Cement Production - an overview | ScienceDirect Topics
The functional unit is the production of 1 kg of Portland cement strength class 42.5 (CEM I 42.5 R). Average fuel for clinker production is composed of 6.81 × 10 ‒3 MJ natural gas (high pressure), 3.74 × 10 ‒4 kg light fuel oil, 2.55 × 10 ‒2 kg heavy fuel oil, 3.54 × 10 ‒2 kg hard coal and 3.91 × 10 ‒3 kg