this post was submitted on 02 May 2025
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The biggest issue seems to be around a lake of thinking. Recycling used plastics into more plastic is certainly energetically infeasible, and letting plastics escape to contaminate the environment is also unacceptable. However plastic can be recycled, or perhaps reused, into other things, notably as a partial replacement for aggregate in concrete. This process is low energy, doesn't require sorting the plastic, and actually enhances the thermal and noise insulation properties of the concrete, whilst also reducing it's overall weight. There are undoubtedly other things a stable, non-biodegradable, waterproof and hardwearing substance could be used for given some though.
The more I see plastic being integrated into construction, the more I worry we're just postponing the inevitable. Concrete, stone and steel and basically reusable or recyclable and low impact on the environment when dumped. Plastic on the other hand slowly degrades into microplastics and seeps into waterways. Sometimes we forget that buildings don't last forever.
That's a fair concern, but, as you say, concrete is recyclable, and I would expect (though I admit I haven't looked for studies) that it still would be when it has some amount of plastic aggregate. If the plastic breaks down in the concrete, the microplastics should be trapped, and will be reincorporated when the concrete is reused.
Nothing is going to be a perfect solution to plastic, we need to find alternatives to its use, but in the interim it seems sensible to find effective ways to reuse it rather than just dumping it and hoping for the best.
Maybe the best solution was to trap it in our bodies all along! /jk
Putting it in concrete just delays the inevitable.
It does, but it will also bind a lot of the micro plastic pieces into the concrete matrix, which, I think (and, again, as I said, I haven't actually gone looking for any research on this), would keep them from entering the environment. If the concrete is then recycled, typically by crushing and using as aggregate, it would further trap the particles. It's not a perfect solution, but I don't think there is a perfect solution to plastics in general, we just have to find less harmful alternatives.
Best solution imo is burning it with a filter after use. Gasification will happen anyway but this way at least it doesn't damage ecosystems.
Probably designed by a nuclear engineer