Characterizing Extrudability for 3D Concrete Printing Using Discrete Element Simulations

Jayathilakage, Roshan; Sanjayan, Jay; Rajeev, Pathmanathan

doi:10.1007/978-3-030-49916-7_30

Cited by 15 publications

(8 citation statements)

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“…When it comes to the extrusion-based 3DCP process, the extrudability of material depends on the material characteristics, process parameters, as well as the extruder setup as described in previous sections. Therefore, many researchers found the ram extrusion method as a potential rheological characterization method to define the rheological parameters which are important in characterizing the extrudability of the 3DCP material [15,16,[107][108][109][110][111]. Alfani et al [29] reviewed possible testing methods for extrudable cement-based material and mentioned the ram extruder as a promising test method specific to extrudable cementitious material.…”

Section: Ram Extrusionmentioning

confidence: 99%

“…In a squeeze test, the flow conditions (extensional flow conditions and shear flow) are similar to the flow conditions occurring in the extrusion of material through a narrow nozzle [118]. Therefore, useful rheological parameters important for 3DCP extrusion can be achieved from the test method [111,120,121].…”

Section: Squeeze Flow Testmentioning

confidence: 99%

“…To compare the extrudability of the three mixes, the quantification of extrudability is completed using a simple power consumption and discharge measurement technique. The authors [111] and Nerella et al [15] used the method in previous studies to characterize the extrudability of 3D printable concrete material. In this study, a screw-type extruder (developed at Digital Construction Lab, Swinburne University of Technology, Australia) (similar to [111]) is used for material extrusion.…”

Section: Extrudability Testmentioning

confidence: 99%

“…The authors [111] and Nerella et al [15] used the method in previous studies to characterize the extrudability of 3D printable concrete material. In this study, a screw-type extruder (developed at Digital Construction Lab, Swinburne University of Technology, Australia) (similar to [111]) is used for material extrusion. It has a nozzle of 30 mm in diameter.…”

Section: Extrudability Testmentioning

confidence: 99%

“…It was shown in the previous literature that an index (I p ) can be introduced to quantify the extrudability or pumpability of 3DCP material [15,111]. I p is simply the ratio of P r Q .…”

Section: Extrudability Testmentioning

confidence: 99%

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Rheometry for Concrete 3D Printing: A Review and an Experimental Comparison

2022

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The rapid advancement of 3D concrete printing (3DCP) and the development of relevant cementitious material compositions can be seen in the last few decades. The commonly used 3DCP method is to build the structure layer by layer after extruding the material through a nozzle. Initially, the pumping and extrusion of the material should be done with considerable fluidity and workability. The extruded layers should retain their shape immediately after extruding and depositing. While constructing the structure in a layerwise manner, the bottom layers should have enough early age strength to support the layers at the top. Therefore, at different processes in 3DCP, the rheological requirement is contradictory. As the rheology of the material is the deterministic factor which decides the fluidity or workability of the mix, proper rheological characterization should be completed accurately. In some instances, due to the higher stiffness, and higher time and rate-dependent material behavior (thixotropic behavior) compared to the conventional concrete, standard rheology measurement techniques have many limitations when used for 3DCP material. Therefore, non-conventional and novel techniques can be implemented with suitable material models to characterize the rheology of 3DCP material. In this study, a comprehensive review was conducted on conventional and non-conventional methods used for characterizing the rheological parameters for 3DCP material. The previously conducted studies were highlighted with the targeted 3DCP processes in the study (if applicable), and rheological parameters achieved from the test (i.e., yield stress, viscosity, and thixotropy). In addition, some experimental studies were conducted to compare several selected testing methods. The rheological parameters achieved from different test methods were compared to identify the similarities, dissimilarities, pros, and cons between the test methods. Furthermore, the extrudability and buildability studies were conducted for the mixes to demonstrate the usage of the mixes in 3DCP applications and to correlate the achieved rheological parameters with these processes.

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Section: Ram Extrusionmentioning

confidence: 99%

Section: Squeeze Flow Testmentioning

confidence: 99%

Section: Extrudability Testmentioning

confidence: 99%

Section: Extrudability Testmentioning

confidence: 99%

“…It was shown in the previous literature that an index (I p ) can be introduced to quantify the extrudability or pumpability of 3DCP material [15,111]. I p is simply the ratio of P r Q .…”

Section: Extrudability Testmentioning

confidence: 99%

See 3 more Smart Citations