Solid waste-based cementitious materials represent a promising alternative to conventional Portland cement, contributing to a reduction in carbon dioxide emissions and enhancing the recycling of industrial and municipal waste. However, these materials are susceptible to harsh environmental conditions, such as sulphate attack, which may result in expansion, strength degradation, and alterations in permeability. This study systematically investigated the effects of sulphate exposure on the mechanical properties and permeability of cementitious ma...