@article{2ec022470ac34db3bbf255b9d5f0b907,
title = "Fracture and transport analysis of heterogeneous 3D-Printed lamellar cementitious materials",
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.",
keywords = "Concrete 3D-printing, Fracture toughness, Laser notching, Materials architecture, Transport",
author = "Shashank Gupta and Esmaeeli, {Hadi S.} and Arjun Prihar and Ghantous, {Rita M.} and Weiss, {W. Jason} and Reza Moini",
note = "Funding Information: The team would like to thank the National Science Foundation for the generous support of this collaborative research (CMMI 2129566, 2129606), particularly the Engineering for Civil Infrastructure Program. We would like to thank the Department of Civil and Environmental Engineering at Princeton University for providing access to a CO2 laser cutter and engraver machine. In addition, we would like to thank the image and analysis center (IAC) at Princeton University and the neutron radiography facility of the Oregon State TRIGA{\textregistered} Reactor (OSTR) for the equipment. We also would like to thank the BASF chemicals company for providing the chemical admixtures and Buzzi Unicem for providing the cement. Funding Information: The team would like to thank the National Science Foundation for the generous support of this collaborative research (CMMI 2129566, 2129606), particularly the Engineering for Civil Infrastructure Program. We would like to thank the Department of Civil and Environmental Engineering at Princeton University for providing access to a CO 2 laser cutter and engraver machine. In addition, we would like to thank the image and analysis center (IAC) at Princeton University and the neutron radiography facility of the Oregon State TRIGA{\textregistered} Reactor (OSTR) for the equipment. We also would like to thank the BASF chemicals company for providing the chemical admixtures and Buzzi Unicem for providing the cement. Publisher Copyright: {\textcopyright} 2023 The Authors",
year = "2023",
month = jul,
doi = "10.1016/j.cemconcomp.2023.105034",
language = "English (US)",
volume = "140",
journal = "Cement and Concrete Composites",
issn = "0958-9465",
publisher = "Elsevier Limited",
}