Triaxial compression testing on early age concrete for numerical analysis of 3D concrete printing
By R. Wolfs, Fred Bos, Tam Theo Salet. Cement & Concrete Composites, 2019
211 citations recorded by the source corpus.
Abstract In 3D concrete printing processes, two competing modes of failure are distinguished: material failure by plastic yielding, and elastic buckling failure through local or global instability. Structural analysis may be performed to assess if, and how, an object may fail during printing. This requires input in the form of transient material properties obtained from experimental testing on early age concrete. In this study, a custom triaxial compression test setup was developed, to characterize all essential parameters to assess failure by elastic buckling, and material yielding according to the Mohr-Coulomb criterion. The results of the triaxial tests were compared to simultaneously run unconfined uniaxial compression tests and ultrasonic wave transmission tests. The correlation between these experimental methods was reviewed. It was concluded that the triaxial compression test is an appropriate method to determine all relevant transient properties from one series of experiments. Subsequently, the experimental results were used for structural analyses of straight printed walls of different lengths with a Finite Element Modelling approach. These walls have been printed up to failure during print trials and the results were compared to the numerical predictions. The failure mode is predicted accurately by the numerical model, as is the critical height at which failure occurs for relatively small objects. For larger objects and/or longer printing processes, the quantitative agreement of the critical height with the print experiments could be improved. Two possible causes for this deviation are discussed.
Subfields: Automotive Engineering, Building and Construction, Civil and Structural Engineering
View Paper: https://www.semanticscholar.org/paper/98aef0b5fa937247013ff416999cfe1456cdfefd
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Citations in the corpus
- Improving printability of limestone-calcined clay-based cementitious materials by using viscosity-modifying admixture (2020, background): “In practice, many other factors may lead to elastic buckling failure via the local or global instability of the printed structure, for instance, the object geometry, and imperfect layer deposition [33].”
- A review of 3D printed concrete: Performance requirements, testing measurements and mix design (2020, methodology): “Further, in order to simplify the tests, a triaxial compression test setup was developed to obtain all essential parameters from uniaxial compressive strength and direct shear strength tests based on the Mohr-Coulomb criterion [60].”
- 3D printing eco-friendly concrete containing under-utilised and waste solids as aggregates (2021, unknown): “The construction process model for freshly mixed concrete materials can be explained to a certain extent by referring to the effective stress principle in soil mechanics [45,49].”
- Elastic buckling and plastic collapse during 3D concrete printing (2020, methodology): “after printing, typically is very low, in the order of 1 to 6, see [18] for more details.”