Economic and Environmental Evaluation and Optimal Ratio of Natural and Recycled Aggregate Production

Table 1

Scenarios, phases, and used conversion factors of the study.

#	Phases	Energy source	Final to primary energy factor	CO2 emission factor
Scenario  1	Step  1 = extraction & mining	Diesel	0.086	3.032
	Step  2 = crushing & screening	Electricity	0.29	1.2
Scenario  2	Step  1 = precrushing	Diesel	0.086	3.032
	Step  2 = crushing & screening	Electricity	0.29	1.2