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 (CSUB1/SUB)1 mm and 5 MM AND (CSUB2/SUB) 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 mSUP3 /SUPof concrete, the contents of the various components (a), (b), (CSUB1/SUB), (CSUB2/SUB), (d) and the amount of water E, expressed in volume, meeting the following relationships: ratio 1: 0.50=(CSUB2/SUB)/(CSUB1/SUB)=1.20; ratio 2: 0.25=[(A)+(B)+(D)]/[(CSUB1/SUB)+(CSUB2/SUB)]=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.
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