Utilization of Stone Wool Kiln Ash in Cement-Based Materials

The main goal of this study was to validate a circular production route utilizing the waste ash generated during stone wool production in cementitious binders. To achieve this goal, two types of waste ash with different compositions and particle sizes were used. The performance evaluation results showed that silica-based ashes exhibit pozzolanic behavior, reduce the amount of portlandite, and can improve the strength of the mortar even at early ages. The ashes increased the initial setting time regardless of their composition. The outcomes of this study create an economic value for large volumes of material of previously zero value.