There are a few mysteries in this world that sometimes offer a better outcome of not knowing about them. https://patents.google.com/patent/US4203674A/en a Google patent will show that Blood being used as a bonding agent was an idea proposed a long time ago, the mystery is if it is being used to this day.
Steepshot
Do we consider blood as so cheap, what is the need to replace water with blood, for light weight structures there are number of other alternative then why such brutal and cruel way.