Monitoring micro-crack healing in an engineered cementitious composite using the environmental scanning electron microscope

Benny Suryanto, Jim Buckman, Pauline Thompson, Mohammed Bolbol, William John McCarter

Research output: Contribution to journalArticle

10 Citations (Scopus)
61 Downloads (Pure)

Abstract

Environmental Scanning Electron Microscopy (ESEM) is used to study the origin of micro-crack healing in an Engineered Cementitious Composite (ECC). ESEM images were acquired from ECC specimens cut from pre-cracked, dog-bone samples which then subjected to submerged curing followed by exposure to the natural environment. The mineralogical and chemical compositions of the healing products were determined using the EDX facility in the ESEM. It is shown that the precipitation of calcium carbonate is the main contributor to micro-crack healing at the crack mouth. The healing products initially appeared in an angular rhombohedral morphology which then underwent a discernable transformation in size, shape and surface texture, from relatively flat and smooth to irregular and rough, resembling the texture of the original surface areas surrounding the micro-cracks. It is also shown that exposure to the natural environment, involving intermittent wetting/drying cycles, promotes additional crystal growth, which indicates enhanced self-healing capability in this environment.
Original languageEnglish
Pages (from-to)175–185
Number of pages11
JournalMaterials Characterization
Volume119
Early online date27 Jul 2016
DOIs
Publication statusPublished - Sep 2016

Keywords

  • Calcite
  • ECC
  • EDX
  • ESEM
  • Micro-cracks
  • Self-healing
  • Wet/dry cycles

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