Pre-installed Reinforcement for 3D Concrete Printing
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Author / Producer
Date
2022
Publication Type
Conference Paper
ETH Bibliography
yes
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Abstract
Providing reinforcement is essential for the structural integrity of concrete elements and for safely handling, transporting, and assembling prefabricated concrete parts. However, the integration of reinforcement is a persisting challenge in 3D concrete printing with extruded concrete. This paper presents a production process consisting of 3D printing around pre-installed reinforcement. The reinforcement is composed of conventional reinforcing steel bars, which can be pre-assembled in cages independently of casting, boosting the specialisation and efficiency in production. This approach was used to produce a 3.4 m span T-beam with optimised topology, consisting of three segments connected with matching surfaces. The beam segments were printed upside down, with an open web on top of the flange. Each segment featured reinforcing steel installed in the flange and web. After printing and assembling the segments, a conventional reinforcing bar was inserted in the web as bending reinforcement and grouted subsequently. The structural performance was assessed in a six-point bending test. The fabrication and structural testing of this case study beam showed that pre-installed reinforcement imposes several challenges to the extruder precision, the precision of the bent reinforcement, and – if applied – the casting after printing.
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Publication status
published
External links
Book title
Third RILEM International Conference on Concrete and Digital Fabrication
Journal / series
Volume
37
Pages / Article No.
430 - 435
Publisher
Springer
Event
3rd RILEM International Conference on Concrete and Digital Fabrication (Digital Concrete 2022)
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Digital fabrication with concrete; 3D concrete printing; reinforcement strategies; structural testing; pre-installed reinforcement
Organisational unit
09469 - Kaufmann, Walter / Kaufmann, Walter
09566 - Dillenburger, Benjamin / Dillenburger, Benjamin
02284 - NFS Digitale Fabrikation / NCCR Digital Fabrication
Notes
Conference lecture held on June 28, 2022
Funding
141853 - Digital Fabrication - Advanced Building Processes in Architecture (SNF)