Papercrete
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Papercrete is a fairly new low cost mortar mix for making blocks, panels, poured walls, roofs, plasters, renders, pond liners, etc.
There are many variations on the theme, with various mixes tailored to for example structural mortar, insulation, waterproof pond lining, paths and so on.
Papercrete's novelty means there is a lack of long term studies on its performance, but the results of its short time of use are very encouraging.
Papercrete is mostly pulped scrap paper, with in most cases the addition of cement. Many other materials can also be incorporated, including any of the following:
- wood chippings
- sawdust
- lime
- sand
- silt
- subsoil
- expanded polystyrene
- fibrous weed and plant material
- broken bricks, blocks, tiles, stone, etc
- ground brick, tile, glass, stone waste
- clinker, slag, etc
A good starting point, with lots of pretty pics is here: