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Title: Pore- and micro-structural characterization of a novel structural binder based on iron carbonation

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. - Highlights: • Carbonation of iron produces a dense microstructure. • Pore volume in iron carbonate lower, critical size higher than those in OPC pastes • Reaction productmore » contains iron, carbon, silicon, aluminum and calcium. • Power-law for porosity-moisture permeability relationship was established.« less
Authors:
 [1] ;  [2] ;  [3] ;  [1]
  1. School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ (United States)
  2. Iron Shell LLC, Tucson, AZ (United States)
  3. LeRoy Eyring Center for Solid State Science, Arizona State University, Tempe, AZ (United States)
Publication Date:
OSTI Identifier:
22403609
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 98; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; ALUMINIUM OXIDES; CALCIUM; CARBON; COMPRESSION STRENGTH; CONCRETES; ELECTRON MICROSCOPY; HARDNESS; IRON; IRON CARBONATES; MERCURY; PERMEABILITY; PLUTONIC ROCKS; PORE STRUCTURE; POROUS MATERIALS; PORTLAND CEMENT; POWDERS; SILICON; WATER VAPOR; WEAR RESISTANCE