36 Citations (Scopus)

Abstract

Microstructural and micromechanical investigation of a fly ash-based geopolymer using: (i) synchrotron X-ray tomography (XRT) to determine the volume fraction and tortuosity of pores that are influential in fluid transport, (ii) mercury intrusion porosimetry (MIP) to capture the volume fraction of smaller pores, (iii) scanning electron microscopy (SEM) combined with multi-label thresholding to identify and characterize the solid phases in the microstructure, and (iv) nanoindentation to determine the component phase elastic properties using statistical deconvolution, is reported in this paper. The phase volume fractions and elastic properties are used in multi-step mean field homogenization (Mori-Tanaka and double inclusion) models to determine the homogenized macroscale elastic modulus of the composite. The homogenized elastic moduli are in good agreement with the flexural elastic modulus determined on macroscale paste beams. The combined use of microstructural and micromechanical characterization tools at multiple scales provides valuable information towards the material design of fly ash geopolymers.

Original languageEnglish (US)
Pages (from-to)252-262
Number of pages11
JournalCement and Concrete Research
Volume78
DOIs
StatePublished - Apr 9 2015

Fingerprint

Coal Ash
Geopolymers
Nanoindentation
Synchrotrons
Fly ash
Tomography
Volume fraction
Elastic moduli
X rays
Deconvolution
Ointments
Mercury
Labels
Microstructure
Scanning electron microscopy
Fluids
Composite materials

Keywords

  • Alkali activated cement (D)
  • Backscattered electron imaging (B)
  • Fly ash (D)
  • Micromechanics (C)
  • X-ray tomography

ASJC Scopus subject areas

  • Materials Science(all)
  • Building and Construction

Cite this

Effective properties of a fly ash geopolymer : Synergistic application of X-ray synchrotron tomography, nanoindentation, and homogenization models. / Das, Sumanta; Yang, Pu; Singh, Sudhanshu S.; Mertens, James C E; Xiao, Xianghui; Chawla, Nikhilesh; Neithalath, Narayanan.

In: Cement and Concrete Research, Vol. 78, 09.04.2015, p. 252-262.

Research output: Contribution to journalArticle

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AU - Mertens, James C E

AU - Xiao, Xianghui

AU - Chawla, Nikhilesh

AU - Neithalath, Narayanan

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