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

Sumanta Das, David Stone, Diana Convey, Narayanan Neithalath

Research output: Contribution to journalArticle

17 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)168-179
Number of pages12
JournalMaterials Characterization
Volume98
DOIs
StatePublished - Dec 2014

Keywords

  • Carbonation
  • Diffusivity
  • Iron powder
  • Microstructure
  • Permeability
  • Porosity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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