Corn steep liquor as a nutritional source for biocementation and its impact on concrete structural properties
Microbial-induced carbonate precipitation (MICP) has a potential to improve the durability properties and remediate cracks in concrete. In the present study, the main emphasis is placed upon replacing the expensive laboratory nutrient broth (NB) with corn steep liquor (CSL), an industrial by-product, as an alternate nutrient medium during biocementation. The influence of organic nutrients (carbon and nitrogen content) of CSL and NB on the chemical and structural properties of concrete structures is studied. It has been observed that cement-setting properties were unaffected by CSL organic content, while NB medium influenced it. Carbon and nitrogen content in concrete structures was significantly lower in CSL-treated specimens than in NB-treated specimens. Decreased permeability and increased compressive strength were reported when NB is replaced with CSL in bacteria-treated specimens. The present study results suggest that CSL can be used as a replacement growth medium for MICP technology at commercial scale.
KeywordsBiomineralization Curing Organic admixture Concrete Corn steep liquor Carbon and nitrogen content
The authors are thankful to Science and Engineering Research Board (SERB), Department of Science & Technology, Government of India, India, for the financial support under the research Project No. SB/S3/CEE/0063/2013.
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