Kyoto, Japan -- Concrete harbors distinct microbial zones whose signatures survive the heat of routine core sampling, a discovery researchers say could one day put structural health diagnostics within reach of general maintenance staff and even residents.
Concrete may be one of the world’s most familiar materials, yet much is still unknown about its inner microbial world. Researchers from Hiroshima University and Kyoto University found that once concrete hardens, microbes introduced through raw materials are sealed inside, forming interior communities largely isolated from those on the surface -- and whose DNA signatures can survive the 70°C heat of drilling for routine core sampling.
Researchers say these findings, published in Case Studies in Construction Materials, suggest that microbes could serve as early-warning indicators of hidden structural deterioration. In Japan, where overseeing the safety of aging buildings increasingly falls to building managers, general maintenance staff, and even residents, such signals might one day inform simpler tools that put diagnostics within reach of non-specialists -- much like how thermometers and blood pressure monitors allow anyone to check their health.
“I was motivated by the idea of making the maintenance of concrete structures more accessible to a wider range of people,” said China Kuratomi, study first author and doctoral student at Hiroshima University’s Graduate School of Advanced Science and Engineering. “Just as we notice changes in our health through everyday indicators such as body temperature and visit a doctor when necessary, I hope that building conditions can also be understood through various indicators, with specialists providing detailed diagnosis when needed.”
