7 ingredients to make Roman concrete quick lime, clay, sand, seawater, fly ash, aggregate, and ANIMAL BLOOD
Also there is a US patent to copy the roman recipe and use blood in concrete
The present invention relates to the use of blood in the construction and building industry, whereby blood and extracts of blood containing hemoglobin are used as air entraining colloids. The recommended process for preparing a lightened material consists in associating a construction element chosen from the cements, mortars and concretes, with at least one air entraining colloid chosen from whole blood, globules, red blood corpuscles and hemoglobin. The invention also relates to the lightened material obtained according to this process.
At this point in time the use of blood as an “air entraining mixture” as filed in the patent seems like cover for some weirdo occultic crap. It’s not difficult to get a good air entrainment in the 4-7% range with readily available admixtures and much over 7% you start running into it affecting the compressive strength unless you further muck around with the recipe.
Adding the air component to the mix increases the concretes resistance to spalling, chipping and pop outs under freeze/thaw cycles. It’s pretty much exclusive to cold weather areas, though air entrainment is an ACI (American Concrete Institute) specified routine test when sampling and testing fresh concrete.
It just appears to me on its face to be one of those “in your face, God” type of actions luciferian clowns like to do to defy in this case biblical proscriptions against using or eating something...