While the effectiveness of the coating in preventing stress corrosion within few days after its application on the glass substrate was proven in a previous work (Mariggiò et al. 2020), the analysis of its durability is the main objective of the present contribution. In this context, three scenarios were analysed to consider most of the possible sources of ageing a glass structural element might be subjected to: (i) cyclic loading, obtained by subjecting coated samples to cyclic loads in order to stress repeatedly the coating and evaluate the appearance of micro-cracking that can reduce the water vapor barrier effect; (ii) natural weathering, performed by exposing coated samples to atmospheric agents; (iii) artificial weathering, carried out by exposing coated specimens to fluorescent UV lamps, heat and water.
The value of 0.15 MPa/s, which caused fracture of the samples within 6 to 14 min, was chosen based on evidences that such a rate is low enough to reveal the effects of stress corrosion (Lindqvist et al. 2012; Mariggiò et al. 2020). The bending strength, σf, was calculated from the fracture load, Qf, by means of Eq. (1) and the results were compared to those of freshly coated and un-coated glass samples, reported in Mariggiò et al. (2020). Examples of the crack pattern typically obtained with the coaxial double ring test are shown in Fig. 6 for two extreme values of bending strength: the higher is the bending strength, the smaller is the average fragments size. It is worth noticing that the test is valid only if the origin of fracture is located inside the footprint of the loading ring.
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