Dry premixture for flexible concrete and method for its preparation and use thereof

The invention relates to a cementitious powder blend comprising, based on total weight-45-90 wt % Portland cement; pref. 50-80 wt %-0-25 wt % siliceous fly ash; pref. 5-20 wt %-0-25 wt % limestone; pref. 5-20 wt %-5-30 wt % polyvinylalcohol, pref. 5-15 wt %. The PVA preferably has-a size distribution with D10=170-270 μm, D50=370-450 μm. D90=690-850 μm and D100=1000-1300 μm; and-an ester value in the range of 1-250 mg KOH/g, as determinable by EN-ISO 3681:1998 and/or wherein the polyvinyl alcohol has a viscosity of a 4% aqueous solution at 20° C. in the range of 1-40 mPa·s, as determinable by EN-ISO 12058-1:2002. A substantial part of the PVA may be present in the form of hybrid particles composed of Portland cement and the polyvinylalcohol. Further, the invention relates to concrete composed of the cementitious powder blend, water and aggregate as well as flexible concrete products made therefrom. The cementitious powder blend is used for-for the preparation of a paving of a road or other infrastructural element; for the preparation of a base course for a road or other infrastructural element; for the manufacture of a floor of a building; for the repair of a concrete structure; for grouting; or-as an injection into a concrete structure.