Fig. 3

Kinetics of hydric swelling of the repair mortar and, in the inset, of the Ostermundigen Blue sandstone. Four days of immersion make the repair material swell up to 5 mm m⁻¹. In the inset is shown the swelling of the Ostermundigen Blue sandstone. It reaches a value of 1.25 mm m⁻¹ in only few minutes of immersion