Binders are one of the basic constituent of mortars  that plays an important role to their mechanical behavior and their behavior in physico-chemical interactions with the environment. The type, the quantity and the fineness of the binders result in different properties in the setting and in the hardening stage of mortars.

In the present paper very fine materials in the scale of nano were added to conventional binders such as lime and natural pozzolan. Properties of workability of the fresh mixtures, compression strength and porosity of the harden specimens were recorded in combination with structural observations using Scanning Electron Microscopy (SEM). Also, pore size distribution properties were recorded using Mercury Intrusion Porosimetry (M.I.P.). Based on the results, structural changes have been observed in nano-modified structures and early-age strength has been achieved in pozzolan mixtures. Pores, larger than 10μm have been reduced in mixtures with nanoparticles. The research is a precursor for the influence of nanoparticles to macro-scale properties of repair, lime-based mortars.