Transformation of Construction Cement to a Self-Healing Hybrid Binder

International Journal of Molecular Sciences

Meik Neufurth¹  Xiaohong Wang²  WernerE.G. Müller²  Emad Tolba²  Maximilian Ackermann²  Shunfeng Wang²  Rafael Muñoz-Espí³  HeinzC. Schröder⁴  Qiang Li⁵ 

[1] GZAR, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China;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;Institute of Functional and Clinical Anatomy, University Medical Center of the Johannes Gutenberg University, Johann Joachim Becher Weg 13, 55,099 Mainz, Germany;Institute of Materials Science (ICMUV), Universitat de València, C/Catedràtic José Beltrán 2, Paterna, 46980 València, Spain;;Key Laboratory of Karst Dynamics, MLR &

关键词: Portland cement;    inorganic polyphosphate;    microcapsules;    coacervate;    concrete;    microcracks;    self-healing;    soil bacteria;   

DOI  :  10.3390/ijms20122948

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown