Generally, there are several mechanisms that
control the soil biocementation including (1) filling (or
clogging) the voids between soil particles by CaCO3
formed by consequence products of ureolysis; (2)
filling (or clogging) the voids between soil particles by
growth of bacterial biomass and biofilms; (3) coating
and binding (or bridging) the soil particles with
CaCO3; and (4) coating and binding (or bridging) the
soil particles with bacterial biomass and biofilms.
Several researchers including this study have proposed
the use of ureolytic bacteria for CaCO3 forming,
precipitating and strengthening of sandy soil. However
not only bacteria, but also other ureolytic producing
organisms (i.e. microalgae, plant) or extraction of
enzyme urease products can be used for soil
biocementation process.