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Natural pozzolan as hydraulic binder substitution in combination with recycled aggregates in concrete. S. Kenai, ... J. Khatib, in Advance Upcycling of By-Products in Binder and Binder-Based Materials, 2024 5.6 Environmental and economical aspects. Cement manufacture is an energy-intensive process. For every ton of cement produced, there is up to 1 ton of …