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Transformation of Construction Cement to a Self-Healing Hybrid Binder

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...

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Autores principales: Müller, Werner E.G., Tolba, Emad, Wang, Shunfeng, Li, Qiang, Neufurth, Meik, Ackermann, Maximilian, Muñoz-Espí, Rafael, Schröder, Heinz C., Wang, Xiaohong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6627329/
https://www.ncbi.nlm.nih.gov/pubmed/31212901
http://dx.doi.org/10.3390/ijms20122948
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author Müller, Werner E.G.
Tolba, Emad
Wang, Shunfeng
Li, Qiang
Neufurth, Meik
Ackermann, Maximilian
Muñoz-Espí, Rafael
Schröder, Heinz C.
Wang, Xiaohong
author_facet Müller, Werner E.G.
Tolba, Emad
Wang, Shunfeng
Li, Qiang
Neufurth, Meik
Ackermann, Maximilian
Muñoz-Espí, Rafael
Schröder, Heinz C.
Wang, Xiaohong
author_sort Müller, Werner E.G.
collection PubMed
description 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(+)/Ca(2+) exchange by the Ca(2+) 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.
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spelling pubmed-66273292019-07-23 Transformation of Construction Cement to a Self-Healing Hybrid Binder Müller, Werner E.G. Tolba, Emad Wang, Shunfeng Li, Qiang Neufurth, Meik Ackermann, Maximilian Muñoz-Espí, Rafael Schröder, Heinz C. Wang, Xiaohong Int J Mol Sci Article 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(+)/Ca(2+) exchange by the Ca(2+) 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. MDPI 2019-06-17 /pmc/articles/PMC6627329/ /pubmed/31212901 http://dx.doi.org/10.3390/ijms20122948 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Müller, Werner E.G.
Tolba, Emad
Wang, Shunfeng
Li, Qiang
Neufurth, Meik
Ackermann, Maximilian
Muñoz-Espí, Rafael
Schröder, Heinz C.
Wang, Xiaohong
Transformation of Construction Cement to a Self-Healing Hybrid Binder
title Transformation of Construction Cement to a Self-Healing Hybrid Binder
title_full Transformation of Construction Cement to a Self-Healing Hybrid Binder
title_fullStr Transformation of Construction Cement to a Self-Healing Hybrid Binder
title_full_unstemmed Transformation of Construction Cement to a Self-Healing Hybrid Binder
title_short Transformation of Construction Cement to a Self-Healing Hybrid Binder
title_sort transformation of construction cement to a self-healing hybrid binder
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6627329/
https://www.ncbi.nlm.nih.gov/pubmed/31212901
http://dx.doi.org/10.3390/ijms20122948
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