ON-Tech project is based on the idea to produce modern and green restoration mortars according to the recipe of ancient mortars from the Trajan Aqueduct (Rome, II century AD), which showed high durability and resistance thanks to a synergic combination of raw materials, grain size and production technology. The main objective is to realize eco-friendly restoration mortars, not harmful to humans and compatible with ancient materials, with high performance and minimum CO2 production to make them more effective and sustainable, to preserve cultural heritage for future generations. First, a preliminary characterization of three typologies of Pozzolan materials from the surrounding of Bracciano Lake has been provided by means of optical microscopy (OM), X-ray powder diffraction (XRPD), Fourier-transform infrared spectroscopy (FTIR) and Scanning Electron Microscopy (SEM-EDS). The results showed differences in the matrix, leucite crystals (presence, dimension, typology), amount of phenocrystals (clinopyroxenes and feldspars) and porosity. After the preliminary investigations, the pozzolan materials compatible with ancient samples were chosen for the new formulations, which have been then analyzed from the mineralogical point of view by FTIR and XRPD and non-destructive tests (usb analysis, peeling tests, Karsten tube, sponge test) in order to assess physical and mechanical characteristics and durability of the new products.