Skip to main content
Fig. 4 | Heritage Science

Fig. 4

From: On-site monitoring for better selection of stone repairs: a case study

Fig. 4

Situations of wetting and drying in a stone, and analogy with a cooling in a repair. In a situation of wetting, the stone is originally dry (a) and its surface is wetted by a rain (b). It leads to a situation of self-restraint where the superficial layer is in compression (c). In a situation of drying, the stone is originally wet (d), and its surface dries out (e). The wet core restrains the dry surface from shrinking, causing tension in the superficial layer (f). Adapted from [5]. An analogy can be made in a stone repaired with a mortar. The stone and the repair are in equilibrium at a certain temperature (g), until the surface is cooled down. Due a mismatch between the coefficients of thermal expansion, the repair mortar tries to shrink (h), but since the two materials are sealed, the mortar is restrained by the stone (i) which leads to tension in the mortar

Back to article page