Concrete Barrier
A composite material composed of sand, stone, and cement. This block can not be upgraded and is likely only found in the creative menu.
Harvest drops
Small Stone× 25
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Destroyed Stone (75% of the time) where it lands.
Where to find (29 POIs)
Area 7 (tier 5), Navezgane Corrections (tier 5), Navezgane County Jail (tier 5), Red Mesa Compound (tier 5), U.S. Army Post #7 (tier 5), Butcher Pete's (tier 4), Close Encounters Gun Range (tier 4), Doominium Tower (tier 4), Dumpsy Clinic (tier 4), Fort Camo (tier 4), Fort Choppa (tier 4), Green Hill (tier 4), NDC Checkpoint Five (tier 4), NDC Checkpoint Four (tier 4), NDC Checkpoint One (tier 4), Fort Razor (tier 3), NDC Checkpoint Two (tier 3), Pal's Marina (tier 2), The Animal Hoarder (tier 2), The Wagner Residence (tier 2), Ranger Station Beta (tier 1), Downtown Construction Site, Infested Construction Site, Junkin, Meridian Center, Trader Bob, Trader Hugh, Trader Joel, Void Apartments.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.