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Economic and environmental evaluation and optimum ratio of natural aggregate and recycled aggregate production

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Document pages: 10 pages

Abstract: The costs of overexploitation of quarries, generation of construction and demolition waste, and preparation of additional landfill space have steadily increased and have become challenges to the metropolitan environment and waste management. In this paper, aggregate production is divided into two cases: scenario 1 represents natural aggregate production (NA) and scenario 2 represents recycled aggregate production (RA). This study consists of two parts. In the first part, the objective is to conduct environmental assessment (energy consumption and CO2 emission) and economic (cost) assessment for these two scenarios through the life cycle assessment (LCA) method. In the second part, the results of the first part are used to estimate the optimal production combination of sodium and radium, andhereby find an optimal solution (scenario) for a more eco-friendly aggregate production. The defined formulas and relationship are used to develop a model. The results of model validation show that the optimal ratio, in optimal scenario, is 50 . The results show that, compared to scenario 1, optimal scenario improves the energy consumption, CO2 emissions, and production cost by, respectively, 30 , 36 , and 31 , which demonstrate the effectiveness of this optimization.

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