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 ==== Hardened Bubbles ====
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-Concrete Canvas: 2006 Pete Brewin and William Crawford, have created Concrete Canvas, a "building in a bag" -- a sack of cement-impregnated fabric. To erect the structure, all you have to do is add water to the bag and inflate it with air. A few hours later the half cylinder-shaped shelter is dried out and ready for use.
-The structure is almost as easy to transport as a tent, but provide better protection and is as durable and secure as a portable building, while being easier to transport.
-unlike current solutions (soft-skinned tents), which offer inadequate protection, or are expensive and difficult to transport, concrete canvas is a rapidly deployable hardened shelter that requires only water and air for construction. it can be deployed by a person without any training in under 40 minutes and is ready to use within 2 hours. plus, with a design life of over 10 years, (tents only survive for 2 years)  the dry weight is 230kg, an 8 man lift, and light enough to be transported on a pick-up truck or light aircraft.
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 Bini Shell System,  In 1964 Dante N Bini built the first hemispherical thin shell structure by pneumatically and