The long-term sustainability of shotcrete reinforced with alternative fibre materials, such as basalt and synthetic fibres, is an emerging field of study with significant implications for construction durability and performance. Current research focus is on developing a suitable test method for structural capacity that can be used in a laboratory environment to evaluate these materials under accelerated conditions, simulating long-term usage in various environmental contexts. One critical aspect is to understand how fibres made from synthetic or basalt materials will behave over extended periods, as existing data primarily pertains to traditional steel fibres. To address this gap, we are devising accelerated testing protocols that mimic the thermal and chemical stressors these materials might encounter over decades.