Investigation on random distribution of fibres in cement composites

The problem of homogenous distribution of fibres in a cast element always occurs with application of concrete mixes modified by fibres. Past research has proven that the size of an element influences the direction of fibres in the concrete mix. If the depth of a given piece is not much greater than the fibres' length, in the majority of cases they are positioned horizontally. The lack of regularity and directional reorientation of fibres during technological processes causes some difficulties, linked with expected random distribution in the concrete mass. The analysis of the impacted this randomness on workability and strength parameters of concrete is investigated for normal and self-compacting concretes. In this paper an analysis is presented in which cross-sections of concrete beams with steel fibres are closely examined.