Three different models for reliability of building porous materials over time

The great randomness involved in the masonry decay phenomenon, due to environmental attacks, suggests studying it from a probabilistic point of view. Here, the study of evolution of the stone masonry decay has been carried out applying two different probabilistic approaches on experimental data collected on on-site models. Moreover, a third model is proposed; it is based on a deterministic approach, which uses a peculiar delay differential equation. We emphasize that the proposed three methods are really different, nevertheless all of them look effective in order to predict the time taken to reach a given damage level. Indeed the three proposed methods agree in their results