THE LABORATORY INVESTIGATION ON THE INFLUENCE OF THE POLYPROPYLENE FIBRES ON SELECTED MECHANICAL PROPERTIES OF HARDENED SELF-COMPACTING CONCRETE

The laboratory investigation presented in the paper focuses on the influence of the polypropylene fibres on compressive and flexural strength of self-compacting concrete. The paper deals with two volume ratios 0.3% and 0.9% of 19 mm and 38 mm long PP fibres. On the basis of the tests performed, the addition of PP fibres has a minor effect on compressive strength of SCC and pronounced when analysing the flexural tensile strength of the matrix. In case of 19 mm long fibres the increase of post-peak parameters was considerable, however, not proportional to the fibres volume ratio. The 38 mm long PP fibres applied as a SCC reinforcement needs further investigations, as for a smaller amount of the fibres it doesn't meet the requirements for the composites.