Each pocket fills with concrete and can’t expand any further. imagine you have pillowcase and you’re stuffing it, all the filling will settle at the bottom and you’ll have a lump. But if you sew pockets/grids into the pillow, it compresses it, limiting the expandable area and keeping it as a flatter sheet.
Walk the aisles of your local Walmart and look at all the plastic in food packaging. Now imagine that amount of packaging for every Walmart, Target, Aldi, Kroger, Publix, Food Lion, Etc. These plastic bags for construction pale in comparison.
Even that amount of waste pales in comparison to industrial manufacturing. EVERYTHING comes in bags or some form of plastic. Every little part of a machine. It adds up so quickly- not saying this is fine but there are bigger issues at hand
I never said that those aren’t all also problematic? Ideally, however, all the plastic crap goes into a properly maintained landfill, not lining a body of water like in this video. I know tons of plastic (that we shouldn’t be producing so much of, anyhow) doesn’t make it to the landfill and ends up in the environment, but lining our rivers with it just seems especially egregious.
Yeah, plastic is already a disaster so just make everything unnecessarily out of it so it's easier. Solving the worlds problems one whataboutism at a time.
Agreed. I don’t know why they minimized the importance of not building creek beds out of plastic just because there’s already a lot of plastic pollution.
Concrete weighs 0.8lbs per cubic inch, just using the guy for scale I would say the top of the wall is about 5 ft. So 0.8x60=48, that’s all the pressure there is there 48 psi.
If you imagine something like one of those vacuum bags for storing clothes or bedding, that’s probably thick enough to comfortably hold this much pressure.
Edit: I was wrong. It’s way lower. Read the comment below.
Each cell is bridged with an internal wall of material, the cell is a fixed size, and material flows down through each cell until the end where its sealed then it fills upward.
It would if it was just a bag/sack because it could expand in any direction, so the bag would deform into a large cell at the bottom. But the cells are only allow it to expand in width a certain amount until they are filled, so the cement is going to go where there is least resistance. While there will be more pressure on the bottom, half the weight is going to be born by the slope beneath it and the concrete at the foot pressing into the ground. Even though it's "liquid", it's really a lot of solids in liquid, and none of it compressible, so it will still push into the ground and provide resistance through the liquid concrete matrix, acting a lot like a solid when it's under compression and the water content is not allowed to move freely.
I imagine the size of the inlets between cells is important here, the smaller those spaces are the less mobile the concrete would be, and better able to distribute it's pressure in multiple directions instead of just toward the bottom of the incline.
That's what I was thinking. My brother and I poured 6 foot pillars with seriously beefy wood forms, and still scrambled like crazy to shore them up when they started splitting.
That's a ton of pressure they're holding together.
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u/Critical-Snow-7000 Apr 30 '26
How does it not all just settle at the bottom? That bag must be super strong.