Abstract: A concrete in which metallic fibers are dispersed, obtained through mixing with water a composition including a cement; ultrafine elements with a pozzolanic reaction; granular elements distributed into two granular classes (C1)>1 mm and <5 mm and (C2) ranges from 5 to 15 mm; cement additions; an amount of water E added in the mixture; a dispersant, and preferably a superplasticizer; metallic fibers, in an amount maximum equal to 120 kg per m3 of concrete, the contents of the various components (a), (b), (C1), (C2), (d) and the amount of water E, expressed in volume, meeting the following relationships: ratio 1: 0.50?(C2)/(C1)?1.20; ratio 2: 0.25?[(a)+(b)+(d)]/[(C1)+(C2)]?0.60; ratio 3: 0.10?(b)/(a)?0.30; ratio 4: 0.05?E/[(a)+(b)+(d)]?0.75; ratio 5: (d)/(a)?0.20. The invention applies to the manufacture of voussoirs without frameworks, of tiles and of elements of the plate, shell type or the like.

Abstract: A concrete in which metallic fibres are dispersed, obtained through mixing with water a composition comprising:

Abstract: The invention concerns a concrete obtained by mixing with water, cement, granular elements, elements with puzzolanic reaction, constituents capable of improving the toughness of the matrix, metal fibers and at least a dispersing agent, in specified conditions and proportions. Said concrete has improved properties compared to prior art concrete comprising metal fibers.

Abstract: An ultra-high performance composite concrete, with low cement and fiber content and having good mechanical properties as well as good impacts, shocks and projectile protection properties, includes hydraulic binder, aggregates, an admixture of metal fibers. Particularly, the composite concrete includes 70% to 85% of particles (A) having a particle size distribution which ranges from 0.01 to 3 mm up to particle size distribution which ranges from 0.01 to 0.50 mm; 2% to 10% of particles (B) having particle size of between 0.01 and 1 .mu.m; 3% to 20% of hydraulic binder; 0.1 to 3% of a dispersant or plasticizer; 0.05% to 8.5% of fibers; and, mixing water, wherein the percentages being weight percentages based on the sum of the weights of constituents a) to d).

Abstract: The invention relates to produced refractory compositions comprising the four following particulate fractions:(1) 30-60% by weight of a coarse fraction at least 50% of which are greater than 0.5 mm;(2) 10-30% by weight of a fine fraction at least 50% of which are smaller than 75 microns;(3) 10-30% by weight of a very fine fraction at least 50% of which are smaller than 5 microns; and(4) 10-30% by weight of an ultra fine fraction at least 80% of which are smaller than 0.1 micron;the fractions being comprised of materials which are inert to water. The refractory compositions, when mixed with less than 10% by weight of water, give injectable pastes suitable for repairing refractory furnace linings.