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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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Detalles Bibliográficos
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
Descripción
Sumario: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.