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Article

Transformation of Construction Cement to a Self-Healing Hybrid Binder

1
ERC Advanced Investigator Grant Research Group at the Institute for Physiological Chemistry, University Medical Center of the Johannes Gutenberg University, Duesbergweg 6, 55,128 Mainz, Germany
2
Polymers and Pigments Department, National Research Centre, Dokki, Giza 12622, Egypt
3
Key Laboratory of Karst Dynamics, MLR & GZAR, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
4
Institute of Functional and Clinical Anatomy, University Medical Center of the Johannes Gutenberg University, Johann Joachim Becher Weg 13, 55,099 Mainz, Germany
5
Institute of Materials Science (ICMUV), Universitat de València, C/Catedràtic José Beltrán 2, Paterna, 46980 València, Spain
6
NanotecMARIN GmbH, Mühlstr. 19, 55,218 Ingelheim am Rhein, Germany
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(12), 2948; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms20122948
Received: 22 May 2019 / Revised: 12 June 2019 / Accepted: 14 June 2019 / Published: 17 June 2019
(This article belongs to the Collection Bioactive Nanoparticles)
A new biomimetic strategy to im prove the self-healing properties of Portland cement is presented that is based on the application of the biogenic inorganic polymer polyphosphate (polyP), which is used as a cement admixture. The data show that synthetic linear polyp, with an average chain length of 40, as well as natural long-chain polyP isolated from soil bacteria, has the ability to support self-healing of this construction material. Furthermore, polyP, used as a water-soluble Na-salt, is subject to Na+/Ca2+ exchange by the Ca2+ from the cement, resulting in the formation of a water-rich coacervate when added to the cement surface, especially to the surface of bacteria-containing cement/concrete samples. The addition of polyP in low concentrations (<1% on weight basis for the solids) not only accelerated the hardening of cement/concrete but also the healing of microcracks present in the material. The results suggest that long-chain polyP is a promising additive that increases the self-healing capacity of cement by mimicking a bacteria-mediated natural mechanism. View Full-Text
Keywords: Portland cement; inorganic polyphosphate; microcapsules; coacervate; concrete; microcracks; self-healing; soil bacteria Portland cement; inorganic polyphosphate; microcapsules; coacervate; concrete; microcracks; self-healing; soil bacteria
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MDPI and ACS Style

Müller, W.E.G.; Tolba, E.; Wang, S.; Li, Q.; Neufurth, M.; Ackermann, M.; Muñoz-Espí, R.; Schröder, H.C.; Wang, X. Transformation of Construction Cement to a Self-Healing Hybrid Binder. Int. J. Mol. Sci. 2019, 20, 2948. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms20122948

AMA Style

Müller WEG, Tolba E, Wang S, Li Q, Neufurth M, Ackermann M, Muñoz-Espí R, Schröder HC, Wang X. Transformation of Construction Cement to a Self-Healing Hybrid Binder. International Journal of Molecular Sciences. 2019; 20(12):2948. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms20122948

Chicago/Turabian Style

Müller, Werner E.G., Emad Tolba, Shunfeng Wang, Qiang Li, Meik Neufurth, Maximilian Ackermann, Rafael Muñoz-Espí, Heinz C. Schröder, and Xiaohong Wang. 2019. "Transformation of Construction Cement to a Self-Healing Hybrid Binder" International Journal of Molecular Sciences 20, no. 12: 2948. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms20122948

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