Control of Strand Properties Produced with Shotcrete 3D Printing by Accelerator Dosage and Process Parameters

Inka Dressler, Niklas Freund, Dirk Lowke

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

10 Scopus citations

Abstract

Shotcrete 3D Printing (SC3DP) has recently evolved as a large-scale additive manufacturing technique. The major advantage of this technique is the high manufacturing speed for creating large-sized monolithic structures. However, to control this technique properly, the combined effects of process parameters and rheological properties of the concrete need to be fully understood. Therefore, the effect of accelerator dosage (0%, 2%, 4%, 6%) on the material’s yield stress is quantified with a penetrometer up to 90 min after deposition. The vertical deformation of strands is also found to correlate with yield stress. Moreover, the resulting geometry of the strands is analyzed. Here, an increase in strand height and a decrease in strand width is determined with increasing accelerator dosage. Among other factors, this is deduced to the opening angle when material leaves the nozzle. To compensate unwanted changes in geometry due to accelerator, process parameters to modify the geometry are studied as well. Therefore, the effect of traverse speed, nozzle-to-strand-distance and volume air flow on the geometry is quantified. Finally, the possibilities to use the findings of the effect of accelerator dosage and process parameters during printing process purposefully are discussed.

Original languageEnglish
Title of host publicationRILEM Bookseries
PublisherSpringer
Pages42-52
Number of pages11
DOIs
StatePublished - 2020
Externally publishedYes

Publication series

NameRILEM Bookseries
Volume28
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852

Keywords

  • Accelerator
  • Admixtures
  • Process parameters
  • Shotcrete 3D printing
  • Strand geometry

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