Rimworld mod Concrete Implemented concrete. As hard as stony material, but build much faster. Save a lot of building work hour, but have 2 drawbacks:

1 Requires limestone, which is not available on all maps. You can grab limestones from other map, or buy limestone bricks. 2 Need some days to hydrate, before it's fully hydrated, it will be weak.

Requires: HugsLib: https://ludeon.com/forums/index.php?topic=28066.0

Support: No Water No Life: If you have "No Water No Life" installed, building concrete will require water, make it more expensive then vanilla. https://github.com/himesama1301/MizuMod/releases

Please load this mod after those mods listed up here.

PS: Concrete is actually a Neolithic technology, but I set it to industrial so dropper start will be easier to research. It's significantly more simpler for modern people.