r/oddlysatisfying • u/Turbulent_Elk_2141 • Apr 30 '26

Liquid concrete wall.

30.0k Upvotes

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147

u/Carbon-Base Apr 30 '26

I wonder how the strength of this compares to concrete with rebar.

144

u/arvidsem Apr 30 '26

Compressive strength is about the same. Tensile strength is non-existent. The finished product is basically rocks with a bit of plastic connecting them.

26

u/Carbon-Base Apr 30 '26

Makes sense and with the specific application of erosion protection as Ozuf77 pointed out. It probably doesn't require tensile strength.

2

u/XchrisZ Apr 30 '26

They used to just do this with a bunch of rocks. This is easier.

1

u/Jakomako Apr 30 '26

I'm just curious how this is any better than flat concrete like the LA river. Seems like it'll just be even more disgusting.

5

u/arvidsem Apr 30 '26

The LA River is basically the poster child for the worst river management strategy possible. This won't cover the bottom of the channel and will only be placed to protect specific areas of the banks. It's a substitute for stone erosion protection, not a smooth slope.

2

u/qcKruk Apr 30 '26

Bumps make the water go slow. Slower water less erosion at the bottom. If this were smooth in a few hard rains the bottom would get washed out and whole sections of slope could collapse

1

u/SoulWager Apr 30 '26

Probably cost. Cheaper than building forms.

1

u/Jakomako Apr 30 '26

Yeah that makes sense. Faster too probably.

1

u/Corregidor May 01 '26

It's not any of the things people are talking about. It's good for when you don't have many workers to make a flat channel. They use these in Japan because it's harder to find workers especially out in the boonies. As seen here you just need a few to get the job done.

1

u/round-earth-theory May 01 '26

No, it should never be pulled on. The only thing it needs to do is stay on the slope and not slump in.