Process for producing fire-resistant high performance concrete composition and fire-resistant high performance concrete composition per se

摘要

The present invention relates to the use of organic fibers having a melting point lower than 300 degC, an average length (l) more than 1 mm and a diameter {phi} not more than 200 microns, in ultra high performance concrete for improving the concrete fire resistance wherein the amount of organic fibers being such that their volume ranges between 0.1 and 3 percent of the concrete volume after setting and wherein the concrete having a compressive strength after 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 wherein the values being for a concrete preserved at 20 degC, and wherein the concrete consisting of a particularly hardened cement matrix with metal fibers dispersed therein.