Global industry follows a linear model for economic growth. The construction sector significantly contributes to the world economy, CO2 emissions, and primary resource consumption. A shift toward circular economy and reclamation of anthropogenic deposits is essential to decouple economic growth from resource use. This study investigates filter dust from calcined clay production in Germany as such a deposit. The research compares raw material, untreated and calcined filter dust, and the industrial base product to evaluate the potential of using filter dust as a supplementary cementitious material (SCM). A comprehensive assessment of the mineralogical, physical, and chemical characteristics was conducted. Furthermore, the reactivity of the materials after heat treatment was benchmarked against established SCMs. The study demonstrates the usability of some 20,000 t of annual waste as SCM. Results confirm that the material exhibits sufficient pozzolanic reactivity, comparable to fly ash, without further treatment. Its reactivity during the first 72 hours surpasses that of fly ash, indicating potential for higher early strength development. The particle size distribution is similar to that of one compared CEM I. Additionally, the study reveals that increasing calcination temperature leads to a decrease in specific surface area and water demand, while offering opportunities to optimize reactivity.     «

Global industry follows a linear model for economic growth. The construction sector significantly contributes to the world economy, CO2 emissions, and primary resource consumption. A shift toward circular economy and reclamation of anthropogenic deposits is essential to decouple economic growth from resource use. This study investigates filter dust from calcined clay production in Germany as such a deposit. The research compares raw material, untreated and calcined filter dust, and the industria...     »