Structural built-up of cement-based materials used for 3D-printing extrusion techniques

Perrot, Arnaud; Rangeard, Damien; Alexandre, Pierre

doi:10.1617/s11527-015-0571-0

Cited by 617 publications

(318 citation statements)

References 31 publications

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“…For concrete, some work has been done such as MRI on suspensions [48] and visualizing flow on the upper surface of a concentric viscometer with white powder on the fresh, rotating surface to facilitate observation [49]. If the yield stress is larger than 10 3 Pa [50], viscosity cannot be accurately characterized and other tools and strategies are required to obtain reliable rheological properties [10][11][12].…”

Section: Plug Flow 43mentioning

confidence: 99%

“…The properties focused on are the flow curves, thixotropic and visco-elastic behavior. For pastes with a yield stress in the order of 10 3 Pa or higher, different principles than the concepts discussed in this letter apply [10][11][12]. This letter also only discusses cement pastes, as RILEM TC 266 is preparing a state-of-theart report on measuring the rheological properties of mortar and concrete.…”

Section: Introductionmentioning

confidence: 99%

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Measuring Rheological Properties of Cement Pastes: Most common Techniques, Procedures and Challenges

et al. 2017

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The science of rheology is increasingly used to describe the properties of fresh cement paste. Compared to standard workability tests, rheological properties allow for more fundamental investigation, more precise phenomenological description of flow properties and serve as input for numerical simulations. Standard commercially available rheometers are typically used to perform those measurements. However, the results of the measurement depend on the geometry, testing procedure and a number of potential artefacts. This technical letter describes the most common techniques and procedures used to assess the rheological properties of cement paste, as well as challenges during measurements and actions to counter these challenges.

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Section: Plug Flow 43mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measuring Rheological Properties of Cement Pastes: Most common Techniques, Procedures and Challenges

et al. 2017

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“…Le et al [6] used British test for soils BS1337-9 :1990, while Kazemian et al [10] [12]. French research team [16] studied a time-dependant characteristics of the mix, proposing a new framework based on the plastic deformation of printed layer-by-layer structures.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of suitability for 3D printing of high performance concretes

et al. 2018

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Abstract. The article presents overview of additive manufacturing for concrete structures. Study focuses on specific tests used to determine suitability of high performance mixes for 3D printing. The tests include determination of compressive strength and evaluation of printing speed, extrudability and overall surface quality. Tests were performed on a HighPerformance Concrete mix with fine natural aggregate up to 2 mm. Mineral additives such as silica fume and fly ash, and superplasticizer were added to obtain proper consistency. The tests were performed using specially designed site consisting of Cartesian robot and pumping module. The design of printed paths were tailored for specific tests. The evaluation of pump performance was made by measuring pumped mix volume in time. The determination of correct pumping speed was made based on the visual quality of the printed layers. Study determines also the ability to print multilayered structures and printability window of proposed mix.

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“…For this reason, the bonding strength between the printed layers is a critical mechanical property in the extrusion-based 3D printing process [7]. In the extrusion-based 3D printing process, the printed layer needs to be strong enough to support the next upper layer without deforming or collapsing [8], and also needs to be soft enough to allow a good bond between the old and new layers. Thus the printing time interval between layers, referred to as delay time, becomes a significant factor.…”

Section: Introductionmentioning

confidence: 99%

Effect of Delay Time on the Mechanical Properties of Extrusion-Based 3D Printed Concrete

Marchment¹,

Xia²,

Dodd³

et al. 2017

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

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The extrusion-based 3D printing method is one of the main additive manufacturing techniques used in the construction industry which is capable of producing large-scale building components with complex geometries without the use of the expensive formwork. The mechanical properties of the printed concrete component are very much unlike the conventionally cast concrete. Therefore, the properties of these are important for the design of structures built with 3D printing process.In this study, a custom-made apparatus was used to simulate extrusion-based 3D printing process. Layered specimens with 10, 20 and 30 minutes delay time (i.e. the printing time interval between layers) have been printed using tailored conventional concrete mixture. Mechanical properties including compressive, flexural and inter-layer bonding strengths have been measured and the effect of delay time on the mechanical properties has been investigated.All printed specimens exhibited an anisotropic phenomenon in both compressive and flexural strengths. A significant inverted bell curve pattern emerged in the inter-layer bonding strength. The inter-layer bonding strength of the specimens with 10 minutes and 30 minutes delay time was similar, but higher than that of specimen with 20 minutes delay time. The major finding is that the surface moisture content plays a major role in the inter-layer bonding strength.

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Structural built-up of cement-based materials used for 3D-printing extrusion techniques

Cited by 617 publications

References 31 publications

Measuring Rheological Properties of Cement Pastes: Most common Techniques, Procedures and Challenges

Measuring Rheological Properties of Cement Pastes: Most common Techniques, Procedures and Challenges

Evaluation of suitability for 3D printing of high performance concretes

Effect of Delay Time on the Mechanical Properties of Extrusion-Based 3D Printed Concrete

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