A concrete mix comprising sand, fine aggregates, binder, fibers and various additives, having a consistency of S2-S5 and SF1-SF3, where S means concrete slump in mm and SF means concrete flow in mm , a compressive strength in the range of 30-80 MPa and a ductility represented by the following values: 30 fc 80 MPa 3 ffl 12 MPa 3 fR1 12 MPa 2.5 fR3 15 MPa, where fc is compressive strength, ffl is flexural strength, fR1 is resistance at the opening of the cracking mouth of 0.5 mm and fR3 is resistance at the opening of the cracking mouth of 2.5 mm , in which the concrete mix contains at least 390 kg / m3 of binder, the concrete mix comprises a paste volume of 300-600 liters, the concrete mix contains at least two Fiber Systems A and B, the System Fibras A consists of metallic fibers with a dosage of 25-100 kg / m3 with respect to the concrete mix and c With a maximum resistance of at least 1200 MPa, a length of 35-100 mm, the Fiber System B has a dosage of 0.2% -0.9% per m3 of the concrete mix, in which the Fibras B comprises 65-90% by volume of metallic fibers having a length of 5-35 mm, the concrete mix contains a general additive system consisting of at least 2 sub-additive systems I and II, in which the The first additive system I comprises at least 2 polycarboxylic acid copolymers (PCE), a strong water reducing PCE and a workability retention PCE, in which the second additive system II is a stabilizer obtained from a compound selected from group consisting of modified cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, natural starch, modified starch, branched modified starch, natural gums, xanthan gum, fine silica, colloidal silica, fumed silica, and any combination thereof.
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