The Influence of Selected Composition Factors on the Rheological Properties of Fibre Reinforced Fresh Mortar

In the paper the methodology and test results of the investigation are presented and discussed on the influence of fibres on Theological properties of modified standard mortars. The rheological parameters of fibre reinforced fresh mortars (FRFM) - yield value and plastic viscosity were determined. FRFM behaves as a Bingham body, their rheological parameters were determined by using rheometer to pastes and mortars. In the research, an experimental verification of a significance of an influence: W/C ratio, volume fraction of fibres, lengths and kind of materials of fibres on rheological properties of FRFM was investigated. In the paper the results obtained for mixes with polypropylene, steel, carbon and glass fibres are presented. The first step of the procedure was a rheological identification of fiber-mortars, which was completed based on the delimitation of the tension due to an assignment of characteristic dependence - speed of non-dilatational strain, in the form of a curve flow and acceptance of adequate model and rheological equalizations.This equalization is a base to the experimental analyses which influences composition factors of mixtures on the character of their flowing and rheological parameters. The analysis of the results of these measurements permitted on the following qualifications: reliable statistics of rheological parameters from variables, indications of workability forms of mortars with fibres and approximate reliability among rheological parameters of FRFM.