Experiments were conducted on repression of salt damages, corrosion, and
neutralization of concrete by making use of effective microorganisms, their extracts,
and effective microorganism-mixed ceramics. We obtained a result that steel plates
inserted into chloride ion-added concrete test pieces comprising effective
microorganism test materials were found to maintain original luster without corrosion.
Furthermore, reduction in the amount of chloride ions contained in concrete was
confirmed after surveys by such means as EPMA on behavior of chloride ions in
chloride ion-mixed concrete. We have made successful achievements in studies on
reaction mechanism governing reaction between synthesized C3A and chloride ions.
We have also confirmed that blending of effective microorganism materials leads to
an increase in strength of concrete seen in such effects as brought by AE agents