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; - 0 - 25 wt. % siliceous fly ash; - 0- 25 wt. % limestone; and - 5-30 wt. % polyvinylalcohol, preferably polyvinylalcohol having a size distribution with D 10 =170-270 µm, D 50 =370-450 µm, D 90 =690-850 µm and D 100 =1000-1300 µm. The polyvinylalcohol may be present in form of redispersible particles or in form of hybrid particles composed of Portland cement and 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 cemenetitious powder blend is used - 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.