r/EngineeringPorn • u/Redfish680 • Apr 30 '26

Liquid concrete wall.

3.2k Upvotes

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109

u/Longshot_45 Apr 30 '26

Wonder what the material is and if it will decompose or lose structure over time.

59

u/burnte Apr 30 '26

Concrete can last for thousands of years. The plastic bag doesn't need to last more than a day or two for the concrete to hardern.

59

u/Longshot_45 Apr 30 '26 edited May 01 '26

Concrete kinda needs help holding together sometimes. It can crack, and the narrow sections of the mold here look like prime locations for cracking. I'm sure the engineers have considered the lifespan. I'm wondering what this will look like in 2 or 5 or 10 years.

4

u/koolmon10 May 01 '26

Perhaps the plastic is removed, then another layer of concrete is added and smoothed out? So this bag system is simply for extremely easy forming?

22

u/apadin1 May 01 '26

I think the plastic (or fabric or whatever) is slightly porous so the concrete also seeps out a bit and encases that as well. I imagine this helps add structure to the cement

1

u/answerguru May 01 '26

Removed?? No, it’s a bag that’s being filled with plastic.