Non-invasive FTIR study of mortar model samples: comparison among innovative and traditional techniques Valentina Brunello, Cristina Corti, Antonio Sansonetti, Cristina Tedeschi and Laura Rampazzi Eur. Phys. J. Plus, 134 6 (2019) 270 Published online: 18 June 2019 DOI: 10.1140/epjp/i2019-12667-1