Adapting Smart Dynamic Casting to Thin Folded Geometries

Szabó, Anna; Reiter, Lex; Lloret-Fritschi, Ena; Gramazio, Fabio; Köhler, Matthias; Flatt, Robert J.

doi:10.1007/978-3-319-99519-9_8

Cited by 15 publications

(22 citation statements)

References 11 publications

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“…In this paper, two different retarded base mix formulations were tested for ACDC: an UHPC (noted 'mix U') with a mix design based on [10] and a self-compacting mortar (noted 'mix S') adjusted from previous SDC formulations [9,11]. 'U' comprises 0.1-0.4mm silica sand, a CEM I 52,5N Portland cement, silica fume, two types of limestone fillers while 'S' contains 0-4mm siliceous sand aggregates, a CEM I 52.5R Portland cement and silica fume.…”

Section: Methodsmentioning

confidence: 99%

ACDC: The Admixture Controlled Digital Casting and Its Application to Thin Folded Concrete Structures

Szabó¹,

Reiter²,

Lloret-Fritschi³

et al. 2020

RILEM Bookseries

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Digital concrete technologies aim to minimize or eliminate the need for formwork, produce less waste, and build material efficient designs at increased productivity. This paper discusses how Admixture Controlled Digital Casting (ACDC) could address these aims by producing thin folded structures. For the process, a set on demand concrete composition was used to achieve minimal deformations when robotically filling weakly supported formworks. The formworks were constructed from bendable materials such as foil, geotextile or paper tensed between a frame on top and bottom and could be reconfigured for different geometries. The prototypes were assembled and post-tensioned to achieve a one-to-one scale fully functional architectural roof element. With the demonstrator presented, ACDC challenges the way we think about casting and formworks in the construction industry at the age of the 4 th industrial revolution.

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Section: Methodsmentioning

confidence: 99%

ACDC: The Admixture Controlled Digital Casting and Its Application to Thin Folded Concrete Structures

Szabó¹,

Reiter²,

Lloret-Fritschi³

et al. 2020

RILEM Bookseries

Self Cite

View full text Add to dashboard Cite

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“…Due to the downscaling, hydration control is required, and is performed by the use of chemical admixtures. The system is suited to produce columnar elements of variable cross section through the use of a digitally actuated, deformable formwork [40], although it has also been demonstrated to be used to produce thin folded structures that are more buckling resistant [41]. A similar approach has been taken to produce a large series of twisted columnar elements, with the intent of using these in a variable shading façade [42].…”

Section: Slipformingmentioning

confidence: 99%

Digital Concrete: A Review

Wangler

Roussel

Bos

et al. 2019

Cement and Concrete Research

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135

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“…Shaping concrete in SDC requires that the concrete sets on demand and builds up strength during the robotic experiments at an expected rate based on previously conducted measurements [11,17]. First, a large retarded batch is prepared that is suitable for pumping and has a long enough open time for the whole duration of the process [17,18].…”

Section: Figurementioning

confidence: 99%

“…In SDC, a small formwork with a maximum height of 40 cm is used to produce one-to-one scale architectural elements such as columns, mullions and folded structures [9]. The formwork is moved along a predefined path using a 6-axis robotic arm [9][10][11][12] or a linear axis [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Mastering Yield Stress Evolution and Formwork Friction for Smart Dynamic Casting

et al. 2020

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The construction industry is a slow adopter of new technologies and materials. However, interdisciplinary research efforts in digital fabrication methods with concrete aim to make a real impact on the way we build by showing faster production, higher quality and enlarged freedom of design. In this paper, the potential and constraints of a specific digital slip-forming process, smart dynamic casting (SDC), are investigated with a material-focused approach in the complex task of producing thin folded structures. Firstly, the workability and the strength evolution of different material compositions are studied to achieve the constant processing rate for SDC. Secondly, friction between the formwork walls and the concrete, a key aspect in slip-casting, is studied with a simplified experimental setup to identify if any of these mixes would provide an advantage for processing. Finally, a theoretical framework is constructed to link the material properties, the process conditions and the designed geometry. This framework introduces the ‘SDC number’ as a simplified approach to formulate the process window, the suitable conditions for slip-forming. The experimental results prove the assumption of the model that friction is proportional to yield stress for all base compositions and acceleration methods regardless of the filling history. The results are evaluated in the context of the narrow process window of thin folded structures as well as the wider process window of columns. The necessity of consistent strength evolution is underlined for narrow windows. Further, friction is shown to be the highest initially, thus with both narrow and wide process windows, after a successful start-up the continuation of slipping is less prone to failure. The proposed theoretical model could provide material and geometry-specific slipping strategy for start time and slipping rate during production.

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Adapting Smart Dynamic Casting to Thin Folded Geometries

Cited by 15 publications

References 11 publications

ACDC: The Admixture Controlled Digital Casting and Its Application to Thin Folded Concrete Structures

ACDC: The Admixture Controlled Digital Casting and Its Application to Thin Folded Concrete Structures

Digital Concrete: A Review

Mastering Yield Stress Evolution and Formwork Friction for Smart Dynamic Casting

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