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Utilization of microbial induced calcite precipitation for sand consolidation and mortar crack remediation
- Source :
- HBRC Journal, Vol 8, Iss 3, Pp 185-192 (2012)
- Publisher :
- Production and hosting by Elsevier B.V.
-
Abstract
- The microbes can hydrolyze urea by urease enzyme to produce ammonium as well as carbonate ions and in the presence of calcium ions which can precipitate calcium carbonate; this process is called “biocalcification” or microbial induced calcite precipitation (MICP).This technology is environmentally friendly not only because it gives strength to sand body, but also it allows water to penetrate to sand body, which is unlike silicate cement that will destroy the ecosystem of the earth. Calcium carbonate precipitated by bacteria acts as a binding material to sand particles, so incompact sand will be consolidated. Calcium chloride, calcium acetate and calcium nitrate (1 M) as calcium sources were tested for their ability to consolidate sand by mixing with urea (1 M) and bacteria cells (one optical density, 1 OD). The key point of this study aimed to choose the suitable calcium source which produces higher compressive strength and lower water absorption. The results showed that the degree of crystallinity and amount of precipitated calcium carbonate, as well as the consequent increase in strength of consolidated sand, in case of calcium chloride medium are higher than those precipitated in case of calcium acetate as well as calcium nitrate media. In addition, consolidated sand by calcium chloride was also used for cement mortar crack remediation.
- Subjects :
- Calcite
Materials science
Precipitation (chemistry)
Induced
chemistry.chemical_element
Calcium
Calcium nitrate
lcsh:TH1-9745
chemistry.chemical_compound
Compressive strength
Calcium carbonate
chemistry
Chemical engineering
lcsh:TA1-2040
Carbonate
Crack remediation
Bacterial cells
Sand consolidation
lcsh:Engineering (General). Civil engineering (General)
Microbiologically induced calcite precipitation
lcsh:Building construction
Subjects
Details
- Language :
- English
- ISSN :
- 16874048
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- HBRC Journal
- Accession number :
- edsair.doi.dedup.....ceb6541b92292a8714aacda556ba7b51
- Full Text :
- https://doi.org/10.1016/j.hbrcj.2013.02.001