Pore- and micro-structural characterization of a novel structural binder based on iron carbonation |
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| Affiliation: | 1. School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, USA;2. Iron Shell LLC, Tucson, AZ, USA;3. LeRoy Eyring Center for Solid State Science, Arizona State University, Tempe, AZ, USA;4. School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, USA;1. Department of Applied Mathematics, University of Leeds, LeedsLS2 9JT, UK;2. Mathematics Section, School of Distance Education, Universiti Sains Malaysia, 11800Penang, Malaysia;3. Department of Mathematics, Babeş-Bolyai University, R-400084Cluj-Napoca, Romania;1. College of Materials Science and Engineering, Fuzhou University, Fujian 350108, China;2. Faculty of Materials Science and Energy, Southwest University, Chongqing 400715, China;3. Department of Automotive Engineering, Clemson University, Greenville, SC 29607, USA;1. Empa, Laboratory for Concrete & Construction Chemistry, Überlandstrasse 129, 8600 Dübendorf, Switzerland;2. Paul Scherrer Institute, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland;3. Ecole Polytechnique Federal de Lausanne (EPFL), Laboratory for Construction Materials, 1015 Lausanne, Switzerland;1. School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, USA;2. Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, USA;3. California Nanosystems Institute (CNSI), University of California, Los Angeles, CA, USA;1. Empa, Laboratory for Concrete & Construction Chemistry, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland;2. Clermont Université, ENSCCF, Institut de Chimie de Clermont-Ferrand, BP 10448, F-63000 Clermont-Ferrand, France;3. CNRS, UMR 6296, ICCF, F-63171 Aubière, France;4. Paul Scherrer Institute, Nuclear Energy and Safety Department, Laboratory for Waste Management, 5232 Villigen PSI, Switzerland |
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| Abstract: | The pore- and micro-structural features of a novel binding material based on the carbonation of waste metallic iron powder are reported in this paper. The binder contains metallic iron powder as the major ingredient, followed by additives containing silica and alumina to facilitate favorable reaction product formation. Compressive strengths sufficient for a majority of concrete applications are attained. The material pore structure is investigated primarily through mercury intrusion porosimetry whereas electron microscopy is used for microstructural characterization. Reduction in the overall porosity and the average pore size with an increase in carbonation duration from 1 day to 4 days is noticed. The pore structure features are used in predictive models for gas and moisture transport (water vapor diffusivity and moisture permeability) through the porous medium which dictates its long-term durability when used in structural applications. Comparisons of the pore structure with those of a Portland cement paste are also provided. The morphology of the reaction products in the iron-based binder, and the distribution of constituent elements in the microstructure are also reported. |
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