Here’s a special cloth that hardens itself into a solid structure (just like concrete) whenever water is added to it.Developed by the Concrete Canvas Ltd., this Concrete Cloth can be set into the required form/shape within two hours of adding water. According to the company, “a PVC backing on one surface of the cloth ensures the material is waterproof. Hydrophilic fibres on the opposite surface aid hydration by drawing water into the cement.”
In addition to this, the cloth is heat proof to a certain extent and chemical resistant as well. If required the cloth can also be set under water which signifies its ample utility, starting from use in regular work areas, to emergency situations like natural calamities.
[source : wired.co.uk]