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Plastic Bottle Reactions to Concrete

Posts: 1
Location: Springfield, MO
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Note: Not actually sure if I'm in the right forum, I tried to find the closest one to this. I did search the forums to attempt to find an answer already and unless I'm missing something, I haven't seen this question already asked.

I have a question! I am getting ready to build some dry stone retaining walls in my backyard, and I want to use bottle bricks for the bottom layers... experimenting to get the basics out of the way for whenever I sell this property later and build my actual house.

I have some questions. I have been researching to find out if there are any reactions between plastic encased with concrete - but I can't seem to find anything regarding this, other than using plastic "mulch" mixed with various cements to make bricks. The problem is, I can't find out what level of plastic they used for that. I'm wanting to recycle used soda and water bottles for this project, since they don't naturally degrade in landfills, and out of the plastic levels (1-7) Polyethylene terephthalate (the plastic they make soda bottles with) is 1. PVC is number 3, to give you an idea of the numbering system.

Can anyone give me any information regarding this? I don't want to use the wrong kind of concrete mix, or wrong cement, or too much of something, and it ends up becoming unstable in a few years. Also: I have never actually built anything in my life, so this is all based on research I have conducted in preparation. (I'm a bit of a perfectionist, if you can't tell). I just want to ensure the chemical compositions of what I'm wanting to use won't react negatively over a period of time, or if I'm missing something that might work better. Any other suggestions or ideas??

And I have some windows in my back room that I want to replace, but I really like them. They're old fashioned Scandinavian windows (sort of?) and when I put the new ones in, I am toying with the idea of taking the old ones and attaching them to the top of one of the retaining walls (preferably next to my back deck) to make a miniature greenhouse garden for winter, until I can get a bigger one situated. So I really like the idea of dry stone retaining walls, but the windows are very manmade - square and perfectly shaped, and the stones are irregularly shaped (natural stone). Any ideas for how to make these blend better?
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