Ingredients

Papercrete is a material originally developed more than 70 years ago, and recently rediscovered. It consists of paper, water, cement, and sand. The proportion usually used is 4:4:2 (paper, cement, sand), but can vary widely, depending on what it will be used for.
Waste paper
The paper used, comes from a variety of sources and is usually free. Newspaper is the most commonly used but office paper, cardboard, brown paper bags, junk mail, dump  from waste bins and special paper (hammer milled paper) are also used.
Paper fibers:
– add strength to the cement, just as glass fibers add strength to fiberglass
– result in a product that is both lightweight and strong
– when they are mixed with cement they create a hard shell around them, giving papercrete  great strength
– trap the air resulting in very good sound insulating properties
Portland cement
Integral component of papercrete in amount usually equal to paper. No cement the mix is extremely flammable and the material might have termite problems.
Adding cement to the mix:
– Cuts drying time by half and reduces shrinkage 3-5 cm
– Increases strength and resistance to abrasion
– Reduces flammability and termites problems
But:
– Reduces flexibility
– Adds weight
– Reduces R value
– Is a drawback to material s status as green material because it puts a lot of CO2  into the atmosphere
Aggregate
A lot of aggregates like sand or dirt but pumice is about the same price as sand but it is a lot lighter and adds R value (insulation) to the final product.
Adding aggregate:
– Increases volume and mineral content
– Adds thermal mass
– Reduces shrinkage and flammability
– Make the mix stronger
– More impervious to water
But:
– Results in heavier structure
– Reduces R value.
Ingredients: Backyard – soaked newspaper – cement – sand – wooden mold – mixer
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About Menelaos Kokkinos

Menelaos Kokkinos TU Delft mgkokkinos@gmail.com
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