Abstract
The research was conducted to comprehensively study the efficiency and effectiveness of bacteria-based concrete repair technology. In the research, Sporosarcina pasteurii were applied as working bacteria in healing agent, the calcium source was selected by analysis of product crystalline phases. The prepared healing agent was used to repair cracked concrete specimens. After repair computed tomography was applied to evaluate the physical sealing. Specimens with and without cracking and specimens with crack-sealing were processed, and a series of durability tests were conducted to study the sealing caused rejuvenation, including water absorption, chloride penetration resistance, frost resistance and sulfate attack resistance. Results show that calcium nitrate is suitable as calcium source, which reacts with hydrolysed urea to entirely seal the crack surface and can fill more than half of the crack space. The impermeability of the cracked concrete is greatly rejuvenated after repair, and both frost resistance and sulfate attack resistance are compensated in certain scale. This research has recommended calcium nitrate as calcium source for bacteria-based mineralization, evaluated sealing efficiency, and importantly, confirmed a good rejuvenation in concrete durability.
| Translated title of the contribution | Repair and rejuvenation of cracked concrete by microbiologically-induced calcite-precipitation |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 641-647 |
| Number of pages | 7 |
| Journal | Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) |
| Volume | 50 |
| Issue number | 2 |
| DOIs | |
| State | Published - 1 Mar 2020 |
| Externally published | Yes |
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