In case anyone mistakes this for a summary of the article, here's what it actually says: > Modern cement mixtures tend to erode, particularly in the presence o

In case anyone mistakes this for a summary of the article, here's what it actually says: > Modern cement mixtures tend to erode, particularly in the presence of seawater, but the Roman recipe of volcanic ash, lime, seawater and a mineral called aluminium tobermorite actually reinforces the concrete and prevents cracks from expanding, researchers found.