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Abstract

The invention concerns the use of organic fibers having a melting point lower than 300.degree. C., an average length l more than 1 mm and a diameter .O slashed. not more than 200 .mu.m, in ultra high performance concrete for improving the concrete fire resistance, the amount of organic fibers being such that their volume ranges between 0.1 and 3% of the concrete volume after setting and the concrete having a compressive strength at 28 days of at least 120 Mpa, a bending strength of at least 20 Mpa, and a spread value in non-hardened state of at least 150 mm, the values being for a concrete preserved at 20.degree. C., the concrete consisting of a particularly hardened cement matrix wherein metal fibres are dispersed.

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First Claim