Fracture and transport analysis of heterogeneous 3D-Printed lamellar cementitious materials

Shashank Gupta, Hadi S. Esmaeeli, Arjun Prihar, Rita M. Ghantous, W. Jason Weiss, Reza Moini

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This paper investigates the spatial characteristics of microstructural phases in relation to the fracture toughness in Mode-I/II and transport behavior in two orthogonal directions of lamellar 3D-printed cement paste compared to cast counterparts. Using segmentation techniques, it was found that intact 3D-printed materials represent porous interfaces and microchannels. A modified partial-notch Brazil-Nut test was proposed to characterize the Mode-I/II fracture toughness. A new laser-notching process was proposed to generate a sharp notch and account for the sensitivity of fracture processes to microstructural heterogeneities in 3D-printed materials. Unlike Mode-I, significantly higher Mode-II fracture toughness was found in 3D-printed material in the perpendicular direction compared to the cast, owing to the in/out-of-plane crack deflection along the interfaces. The porous interfacial regions were hypothesized to govern the crack initiation in both Mode-I/II. Water transport was characterized by absorption using Neutron Radiography, where interfacial heterogeneities act as capillary breaks, hence directionally influences water absorption and transport.

Original languageEnglish (US)
Article number105034
JournalCement and Concrete Composites
Volume140
DOIs
StatePublished - Jul 2023

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • General Materials Science

Keywords

  • Concrete 3D-printing
  • Fracture toughness
  • Laser notching
  • Materials architecture
  • Transport

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