Cement is the powdery substance that when mixed with clean water binds the other stuff like sand and aggregate(gravel) together.

The hard part that must be done very close to first, in order to make a sustainable colony, would be to establish a chemical processing plant or system on Mars.
Yes we will send the first cement up by rocket but the water, aggregate and filler would come from Mars itself.

pzatchok–
Expand on that if you have a moment.
(my grand-father was an actual civil-engineer, me, not so much.)

broader esoteric question:
What sort of radiation-shielding value does generic concrete provide?

Of all the ideas I have heard, I am dismayed the most by this one. The study at least had no association I could find with NASA, thank goodness. Its going to be a hell of a time just to get astronauts safely to and from Mars without causing loss of life/mission/humanity. Now they want to build structures from blood? Apparently, we need a competition (for clickbait) to make even more gruesome tech to help to go to Mars. What is this world going to?

In my humble opinion, it’s going to be a combination of indigenous aggregates and some sort of polymer-chemistry suitable to curing under the physical constraints of Mars.
(Unless they really intend to breed people for Soylent Green, a thought I would not entirely discount.)

I think these folks might be on to something, but they don’t however have a Space-Research Division.

https://shotcrete.org/

“Shotcrete, gunite , or sprayed concrete is a dry or wet-mix concrete or mortar conveyed through a hose and pneumatically projected at high velocity onto a surface, as a construction technique, first used in 1914 invented by engineer, Heidar Rizouki.”

Hydrogen from Water ice.

CO from the CO2 in the atmosphere, electrolyzed.

Nitrogen from its 2 percent concentration in the atmosphere.

As noted by Greg, Albumin is an available blood protein that can be extracted from blood, and the blood cells put back in the body. Once we approach a million people on Mars it should be available from humans and/or their food animals, and may be producible artificially if we can clone livers of mammalian animals to produce it, as we are already doing that with mammalian muscle tissues.