Abstract

The fracture response of cementitious composites containing compliant microencapsulated inclusions and its influence on the fracture process zone (FPZ) are reported. The incorporation of small amounts of phase change material (PCM) microcapsules (replacing up to 10% by volume of sand) is found to slightly improve the strength, fracture toughness, critical crack tip opening displacement (CTODc), and the strain energy release rates. Digital image correlation is used to examine the FPZ at the tip of the advancing crack, to better explain the influences of compliant microscale inclusions on energy dissipation. The FPZ widths are found to slightly increase with PCM dosage but its lengths remain unchanged. The increase in FPZ width is linearly related to the CTODc, showing that inelastic deformations of the crack-tip in the direction of crack opening are indeed influenced by microscale inclusions. It is shown that cementitious systems containing microencapsulated PCMs can be designed to demonstrate mechanical performance (including fracture) equivalent to or even better than their PCM-free counterparts, in addition to the well-described thermal performance.

Original languageEnglish (US)
Pages (from-to)13-23
Number of pages11
JournalCement and Concrete Composites
Volume94
DOIs
StatePublished - Nov 1 2018

Fingerprint

Phase change materials
Composite materials
Crack tips
Cracks
Pulse code modulation
Energy release rate
Strain energy
Capsules
Fracture toughness
Energy dissipation
Sand

Keywords

  • Digital image correlation
  • Finite element analysis
  • Fracture process zone
  • Fracture toughness
  • Inclusions

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

Cite this

Elucidating the influences of compliant microscale inclusions on the fracture behavior of cementitious composites. / Das, Sumanta; Aguayo, Matthew; Kabay, Nihat; Mobasher, Barzin; Sant, Gaurav; Neithalath, Narayanan.

In: Cement and Concrete Composites, Vol. 94, 01.11.2018, p. 13-23.

Research output: Contribution to journalArticle

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AU - Neithalath, Narayanan

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