The use of heat- and alkali-resistant bacteria is essential for
the biological repair of damaged concrete. Lysinibacillus boronitolerans
YS11 was isolated from the rhizosphere of Miscanthus
sacchariflorus. The increased pH in the urea-minus
condition during the growth of the YS11 strain promoted calcium
carbonate (CaCO3) formation. To identify the optimum
medium that promoted the growth of the YS11 strain, a Plackett-
Burman design was conducted for the screening process.
Consequently, malt powder, rice bran, (NH4)2SO4, and corn
syrup were chosen to enhance YS11 growth. The optimization
of these four useful factors was carried out using a central
composite design. To obtain higher survivability in mortar,
the sporulation process is essential, and additional factors
such as Mn2+, Fe2+, and Ca2+ were found to contribute
to sporulation. A mixture of L. boronitolerans YS11 spore
powder, cement, paste, sand, yeast extract, calcium lactate,
and water showed a healing effect on a 0.3 mm mortar crack
in 7 days. Furthermore, calcium carbonate precipitation was
observed over the crack surface. Thus, we confirmed that mortar
treated with YS11 spore powder was effective in healing
micro-cracks in concrete.
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