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AssigneesRhodia Chimie, Bouygues Travaux Publics, Lafarge
InventorsGilles Orange, Evelyne Prat, Pascal Casanova, Mouloud Behloul
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The invention concerns the use of organic fibers having a melting point lower than 300° C., an average length l more than 1 mm and a diameter Ø not more than 200 μm, 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° C., the concrete consisting of a particularly hardened cement matrix wherein metal fibres are dispersed.
A process for improving the fire resistance of an ultra-high performance concrete which comprises adding to the concrete organic fibers having a melting point of less than 300° C., an average length l of greater than 1 mm and a diameter Ø of at most 200 μm;
A fire-resistant ultrahigh-performance concrete having a 28-day compressive strength of at least 120 MPa, a flexural strength of at least 20 MPa, and a spread value in the unhardened state of at least 150 mm;
Dependencies are inferred from the claim text.