[email protected] (composite rebar) belongs to the class of so called fibre composite materials. In fibre composites fibres are combined with other materials to achieve improved properties and synergy effects. The properties of the resulting material can be customized by choosing specific fibres, by adjusting the fibre orientation and by varying the additive and binder contents. One of the best known composites is glass fibre reinforced polymer (GFRP). It is being used in many fields, such as electronics and ship building, to produce light weight, high strength and extremely durable components.