**Acknowledgements**

The research work was financially supported by the Romanian National Program for Research within the framework of the projects: 'Materials and performance technologies designed to obtain asphalt milling knives' no. PCCA 188/2012—MATFREZ and 'Nanomaterials filler materials for joining ceramics', no. 71-118/2007—NANOCERAD. In addition, the author would like to thank her colleagues Prof. PhD Eng. Victor Geanta from Politehnica University of Bucharest and PhD Eng. Horia Binchiciu from SC. SUDOTIM AS Timisoara (Romania), for relevant advice and active collaboration during the experimental research.
