Microscopical and mechanical evaluation of the durability of SiO2 aggregates Hassan El Bahraoui, Lahcen Khouchaf and Amor Ben Fraj Eur. Phys. J. Appl. Phys., 74 2 (2016) 24610 Published online: 03 May 2016 DOI: 10.1051/epjap/2015150426