In the essay types of high strength and high performance concretes are summarised. Their technology of construction, mechanical properties and applications in newly built structural systems or as a retrofitting system in existing structures are also presented. Based on my own experiments I'm going to show the effects of high dosage plastic and steel fibres (2V% - 8V%) on the behaviour of concrete specimens subjected to bending and compression. Other features of the casted concrete specimens were also investigated such as fibre orientation, weight to volume ratio, quality of infiltration, etc....