3D Printing and Digital Technologies in Concrete

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Civil Engineering".

Deadline for manuscript submissions: closed (20 April 2023) | Viewed by 2263

Special Issue Editors


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Guest Editor
Department of Civil Engineering, Stellenbosch University, Stellenbosch 7600, South Africa
Interests: 3D concrete printing; rheology; nanomaterials; analytical modeling; concrete material technology; construction materials; mechanics; thixotropy; advanced materials; reinforced concrete; additive manufacturing; structural engineering; fire safety engineering

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Guest Editor
Department of Civil Engineering, Stellenbosch University, Stellenbosch 7600, South Africa
Interests: finite element method; concrete; structural engineering; concrete technologies; construction materials; corrosion; civil engineering; finite element analysis; composites; cement
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Special Issue Information

Dear Colleagues,

Digital technologies in concrete, such as additive extrusion, shotcrete and particle-bed-based 3D printing, as well as subtractive manufacturing including milling, are rapidly penetrating the built environment industry, both in practice and academia, promising significant time, cost and environmental benefits through the digital transformation of construction processes.

In light of this, this Special Issue is dedicated to presenting the state-of-the-art in 3D printing and digital technologies in concrete, publishing high-quality original research papers within the following subfields:

  • Sustainable materials;
  • Microstructure characterisation;
  • Fresh state behaviour;
  • Reinforcement strategies;
  • Technological developments;
  • Durability investigations;
  • Structural engineering;
  • Hardened state behaviour;
  • Mechanical performance;
  • Numerical modelling strategies;
  • Quality control processes;
  • Software advancements.

We welcome all contributions and especially encourage fresh perspectives from our industry community to facilitate industry–academia collaboration, communication and synchronisation.

Dr. Jacques Kruger
Prof. Dr. Gideon van Zijl
Guest Editors

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Keywords

  • 3D concrete printing
  • concrete and digital fabrication
  • digital technologies in concrete
  • digital transformation in construction
  • additive and subtractive manufacturing in construction

Published Papers (1 paper)

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Research

16 pages, 6813 KiB  
Article
Investigating the Poisson Ratio of 3D Printed Concrete
by Jacques Kruger and Jean-Pierré van der Westhuizen
Appl. Sci. 2023, 13(5), 3225; https://doi.org/10.3390/app13053225 - 02 Mar 2023
Cited by 4 | Viewed by 1868
Abstract
Poisson’s ratio, defining the lateral to longitudinal strain of a material under uniaxial load, is an extensively used material property in engineering analysis and design. For conventionally cast concrete, an isotropic static Poisson ratio typically ranges between 0.15 to 0.25. However, no ratio [...] Read more.
Poisson’s ratio, defining the lateral to longitudinal strain of a material under uniaxial load, is an extensively used material property in engineering analysis and design. For conventionally cast concrete, an isotropic static Poisson ratio typically ranges between 0.15 to 0.25. However, no ratio has been established for 3D printed concrete, and is currently widely assumed to be 0.2 and isotropic in computational modelling applications. This layer-wise additive manufacturing technology is notorious for yielding orthotropic mechanical properties due to the presence of weak interlayer regions at the structural level and elongated oblate voids at the material level. This study therefore aims to characterise the static Poisson ratio of printed concrete. Specimens were prepared from a printed element and uniaxially tested both parallel and perpendicular to the printing direction. Digital image correlation technology was employed to facilitate the capturing of specimen strains, followed by micro-computed tomography scans to determine void topography. The results indicate larger Poisson ratios apply for 3D printed concrete compared to its cast counterpart; up to 17 and 33% increases were obtained when printed specimens were tested perpendicular and parallel to the printing direction, respectively. This orthotropic behaviour is ascribed to the oblate voids present in the printed specimens. Full article
(This article belongs to the Special Issue 3D Printing and Digital Technologies in Concrete)
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