Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 93, Issue -, Pages 22-28Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2015.05.110
Keywords
Compressive strength; Permeability; Phosphorus; Response surface methodology; Void content
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Funding
- AES Puerto Rico, LLC
- National Science Foundation [DMR-0934115]
- Puerto Rico NASA Space Grant Scholarship
- Office of Integrative Activities
- Office Of The Director [1002410] Funding Source: National Science Foundation
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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, 53-17.4 mm/s, 12-22% and 2120-2360 kg/m(3), 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. (C) 2015 Elsevier Ltd. All rights reserved.
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