Shows how to create calcium oxide aka quick lime (calcium hydroxide after adding water) from limestone or seashells but no time explaining how to get volcani cash, we can presume because nobody is going to hike a volcano(?)
Insomuch, if I'm going to home depot to grab a bag of volcano ash - guess what else I'm going to buy at the same time? Quick lime
After a brief survey of the topic, it seems the ash from certain areas (such as Mt Vesuvius) had high amounts of aluminum which helped to form this crystalization when it made contact with sea water. @dukeofraul
Well apparently the harbor at Baiae which is on the northwest part of the gulf of naples is where they have some good marine cement structures. You can knock yourself out with this
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[ + ] observation1
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Insomuch, if I'm going to home depot to grab a bag of volcano ash - guess what else I'm going to buy at the same time? Quick lime
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https://www.researchgate.net/profile/Qinfei-Li/publication/318117204_Phillipsite_and_Al-tobermorite_mineral_cements_produced_through_low-temperature_water-rock_reactions_in_Roman_marine_concrete/links/5a0564d10f7e9bc40793f80f/Phillipsite-and-Al-tobermorite-mineral-cements-produced-through-low-temperature-water-rock-reactions-in-Roman-marine-concrete.pdf
...which is kind of boring but has a neat little table at the end where it lists quotes from Pliny and Seneca on how to make the stuff