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Self-healing of early age cracks in cement-based materials by mineralization of carbonic anhydrase microorganism.

Qian C, Chen H, Ren L, Luo M - Front Microbiol (2015)

Bottom Line: The repair effect reduced with the increasing of cracking age.Cracks width influenced self-healing effectiveness significantly.The transportation of CO2and Ca(2+) controlled the self-healing process.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Science and Engineering, Southeast University Nanjing, China ; Research Institute of Green Construction Materials, Southeast University Nanjing, China.

ABSTRACT
This research investigated the self-healing potential of early age cracks in cement-based materials incorporating the bacteria which can produce carbonic anhydrase. Cement-based materials specimens were pre-cracked at the age of 7, 14, 28, 60 days to study the repair ability influenced by cracking time, the width of cracks were between 0.1 and 1.0 mm to study the healing rate influenced by width of cracks. The experimental results indicated that the bacteria showed excellent repairing ability to small cracks formed at early age of 7 days, cracks below 0.4 mm was almost completely closed. The repair effect reduced with the increasing of cracking age. Cracks width influenced self-healing effectiveness significantly. The transportation of CO2and Ca(2+) controlled the self-healing process. The computer simulation analyses revealed the self-healing process and mechanism of microbiologically precipitation induced by bacteria and the depth of precipitated CaCO3 could be predicted base on valid Ca(2+).

No MeSH data available.


The growth characteristics of the microorganism.
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Figure 1: The growth characteristics of the microorganism.

Mentions: Bacillus mucilaginous L3 (China Center of Industrial Culture Collection, CICC) was used in this study. The growth characteristics of the microorganism is shown in Figure 1.


Self-healing of early age cracks in cement-based materials by mineralization of carbonic anhydrase microorganism.

Qian C, Chen H, Ren L, Luo M - Front Microbiol (2015)

The growth characteristics of the microorganism.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4631987&req=5

Figure 1: The growth characteristics of the microorganism.
Mentions: Bacillus mucilaginous L3 (China Center of Industrial Culture Collection, CICC) was used in this study. The growth characteristics of the microorganism is shown in Figure 1.

Bottom Line: The repair effect reduced with the increasing of cracking age.Cracks width influenced self-healing effectiveness significantly.The transportation of CO2and Ca(2+) controlled the self-healing process.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Science and Engineering, Southeast University Nanjing, China ; Research Institute of Green Construction Materials, Southeast University Nanjing, China.

ABSTRACT
This research investigated the self-healing potential of early age cracks in cement-based materials incorporating the bacteria which can produce carbonic anhydrase. Cement-based materials specimens were pre-cracked at the age of 7, 14, 28, 60 days to study the repair ability influenced by cracking time, the width of cracks were between 0.1 and 1.0 mm to study the healing rate influenced by width of cracks. The experimental results indicated that the bacteria showed excellent repairing ability to small cracks formed at early age of 7 days, cracks below 0.4 mm was almost completely closed. The repair effect reduced with the increasing of cracking age. Cracks width influenced self-healing effectiveness significantly. The transportation of CO2and Ca(2+) controlled the self-healing process. The computer simulation analyses revealed the self-healing process and mechanism of microbiologically precipitation induced by bacteria and the depth of precipitated CaCO3 could be predicted base on valid Ca(2+).

No MeSH data available.