Self-Healing and Repairing Concrete Cracks Based on Bio-Mineralization

Abstract:

In this paper, three bio-mineralization mechanisms were proposed to repair cement-based materials cracks. The common feature is that the three are all induced by bacterial. A type of bacterial which can decompose urea and release carbonate ions could be applied to repair micro cracks on concrete surface when combining calcium ions. But what need to be noted is that the way of repairing cracks is passive. Some alkaliphilic bacterial spores could be added to concrete when casted and two different types of bacterial were used to realize the function of self-healing. The sources of carbonate ions made them different, the one release carbonate dioxide through its own cellular respiration, the other could transfer carbon dioxide in air to bicarbonate. Coefficient of capillary suction, apparent water permeation coefficient and area repairing rate were applied to characterize the repairing effectiveness. The tests results were that all three bio-mineralization mechanisms showed excellent repair effect to small cracks formed at early ages. When the bacteria were immobilized by ceramsite, the self-healing effect could be improved for the cracks formed at late ages.

• Periodical: Key Engineering Materials (Volumes 629-630)
• Pages: 494-503
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.629-630.494
• Online since: October 2014
• Authors: Chun Xiang Qian*, Mian Luo, Li Fu Ren, Rui Xing Wang, Rui Yang Li, Qing Feng Pan, Huai Cheng Chen
• Keywords: Bacterial, Bio-Mineralization, Carbonate Ions, Concrete, Crack, Repair, Self-Healing

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