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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
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Mastering Yield Stress Evolution and Formwork Friction for Smart Dynamic Casting.

Anna Szabo1,2, Lex Reiter2, Ena Lloret-Fritschi1,2

  • 1Institute of Technology in Architecture, ETH Zurich, Stefano-Franscini-Platz 1, 8093 Zürich, Switzerland.

Materials (Basel, Switzerland)
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Summary
This summary is machine-generated.

Smart dynamic casting (SDC) optimizes concrete slip-forming for complex structures. Research links material properties and friction to a new

Keywords:
SDC numberacceleratorprocess windowset on demandsmart dynamic casting

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Area of Science:

  • Construction Technology
  • Materials Science
  • Digital Fabrication

Background:

  • The construction industry traditionally lags in adopting new technologies.
  • Digital fabrication methods offer potential for faster, higher-quality construction with greater design freedom.
  • Smart dynamic casting (SDC) is a digital slip-forming process with potential for advanced construction.

Purpose of the Study:

  • To investigate the potential and constraints of smart dynamic casting (SDC) for producing thin folded concrete structures.
  • To establish a material-focused approach for optimizing SDC processes.
  • To develop a theoretical framework linking material properties, process conditions, and geometry for SDC.

Main Methods:

  • Studied workability and strength evolution of various concrete compositions for consistent SDC processing rates.
  • Investigated concrete-formwork friction using a simplified experimental setup.
  • Developed a theoretical framework, introducing the 'SDC number,' to define the process window for slip-forming.

Main Results:

  • Experimental results confirmed friction is proportional to yield stress, irrespective of base composition or acceleration method.
  • Identified initial friction as highest, suggesting easier continuation after successful startup.
  • Demonstrated the necessity of consistent strength evolution for narrow process windows, like those for thin folded structures.

Conclusions:

  • The developed theoretical framework and 'SDC number' provide a simplified approach to formulating the SDC process window.
  • Material properties significantly influence SDC success, particularly for complex geometries like thin folded structures.
  • The findings enable material and geometry-specific strategies for optimizing SDC start times and slipping rates in production.