Effects of interlocking on interlayer adhesion and strength of structures in 3D printing of concrete

Zareiyan, Babak; Khoshnevis, Behrokh

doi:10.1016/j.autcon.2017.08.019

Cited by 227 publications

(71 citation statements)

References 29 publications

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“…Other study such as Wolfs et al, Hosseini et al and Marchment et al focused on the bond between layers [38][39][40][41]. As previously reported in the literature, the interlayer adhesion between two printed layers is time sensitive [38].…”

Section: State Of the Art And Research Objectivesmentioning

confidence: 93%

Experimental Approach for Printability Assessment: Toward a Practical Decision-Making Framework of Printability for Cementitious Materials

et al. 2019

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The objective of this paper is to propose a pre-experimental framework of printability pre-assessment of cementitious materials. This study firstly presents a general review of additive manufacturing in construction and then examines the main characteristic of the material formulation and printability properties based on extrusion technique. This framework comes with experimental tests to determine a qualitative printability index of mixtures. It uses mix-designs reported in the literature to define interval ratio of mixture design to be investigated in this study. The focus was put on two criteria that influence the formulation namely flowability and buildability. Two practiced based tests, mini slump and cone penetrometer, were used to draw the flowability and buildability dimensionless index. The results were analyzed by introducing an optimal printability coefficient and examining their time evolution. An optimal time of printing was determined Toptimal. Finally, a 3D mortar printing system and its operational process are presented. Then, based on the measurement, the optimal mixture is identified and printed in a large-scale geometry.

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Section: State Of the Art And Research Objectivesmentioning

confidence: 93%

Experimental Approach for Printability Assessment: Toward a Practical Decision-Making Framework of Printability for Cementitious Materials

et al. 2019

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“…Previous research indicated that 3D‐printed cement‐based elements exhibited zones of weakness at the interfaces between individual filaments, a phenomenon not commonly observed in conventionally cast hcp. The heterogeneous characteristics of the interfacial regions (IRs) in the 3D‐printed solid prism (with 0° filament orientation) were characterized using X‐ray micro‐CT and are shown in Figure S3a,b (Supporting Information).…”

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confidence: 90%

“…Currently, there are two approaches toward enhancement of the mechanical response of additively manufactured materials: a) elimination of detrimental heterogeneities such as porosities and interfaces present in fabricated metallic, ceramic, and hydrogel materials via optimizing the printing parameters in order to achieve performance comparable to cast counterparts and; b) incorporation of multiscale, hierarchical, and bioinspired design principles over a broad range of architectures of fabricated materials, from nano to micro, in order to engineer the mechanical properties, to significantly enhance the strength and tensile performance, load‐bearing capacity, compliancy, and impact resistance, and to overcome the brittleness and flaw‐sensitivity limitations of these materials . Similar to the trends observed in other additively manufactured materials, the presence of weak interface is considered detrimental for the overall mechanical performance of additively manufactured cement‐based materials, and current research efforts focus mostly on eliminating or strengthening the AM‐induced interfaces as a mean to minimize their effect on the overall strength, bearing capacity and to improve stress transfer across the interfaces in 3D‐printed elements . Contrary to the common approach that suggests elimination of the processing‐induced interfaces in various materials, we present a novel approach that combines harnessing the properties of heterogeneous interfaces with the design of material's architecture that can promote favorable damage mechanisms, allows for achievement of flaw tolerance and unique load–displacement response, and enhances the mechanical response in brittle cement‐based materials.…”

mentioning

confidence: 99%

“…Despite recent works on processing, and characterization of mechanical performance of 3D‐printed cement‐based materials, as well as earlier works on microstructural aspects of fracture properties of hardened cement paste (hcp), there are only limited studies that highlight control of the mechanical behavior through the architectural design of the materials . Due to its intrinsic properties, the cast hcp does not exhibit typical toughening mechanisms, e.g., crack branching, observed in other materials .…”

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confidence: 99%

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Additive Manufacturing and Performance of Architectured Cement‐Based Materials

et al. 2018

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There is an increasing interest in hierarchical design and additive manufacturing (AM) of cement-based materials. However, the brittle behavior of these materials and the presence of interfaces from the AM process currently present a major challenge. Contrary to the commonly adopted approach in AM of cement-based materials to eliminate the interfaces in 3D-printed hardened cement paste (hcp) elements, this work focuses on harnessing the heterogeneous interfaces by employing novel architectures (based on bioinspired Bouligand structures). These architectures are found to generate unique damage mechanisms, which allow inherently brittle hcp materials to attain flaw-tolerant properties and novel performance characteristics. It is hypothesized that combining heterogeneous interfaces with carefully designed architectures promotes such damage mechanisms as, among others, interfacial microcracking and crack twisting. This, in turn, leads to damage delocalization in brittle 3D-printed architectured hcp and therefore results in quasi-brittle behavior, enhanced fracture and damage tolerance, and unique load-displacement response, all without sacrificing strength. It is further found that in addition to delocalization of the cracks, the Bouligand architectures can also enhance work of failure and inelastic deflection of the architectured hcp elements by over 50% when compared to traditionally cast elements from the same materials.

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“…The authors of this paper have studied the structural behavior of concrete using numerical methods for many years [5]. In continuum approaches, the material is assumed to be continuous.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the interfaces of 3D‐printed concrete using discrete element method

Valle‐Pello

Rabanal

Alonso-Martínez

et al. 2019

Materialwissenschaft Werkst

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3D concrete printing is an additive manufacturing method which reduces the time and improves the efficiency of the construction process. Structural behavior of printed elements is strongly influenced by the properties of the material and the interface surfaces. The printing process creates interface surfaces between layers in the horizontal and vertical directions. The bond strength between layers is the most critical property of printed elements. In this paper, the structural behavior of printed elements is studied using the discrete element method. The material is modelled using discrete particles with bonding between them. A new discrete model of a multilayer geometry is presented to study the behavior of the interfaces of printed concrete. The layers are made up of randomly placed particles to simulate the heterogeneous nature of concrete. The numerical model is developed to simulate the flexural behavior of multilayer specimens. A four‐point flexural test is simulated considering the interface surfaces between layers. This numerical model provides relevant results to improve the behavior of this kind of structural elements. The aim of this work is to provide a discrete element model to predict the mechanical behavior of 3D concrete printed components.

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Effects of interlocking on interlayer adhesion and strength of structures in 3D printing of concrete

Cited by 227 publications

References 29 publications

Experimental Approach for Printability Assessment: Toward a Practical Decision-Making Framework of Printability for Cementitious Materials

Experimental Approach for Printability Assessment: Toward a Practical Decision-Making Framework of Printability for Cementitious Materials

Additive Manufacturing and Performance of Architectured Cement‐Based Materials

Numerical study of the interfaces of 3D‐printed concrete using discrete element method

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