Date: 2017-07-16 08:20 am (UTC)
From: [personal profile] eub
James linked to this one from 2014:
https://archaeologynewsnetwork.blogspot.ca/2014/12/secrets-of-roman-concrete-revealed.html
which likewise says "it's the volcanic ash", but they have different minerals as the important consequences. -- or maybe not so much, str├Ątlingite and aluminum tobermorite are both calcium aluminum silicates

The newer work seems to be specifically about reaction with seawater, the older work about toughness by impeding crack propagation.

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