Yield stress criteria to assess the buildability of 3D concrete printing
By Roshan Jayathilakage, P. Rajeev, J. Sanjayan. 2020
234 citations recorded by the source corpus.
Abstract 3D concrete printing (3DCP) using the extrusion method is a commonly used additive manufacturing technique to construct the structures layer by layer without using formwork. Therefore, the green (wet or fresh) strength of the printable concrete determines the possible printable height of the structure and the rate of printing to avoid collapse during the printing process. This paper aims to identify the buildability criteria based on the green strength of concrete and the effect of early age material properties on the stability of printed structures. The commonly available strength-based failure models based on the material yield stress and the vertical stresses induced were developed considering higher aspect ratios (height to width ratio). This may be not suitable for lower aspect ratios used in 3DCP layer geometries. Also, the frictional behaviour due to the applied vertical stresses should be considered in the material used for 3DCP applications. In this work, the Mohr-Coulomb based buildability criterion was developed and validated with laboratory experiments and numerical simulations. The laboratory experiments were carried out to establish the time-dependent material and rheological properties of 3D printable concrete mixes. Further, 3D printing of hollow circular sections was carried out to study the failure modes and to obtain the build height at the time of failure. The nonlinear finite difference model of the 3D printed sections was developed with the user-defined time-dependent material models to assess the accuracy of the proposed buildability criterion. Additionally, the proposed buildability criterion was further validated with the 3DCP experimental and numerical data presented in literature and all confirm that the proposed criterion shows higher accuracy over existing methods in assessing the buildability.
Subfields: Automotive Engineering, Building and Construction, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/050e88866b2bedfea5c200615831044e51c3d691
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Citations in the corpus
- A review of 3D printed concrete: Performance requirements, testing measurements and mix design (2020, background): “…by competing for the stepwise added layers and the development of mechanical behavior of materials with time during the printing process [45,60,61], that could be used to optimize the performance of fresh concrete. where, y is the shear yield stress, C is the cohesion, n is the acting…”
- 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].”