Characterizing cement mixtures for concrete 3D printing

Manikandan, Karthick; Wi, Kwangwoo; Zhang, Xiao; Wang, Kejin; Qin, Hantang

doi:10.1016/j.mfglet.2020.03.002

Cited by 39 publications

(11 citation statements)

References 14 publications

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“…It is commonly used for simple printing tests without considering pumpability. Syringes [61,83] (volume less than 300 mL), dispensing tubes [4,56,57,84,85], or customized pistons [59,86] were utilized as the printing nozzle, as well as larger piston devices [8,87], such as a glue tube, as the printing nozzle, and more powerful pistons [24,63] as the pumping source.…”

Section: The Extruding Mechanismmentioning

confidence: 99%

3D Printing Devices and Reinforcing Techniques for Extruded Cement-Based Materials: A Review

Cao

Cui

et al. 2022

Buildings

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The three-dimensional (3D) printing technique for cement-based materials has been actively investigated and utilized in civil engineering. However, there is no systematic review of the fabricating devices. This paper reviews the software and hardware for extrusion-based 3D concrete printing. Firstly, a dedicated tool path generating software is urgently needed to meet the cementitious printing applications and to improve printing quality with toolpath optimizations. Secondly, the existing printing equipment was summarized and discussed, concluding the pros and cons of various 3D motion systems, material systems, and nozzle units. Suitable choices for scientific research and engineering applications were recommended. The reinforcing techniques were categorized and concluded with the existing drawbacks and the research trend. A hybrid manufacturing system of 3D printing and the reinforcing technique was then proposed with a system diagram and flowchart.

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Section: The Extruding Mechanismmentioning

confidence: 99%

3D Printing Devices and Reinforcing Techniques for Extruded Cement-Based Materials: A Review

Cao

Cui

et al. 2022

Buildings

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“…Torque values are plotted against the rotation speed of the shear vane to obtain a flow curve plot [ 43 ]. Thixotropy can be measured by using the constant shear rate test [ 44 , 45 ], hysteresis loop test [ 46 ], and reflocculation test [ 36 ]. The structuration rate has been measured by conducting stress growth tests at different time intervals before setting the concrete [ 36 , 38 ].…”

Section: Rheologymentioning

confidence: 99%

3D Concrete Printing: A Systematic Review of Rheology, Mix Designs, Mechanical, Microstructural, and Durability Characteristics

2021

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This paper provides a state-of-the-art report on the up-to-date research on the emerging 3D concrete printing technology from the concrete materials perspective. It reviews the recent research focused on understanding and characterizing the rheological necessities of the concrete printing process and discusses how the researchers are tailoring compatible mix proportions for the 3D concrete printing process by using eco-friendly binders, waste aggregates, chemical admixtures, and nano-additives. This paper systematically evaluates anisotropic behavior in the mechanical properties of printed concrete and establishes an order for anisotropic behavior in the compressive, flexural, and tensile strengths along three different axes (X, Y, and Z axes) of printed concrete. It evaluates the ratio of flexural strength to the compressive strength of printed concrete along the above three axes. This article explains the influence of variation of printing process parameters on the mechanical properties and discusses reinforcement approaches used for increasing structural performance. The microstructure at the interface of adjacent layers and also at the interface of the reinforcement-cement matrix is discussed. The recent research on the durability performance of printed concrete is critically discussed and future research needs for 3D concrete printing are identified in this paper.

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“…The exact composition of the binder and aggregate, and the particle size distribution should be designed carefully for better printability of different construction designs [27][28][29]. Various additives, such as superplasticizer, retarder, and accelerators, can be used to increase the strength of the printed material.…”

Section: Introductionmentioning

confidence: 99%

Using Calcium Oxide and Accelerator to Control the Initial Setting Time of Mortar in 3D Concrete Printing

Antoni

Widjaya

Wibowo

et al. 2022

Lecture Notes in Civil Engineering

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In recent years, 3D printing has attracted a lot of attention in the construction industry. Compared with general concrete construction, 3D concrete printing has higher flexibility in creating concrete's shape and design. 3D concrete printing requires the precise control of fresh concrete properties such as flowability, extrudability, and resistance to segregation during printing process. The initial setting time of the concrete also needs to be controlled as it needs to adhere to the next layer and then harden rapidly in order to support the upper layer. This study proposes a method to control the initial setting time of the concrete for the 3D printing process by using a mixture of calcium oxide powder and accelerators. The study showed that using 5-10% calcium oxide and 2-4% accelerator by mass of cement, the initial setting of the concrete can be varied. It is also shown that adding only accelerator prolongs the setting time of the mixture due to the plasticizer contained therein. By using calcium oxide power, the initial setting time of the concrete can be hastened and the combination of calcium oxide powder and accelerator can reduce the initial setting time while maintaining good workability of the mixture. The addition of accelerator also increases the early compressive strength of the concrete mixture.

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Characterizing cement mixtures for concrete 3D printing

Cited by 39 publications

References 14 publications

3D Printing Devices and Reinforcing Techniques for Extruded Cement-Based Materials: A Review

3D Printing Devices and Reinforcing Techniques for Extruded Cement-Based Materials: A Review

3D Concrete Printing: A Systematic Review of Rheology, Mix Designs, Mechanical, Microstructural, and Durability Characteristics

Using Calcium Oxide and Accelerator to Control the Initial Setting Time of Mortar in 3D Concrete Printing

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