Examining Effect of Printing Directionality on Freezing-and-Thawing Response of Three-Dimensional-Printed Cement Paste

Rita Maria Ghantous, Anastasiia Evseeva, Brandon Dickey, Shashank Gupta, Arjun Prihar, Hadi Shagerdi Esmaeeli, Reza Moini, W. Jason Weiss

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The use of three-dimensional (3-D) printing with cementitious materials is increasing in the construction industry. Limited information exists on the freezing-and-thawing (FT) performance of the 3-D-printed elements. A few studies have used standard FT testing procedures (ASTM C666) to assess the FT response; however, ASTM C666 is insensitive to anisotropy caused by printing directionality. This paper investigates the FT response of 3-D-printed cement paste elements using thermomechanical analysis (TMA) to examine the influence of directionality in comparison to cast counterparts. Cement paste with a water-cement ratio (w/c) of 0.275 was used. The critical degree of saturation (DOSCR) as well as the coefficient of thermal expansion (COTE) were determined for specimens with varying degrees of saturation (DOS). Micro-computed tomography (micro-CT) was conducted to quantitatively understand the heterogeneities in the pore microstructure of 3-D-printed materials. For the specimens fabricated in this study, the COTE and DOSCR are independent of the 3-D-printing directionality and were comparable to conventionally cast specimens. For samples at 100% saturation, the FT damage was higher in the 3-D-printed samples as compared to the cast samples. The use of a low w/c in the 3-D-printed materials, desired from a buildability perspective, led to low capillary porosity, which thus decreased the amount of freezable pore solution and increased the FT resistance of the 3-D-printed materials. Micro-CT analysis demonstrated a significant 4.6 times higher average porosity in the interfacial regions compared to the filament cores.

Original languageEnglish (US)
Pages (from-to)89-102
Number of pages14
JournalACI Materials Journal
Volume120
Issue number4
DOIs
StatePublished - Jul 2023
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science

Keywords

  • anisotropy
  • coefficient of thermal expansion (COTE)
  • freezable solution
  • freezing-and-thawing (FT) performance
  • three-dimensional (3-D)-printed cement paste

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