Issues on characterization of cement paste microstructures from μ-CT and virtual experiment framework for evaluating mechanical properties

Ji Su Kim, Sang Yeop Chung, Dietmar Stephan, Tong Seok Han

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

There are issues on the microstructure characterization of cement paste obtained from μ-CT due to resolution limits, and evaluation of properties through virtual experiments. A phase separation procedure between the solid and pore phases, which can be used for pure cement paste microstructures, is proposed. The problems of underestimation of microstructural characteristics such as porosity in virtual specimens from μ-CT, as compared to real specimens, are addressed. Reflecting such underestimation, the process of input modeling parameter determination for virtual experiments on mechanical property evaluation using the phase field fracture model is elaborated. Through virtual tests, the effects of domain size and mesh resolution on the evaluated properties are investigated, and the correlation between the microstructural characterization parameters and mechanical properties is reconfirmed. It is shown that the virtual experiment framework proposed in this study can be used as a loading tool to supplement time and effort consuming real experiments for evaluating the mechanical properties of cement paste at the micro-scale.

Original languageEnglish
Pages (from-to)82-102
Number of pages21
JournalConstruction and Building Materials
Volume202
DOIs
Publication statusPublished - 2019 Mar 30

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation Grant , funded by the Korean Government and the German Federal Ministry of Education for KONNECT Joint Call project (NRF-2015K1A3A1A59073929/BMBF Project number: 01DR16007). This research was also supported by grants from the Korea Research Foundation ( NRF-2016R1D1A1B03931635 ) and supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20174030201480 ). Parallel computation in this work was supported by the PLSI supercomputing resources of the Korea Institute of Science and Technology Information and the resources of the UNIST Supercomputing Center. -CT images were obtained from the synchrotron operated by the Pohang Accelerator Laboratory (PAL) in Korea.

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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