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Diatomaceous earth as a protective vehicle for bacteria applied for self-healing concrete

  • J. Y. Wang
  • N. De Belie
  • W. Verstraete
Biotechnology Methods

Abstract

Crack repair is crucial since cracks are the main cause for the decreased service life of concrete structures. An original and promising way to repair cracks is to pre-incorporate healing agents inside the concrete matrix to heal cracks the moment they appear. Thus, the concrete obtains self-healing properties. The goal of our research is to apply bacterially precipitated CaCO3 to heal cracks in concrete since the microbial calcium carbonate is more compatible with the concrete matrix and more environmentally friendly relative to the normally used polymeric materials. Diatomaceous earth (DE) was used in this study to protect bacteria from the high-pH environment of concrete. The experimental results showed that DE had a very good protective effect for bacteria. DE immobilized bacteria had much higher ureolytic activity (12–17 g/l urea was decomposed within 3 days) than that of un-immobilized bacteria (less than 1 g/l urea was decomposed within the same time span) in cement slurry. The optimal concentration of DE for immobilization was 60% (w/v, weight of DE/volume of bacterial suspension). Self-healing in cracked specimens was visualized under light microscopy. The images showed that cracks with a width ranging from 0.15 to 0.17 mm in the specimens containing DE immobilized bacteria were completely filled by the precipitation. Scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) were used to characterize the precipitation around the crack wall, which was confirmed to be calcium carbonate. The result from a capillary water absorption test showed that the specimens with DE immobilized bacteria had the lowest water absorption (30% of the reference ones), which indicated that the precipitation inside the cracks increased the water penetration resistance of the cracked specimens.

Keywords

Bacillus sphaericus Ureolytic activity Microbial CaCO3 Carrier Crack repair 

Notes

Acknowledgments

The authors appreciate the financial support from the Research Foundation Flanders (FWO-Vlaanderen) for this study (Project No. G.0157.08). The authors express their thanks to the Department of Inorganic Chemistry and the Department of Physics for providing BET and SEM analysis.

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Copyright information

© Society for Industrial Microbiology 2011

Authors and Affiliations

  1. 1.Magnel Laboratory for Concrete Research, Faculty of Engineering and ArchitectureGhent UniversityGhentBelgium
  2. 2.Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience EngineeringGhent UniversityGhentBelgium

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