Slow penetration for characterizing concrete for digital fabrication
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Date
2022-07
Publication Type
Journal Article
ETH Bibliography
yes
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Abstract
Digital fabrication processes with concrete require a specific yield stress evolution after placing. This paper shows that this goal can be achieved with displacement controlled continuous slow penetration methods, and gives a model understanding and specific suggestions for measurement. It is found that the force recorded in continuous and point-wise penetration tests with a conical tool moving at a slow rate scales linearly and over multiple decades with independent measurements of yield stress carried out using uniaxial compression and vane test. A model adapted from soil-mechanical stability predicts the bearing capacity factor that relates the penetration force to yield stress. The experimental value agrees with the predicted one for an undrained/plastic material. The measurements indicate a yield stress validity range of 1–200 kPa and as low as 0.1 kPa with consideration of depth dependency. This range is the one of greatest interest for structural build-up in digital fabrication during production.
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Publication status
published
Editor
Book title
Journal / series
Volume
157
Pages / Article No.
106802
Publisher
Elsevier
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Penetration; Yield stress; Structural build-up; Thixotropy
Organisational unit
03891 - Flatt, Robert J. / Flatt, Robert J.
02284 - NFS Digitale Fabrikation / NCCR Digital Fabrication
Notes
Funding
141853 - Digital Fabrication - Advanced Building Processes in Architecture (SNF)