Patent ID: 6887309

Claim:
A concrete in which metallic fibres are dispersed, obtained through mixing with water a composition comprising: (a) a cement with particles having a grain size D50 ranging from 10 to 20 Î¼m; (b) ultrafine elements with a pozzolanic reaction, element particles of said ultrafine elements having a grain size D50 of maximum 1 Î¼m; (c) granular elements distributed into two granular classes C 1 and C 2 defined as follows: (C 1 ): particles with a size higher than 1 Î¼m and lower than 5 mm, (C 2 ): particles with a size ranging from 5 to 15 mm; (d) cement additions with a grain size D50 lower than or equal to 100 Î¼m; (e) an amount of water E added; (f) a dispersant or a superplasticizer, being present in a dry matter proportion ranging from 1.5 to 5% by volume based on the cement; (g) metallic fibres, in an amount maximum equal to 120 kg per m 3 of concrete and having an individual length l such that the concrete has a l/Ï† ratio of at least 2, l being the fibre individual length and Ï† being the diameter of the biggest grain; wherein contents of components (a), (b), (C 1 ), (C 2 ), (d) and the amount of water E, expressed in volume, meet the following relationships: ratio 1: 0.50â‰¦(C 2 )/(C 1 )â‰¦1.20 ratio 2: 0.25â‰¦[(a)+(b)+(d)]/[(C 1 )+(C 2 )]â‰¦0.60 ratio 3: 0.10â‰¦(b)/(a)â‰¦0.30 ratio 4: 0.50â‰¦E/[(a)+(b)+(d)]â‰¦0.75 ratio 5: (d)/(a)â‰¦0.20.