Microstructure characterization of cement paste from micro-CT and correlations with mechanical properties evaluated from virtual and real experiments

Ji Su Kim, Jong Hak Kim, Tongseok Han

Research output: Contribution to journalArticle

Abstract

As micro-CT devices have become widely available, the detailed 3D microstructures of cementitious materials can be more conveniently investigated. However, owing to the resolution required to appropriately represent the cement-paste microstructures, the domain size of the micro-CT sample is limited. By synergistically combining the virtual and real experiments, correlations between the microstructural characteristics and properties of cement paste with various w/c ratios (0.3, 0.4, 0.5, and 0.6) are investigated at different length scales. The porosity from the micro-CT images are correlated with the macro-scale properties obtained from real experiments. At the micro-scale, the homogenized solid phase properties are characterized from the linear attenuation coefficient (LAC) value distribution characteristic of the micro-CT images and are correlated with the modeling parameters of the phase field fracture. According to the results of virtual experiments conducted using the phase field fracture model and the characterization methods, the mechanical properties (stiffness/strength) at the micro- and macro-scale exhibited apparent relationships.

Original languageEnglish
Article number109807
JournalMaterials Characterization
Volume155
DOIs
Publication statusPublished - 2019 Sep 1

Fingerprint

cements
Ointments
Cements
mechanical properties
Mechanical properties
microstructure
Microstructure
Macros
Experiments
Porosity
Stiffness
attenuation coefficients
solid phases
stiffness
porosity

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "As micro-CT devices have become widely available, the detailed 3D microstructures of cementitious materials can be more conveniently investigated. However, owing to the resolution required to appropriately represent the cement-paste microstructures, the domain size of the micro-CT sample is limited. By synergistically combining the virtual and real experiments, correlations between the microstructural characteristics and properties of cement paste with various w/c ratios (0.3, 0.4, 0.5, and 0.6) are investigated at different length scales. The porosity from the micro-CT images are correlated with the macro-scale properties obtained from real experiments. At the micro-scale, the homogenized solid phase properties are characterized from the linear attenuation coefficient (LAC) value distribution characteristic of the micro-CT images and are correlated with the modeling parameters of the phase field fracture. According to the results of virtual experiments conducted using the phase field fracture model and the characterization methods, the mechanical properties (stiffness/strength) at the micro- and macro-scale exhibited apparent relationships.",
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