Effects of biocementation on some properties of cement-based materials incorporating Bacillus Species bacteria – a review
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Date
2019-11Author
Mutitu, Karanja D.
Munyao, Mulwa O.
Wachira, Jackson M.
Mwirichia, Romano K.
Thiong'o, Karanja J.
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Show full item recordAbstract
There is a growing need in the construction industry to improve transfer and
durability aspects of Portland pozzolana cement. Ureolytic bacteria have recently
emerged as potential micro-organisms well known for precipitation of calcium
carbonate through microbiologically induced calcite precipitation (MICP) process.
MICP process has emerged as a viable mechanism for improvement of the PPC
performance. This paper presents an in-depth discussion on the effects of Bacillus
pseudofirmus, Bacillus sphaericus, Sporosarcina pasteurii, Bacillus cereus, Bacillus
megaterium and Bacillus subtilis on some selected physico-mechanical properties of
cement-based materials. These properties include standard consistency, setting time,
compressive strength, water absorptivity, porosity and chloride ingress. The
influence of pH, temperature and various bacteria nutrient requirements on optimum
MICP process is also presented. In conclusion, benefits and drawbacks on the use of
MICP has been discussed. MICP as a potential technique for improvement of
physico-mechanical properties as well as repair of cracked cement-based structures
has been discussed.
URI
http://dx.doi.org/10.1080/21650373.2019.1640141http://repository.embuni.ac.ke/handle/embuni/2278