Building materials time dependent reliability: a discussion

From the mathematical point of view, building material deterioration may be formulated as a reliability problem of a system subjected to an aleatory sequence of aggressive events discrete in time. In this research work the problem will be dealt with by making reference to non-stationary probabilistic models. The failure probability function pf (t) will be defined in material service lifetime, tau, terms. The behaviour of some masonry material units subjected to a simulated critical environment are here checked and compared. In them the failure mechanism found is the delamination of the surface. This deterioration process is found to be renewal process and Weibull distributions seem to be suitable to interpret it.