Computers and Concrete

  • 제19권4호
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  • Pages.413-417
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  • 2017
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Concrete crack rehabilitation using biological enzyme

  • Chen, How-Ji (Department of Civil Engineering, National Chung Hsing University) ;
  • Tai, Pang-Hsu (Department of Civil Engineering, National Chung Hsing University) ;
  • Peng, Ching-Fang (Department of Civil Engineering, National Chung Hsing University) ;
  • Yang, Ming-Der (Department of Civil Engineering, National Chung Hsing University)
  • 투고 : 2015.04.01
  • 심사 : 2017.01.13
  • 발행 : 2017.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

Concrete is a material popularly used in construction. Due to the load-bearing and external environmental factors during utilization or manufacturing, its surface is prone to flaws, such as crack and leak. To repair these superficial defects and ultimately and avoid the deterioration of the concrete's durability, numerous concrete surface protective coatings and crack repair products have been developed. Currently, studies are endeavoring to exploit the mineralization property of microbial strains for repairing concrete cracks be the repairing material for crack rehabilitation. This research aims to use bacteria, specifically B. pasteurii, in crack rehabilitation to enhance the flexural and compression strength of the repaired concrete. Serial tests at various bacterial concentrations and the same $Urea-CaCl_2$ medium concentration of 70% for crack rehabilitation were executed. The results prove that the higher the concentration of the bacterial broth, the greater the amount of calcium carbonate precipitate was induced, while using B. pasteurii broth was for crack rehabilitation. The flexural and compression strengths of the repaired concrete test samples were the greatest at 100% bacterial concentration. Compared to the control group (bacterial concentration of 0%), the flexural strength had increased by 32.58% for 1-mm crack samples and 51.01% for 2-mm crack samples, and the compression strength had increased by 28.58% and 23.85%, respectively. From the SEM and XRD test results, a greater quantity of rectangular and polygonal crystals was also found in samples with high bacterial concentrations. These tests all confirm that using bacteria in crack rehabilitation can increase the flexural and compression strength of the repaired concrete.

키워드

과제정보

연구 과제 주관 기관 : Natural Science Council of Taiwan

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피인용 문헌

  1. A Review of Self-Healing Concrete for Damage Management of Structures vol.5, pp.17, 2018, https://doi.org/10.1002/admi.201800074
  2. Morphological segmentation based on edge detection-II for automatic concrete crack measurement vol.21, pp.6, 2017, https://doi.org/10.12989/cac.2018.21.6.727
  3. Valuation of characteristics strength by utilizing Construction and Demolition (C&D) waste as Recycled Aggregates (RA) in concrete vol.6, pp.1, 2021, https://doi.org/10.1007/s41024-021-00125-2