVA dissolving process compared with neutral environment; (ii) low water/cement ratios can minimize early stage cracking resulted from PVA expansion; (iii) PVA-cement interaction products were mainly calcite and Ca-polymer compound. In conclusion, controlling the PVA expansion through decreasing the w/c ratio provides a promising approach to achieve 3D hollow channels in cement and therefore making it possible for creating complex tunnels within self-healing cementitious materials.
Financial support from the UK Engineering and Physical Sciences Research Council for the programme grant Resilient Materials for Life (EP/02081X/1, 2017–2022) is gratefully acknowledged.
EPSRC (via Cardiff University) (EP/P02081X/1)
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External DOI: https://doi.org/10.3390/ma12233872
This record's URL: https://www.repository.cam.ac.uk/handle/1810/300370
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/
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