There are many concrete projects, such as benches for sitting and walkway fill, that can be made using light-weight Styrofoam Concrete. By substituting Styrofoam trash for store-bought gravel in the concrete mix, one saves on not only weight, but also on the cost of materials.
To the best of my knowledge, Styrofoam is not a popular material for plastic recyclers. Recycling it at home eliminates transportation costs for this bulky and low-value material. One to do this is to ‘crumble it’ and use between walls and under floors as insulation.
Many people don’t own the property where they live, so maybe the incentive to build a castle for the owner over time is not there. Instead of filling our dumps with this stuff, we could be building cities out of it, if we were motivated enough.
I live on an island, and our dumps are filling up fast. Taking waste and finding constructive uses for it is the best way to gracefully live with all the trash we generate.
Styrofoam concrete probably has good thermal insulation, compared to rock concrete. It might be a useful construction material in both hot and cold climates.
I’ve got problems Huston – go to link above to fer the full low-down and dirty on Styrofoam concrete