Bacterial spores and the nutrients they will need to feed on are
added as granules into the concrete mix. But water is the
missing ingredient required for the microbes to grow. So the
spores remain dormant until rainwater works its way into the
cracks and activates them. The harmless bacteria - belonging to
the Bacillus genus - then feed on the nutrients to produce
limestone. The bacterial food incorporated into the healing
agent is calcium lactate - a component of milk. The microbes
used in the granules are able to tolerate the highly alkaline
environment of the concrete. "In the lab we have been able to
show healing of cracks with a width of 0.5mm - two to three
times higher than the norms state," Dr Jonkers explained. James
L. Salmon, Esq. 300 Pike Street Cincinnati, Ohio 45202 Summary
of Services and James L. Salmon's CV Collaborative Construction
Website