Integration of biochar into the C-LWA before using them in concrete has important advantages compared to a direct addition of biochar into concrete. Contrary to biochar as-delivered, the use of LWA is a well-grounded practice by many concrete producers and contractors. The use of C-LWA in concrete mixing eliminates the risk associated with high dusting, ignition, excessive use of superplasticizers, etc. Finally, replacement of the virgin normal-weight aggregates with the synthetic aggregates can further contribute to the improved sustainability of concrete, in particular in regions where the aggregate sources are scarce .