[suggestion]Liquid concrete that hardens after being dumped somewhere

i see others are suggesting adding concrete slabs or similiar to place buildings on but i think it would be better if you could make concrete and dump it somewhere then let it harden
that way players could build the concrete slabs but also other things like using retaining walls to form platforms or ramps with pipes built into them, or obviously like others suggested; making concrete slabs to place buildings on
obviously since concrete hardens over time a cement truck / mixer truck would be needed too
concrete is partially cement which already exists in the game, the rest is water and aggregate (sand usually), these can be mixed in different concentrations but for simplicity, it would just be one type of it.
i think this idea is complete but this could be added too, im not sure about it though,
pre-cast slabs of concrete allowing the construction of custom ramps by placing them in different ways and making several shapes of them

Concrete could be poured into player-designed molds, which themselves are made of voxels (on the same grid as buildings.) At the very least, single cubic voxels would be plenty. However, tools to place and stretch blocks like wedges and rounded corners would be wonderful. My mind wanders to Roblox and Brickadia for how their blocks and stretching said blocks works. It doesn't need to be particularly fancy, but a generic system that can take any arbitrary 3D solid and turn that into concrete terrain would be ideal (so adding new shapes becomes trivial.)
Wedges in particular, I feel, should not come in predefined shapes and sections, but should be placed and stretched to the desired shape. Otherwise I foresee wedges (and especially rounded corners/circles) contributing massively to UI bloat and player frustration.
IMO placing concrete should take steel, and you can add even more steel to make the concrete stronger (able to support taller vertical walls and hold terrain)