Optimization of pervious concrete containing fly ash and iron oxide nanoparticles and its application for phosphorus removal.
Authors: Vázquez-Rivera, Natalia I., Soto-Pérez, Linoshka, St John, Juliana N., Molina-Bas, Omar I., Hwang, Sangchul S.
Author Affiliations: Department of Civil Engineering and Surveying, University of Puerto Rico, Mayagüez, PR 00681, United States
Source: Construction & Building Materials. Sep2015, Vol. 93, p22-28. 7p.
Abstract: Response surface methodology by a two-level central composite design optimized the ratios of water-to-binder (W/B), fly ash-to-binder (FA/B) and iron oxide nanoparticles-to-binder (ENP/B) for Portland cement pervious concrete (PCPC). Compressive strength, permeability, void content and density ranged 2.5–13.5 MPa, 5.3–17.4 mm/s, 12–22% and 2120–2360 kg/m3 , respectively. W/B and FA/B had significant impacts on all the PCPC properties, whereas ENP/B produced significance only for the compressive strength. PCPC was optimized with 0.35 W/B, 0.15 FA/B and 0.05 ENP/B. The optimized PCPC exhibited enhanced phosphorus removal with the first-order removal constant at 0.031 h−1 and the Freundlich isotherm constant at 2.48 mg 1−1/ n kg−1 L 1/ n . [ABSTRACT FROM AUTHOR]
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