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Abstract

Disclosed is a fiber-reinforced cement composition particularly useful to make pipes or sheets. This composition comprises up to 70% by weight of a fibrous-like synthetic forsterite obtained by calcination of chrysotile asbestos fibers at a temperature of from 650.degree. C. to 1450.degree. C., said synthetic forsterite having an MgO:SiO2 ratio lower than 1.1, a raw loose density of from 3 to 40 pcf, a thermal conductivity 'k' factor of from 0.25 to 0.40 BTU. in/hr. .degree.F. ft.sup.2 and a fusion point of from 1600.degree. to 1700.degree. C. The composition also comprises a hydraulic binder, which is preferably Portland cement, and reinforcing fibers such as cellulose, synthetic fibers, glass wool, rock wool or their mixtures, in such an amount as to give sufficient strength to the composition to make it operative.

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First Claim