40 Imagine sitting around a board room and someone proposes " Hey, let's put human blood in our concrete ". (patents.google.com) posted 3 years ago by PaintingTruth17 3 years ago by PaintingTruth17 +40 / -0 17 comments share 17 comments share save hide report block hide replies
The Romans used ox blood in their mortar. It created tiny air bubbles which protected the mortar against breaking down in the freezing and thawing cycles over time.