<p>Concrete structures exposed to harsh conditions often require repairing and maintenance in order to ensure the preservation of its integrity. Selecting an appropriate repair material depends on the understanding of its behaviour and the guarantee of its compatibility and durability. This research is aimed to experimentally study the effect of supplementary cementitious materials as marble powder (MP) and nano-silica (NS) on the performance of self-compacting repair mortars reinforced with polypropylene fibres (PPF). Three series of mortars (PPF, PPF + NS, PPF + MP) were prepared and evaluated. Previously, an optimisation of fibre dosage in terms of fresh and hardened states was assessed, then incorporating MP and NS as cement replacement. The evaluation was carried out on rheological properties and mechanical strength. In addition to thermal conductivity, durability properties (mercury intrusion porosity) and adhesion on composite specimens (repair mortar/substrate concrete) under compressive test. Fresh tests showed that 0.06% of PPF is the optimum dosage. Plastic viscosity and yield stress rise with MP introduction and decline with NS. Good correlations are obtained between workability and rheological parameters in all series. Moreover, incorporating both MP and NS to fibre reinforced repair mortar increases its thermal conductivity compared to control mortar. NS helps in improving significantly the compressive strength as well as early age adhesion strength. While the use of MP reduces considerably porosity rate.</p>