Sulfur concrete


Sulfur concrete is a composite construction material, composed mainly of sulfur and aggregate.
Cement and water, important compounds in normal concrete, are not part of sulfur concrete. The concrete is heated above the melting point of sulfur ca. 140 °C in a ratio of between 12% and 25% sulfur, the rest being aggregate. After cooling the concrete reaches a high strength, not needing a prolonged curing like normal concrete. Sulfur concrete is resistant to some compounds like acids which attack normal concrete, however unlike ordinary concrete, it cannot withstand high heat, thus it is not fire resistant. Sulfur concrete was developed and promoted as building material to get rid of large amounts of stored sulfur produced by hydrodesulfurization of gas and oil. Sulfur concrete is also a possible building material for a lunar base. As of 2011, sulfur concrete has only been used in small quantities when fast curing or acid resistance is necessary.
The material has been suggested by researchers as a potential building material on Mars, where water and limestone are not available, but sulfur is.