I'll tell you what, the Universe provides!

I have been thinking about writing a short story, where I need some more information about concrete and building structures! Thank you so much for providing all this super interesting and easy to read through info.

What I am looking into, is making a Concrete composition with spores and mushroom mycelium/ground up mushrooms. That would work perfectly with the "Structural Light-weight Concrete" with the addition of gypsum, which some mushrooms love.

The idea is that there was an earthquake in some major city, where there was a lot of damage to buildings, sidewalks, and most minor structures. A company hijacks Cement trucks and local Concrete businesses to illegally introduce mushroom spores and mycelium into the concrete.

The people in charge are preparing for a major Thunderstorm/Rain event, which would soften the concrete and allow for the mushroom fibers to spread through the buildings and further break them, tearing them down, and reintroducing nature into the "Concrete Jungle" City.

Decomposition at its finest.

Is something like that technically feasible? What cement/mixture would you recommend to make my story seem factual/technical?