Keywords: fibre-concrete, micro-reinforcement, optimization of parameters of micro-reinforcement.

Objects exposed to compression require the use of high-performance concrete, where the limiting safety factor is usually insufficient shear strength. An effective possible solution is the application of micro-reinforcement, of which the parameters and batching influence the final qualitative indicators of fibre-concrete.

Currently many theoretical methods are known that allow the prediction of fibre-concrete properties. However, so far there is no reliable method known that would allow prediction of the qualitative indicators of fibre-concrete. This paper is an attempt to develop such a method which would allow the optimization of fibre-reinforced mixtures and their qualified design.

The method presented will proceed in the following steps:

1. assessment of the ability of the micro-fibre to ensure the tensile strength,
2. determination of the reaction of the reinforcing elements,
3. optimization of fibres and their volume (or density) concentration.

Even though fibre-concrete is seemingly the simplest building material for the construction of objects exposed to compression, its use has many pitfalls. The most dangerous is the over-dimensioning of their volume concentration which can lead to grain opening and thus to a decrease of concrete density and a decrease of its quality (mainly with concrete of a maximal grain size of over 8mm). This paper is a contribution to the elimination of such a risk.

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