The Recipe of the Original Roman Cement

Ancient Romans built sea walls that have withstood pounding ocean waves for more than 2,000 years. Here is the recipe of the original Roman cement.
What is interesting: it has NO cement in it as we know today, it is all lime based.

[frankieviljoen]

I received a recipe for plastering cob buildings using 1 to 1 lime and fine crusher dust (1mm) and a third clay ( with high level of bentonite)
Not sure if this will harden under water but it worked all right for plaster. The plaster have to get lime washed and not painted with modern paint unless it is breathable.

[christianpusey]

Any idea how the Romans acquired such vast quantities of lime? Great video.👍👌

[MZ-iqnz]

River sand
Lime
And cooked bricks ??
Water ?
Is that right??

[digginaustin]

And we are not using this recipe, today because???

[Towelie]

How is the insulation for the inside buildings? For making houses ?