Preprint Article Version 1 This version is not peer-reviewed

Practice-Oriented Buildability Criteria for Developing 3D-Printable Concretes in the Context of Digital Construction

Version 1 : Received: 24 August 2018 / Approved: 27 August 2018 / Online: 27 August 2018 (06:37:13 CEST)

A peer-reviewed article of this Preprint also exists.

Journal reference: Automation in Construction 2019, 109
DOI: 10.1016/j.autcon.2019.102986

Abstract

Buildability, i.e. the ability of a deposited material bulk to retain its dimmensions under increasing load, is an inherent prerequisite for formwork-free digital construction (DC). Since DC processes are relatively new, no standard methods of characterization are available yet. The paper at hand presents practice-oriented buildabilty criteria by taking various process parameters and construction costs into consideration. In doing so, direct links between laboratory buildability tests and target applications are established. A systematic basis for calculating the time interval (TI) to be followed during laboratory testing is proposed for the full-width printing (FWP) and filament printing (FP) processes. The proposed approach is validated by applying it to a high-strength, printable, fine-grained concrete. Comparative analyses of FWP and FP revealed that to test the buildability of a material for FP processes, higher velocities of the printhead should be established for laboratory tests in comparison to those needed for FWP process, providing for equal construction rates.

Subject Areas

digital construction; 3D-concrete-printing; buildabiltiy; additive manufacturing

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