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View Diary: Cement domes - Shelter from the storm (32 comments)

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  •  how about Hempcrete? (1+ / 0-)
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    Hempcrete is a mixture of hemp hurds (shives) and lime (possibly including natural hydraulic lime,[1] sand, pozzolans or cement) used as a material for construction and insulation.[2] It is marketed names like Hemcrete, Canobiote, Canosmose, and Isochanvre.[3] Hempcrete is easier to work with than traditional lime mixes and acts as an insulator and moisture regulator. It lacks the brittleness of concrete and consequently does not need expansion joints.[3]
    However, the typical compressive strength is around 1 MPa,[4] around 1/20 that of residential grade concrete. Hempcrete walls must be used together with a frame of another material that supports the vertical load in building construction. Hempcrete's density is 15% of traditional concrete, as well as carbon negative.[5] Like other plant products, the hemp crop absorbs CO2 gas as it grows, retaining the carbon and releasing the oxygen. 165 kg of carbon can be theoretically absorbed and locked up by 1 m3 of hempcrete wall over many decades.[6]
    Flavell and David Madera, his partner at HT, which is based in Asheville, North Carolina, see hemp as the way of the future. "It is by far the greenest building material on the market right now," says Flavell. Not convinced? Hempcrete, which consists of hemp, lime, and water, is carbon-negative (the mixture requires carbon from the air to dry and seal it), chemical-free, completely biodegradable, fire- and pest-resistant, and vapor-permeable. Another key benefit is hemp's insulation value, which is greater than virtually any other cellulose plant used in construction.

    without the ants the rainforest dies

    by aliasalias on Tue May 21, 2013 at 02:36:41 PM PDT

    [ Parent ]

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