Matric suction of fine sand and its effect on the shape stability of 3D printed cement mortar

Lee, Jin Hyun; Kim, Jae Hong

doi:10.1016/j.conbuildmat.2022.127618

Cited by 8 publications

(6 citation statements)

References 60 publications

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“…Nguyen-Van et al also concluded that wider filament widths and lower printing speeds improve buildability and constructability [69]. Studies related to filament widths and printing speeds have been conducted by many researchers, where process control parameters indicate some degree of influence in this failure mode [6,70,71]. However, the extent of the parametric influence appears to be confounded between the two failure modes among these studies, the outcome of which leads to a convoluted discussion in research, with the use of terms such as "collapse", "deformation" or "shape stability" as a generalized encapsulation of both failure modes [41,69,71].…”

Section: Yield Stress Evolution Rates and Deposition Speedmentioning

confidence: 99%

“…Studies related to filament widths and printing speeds have been conducted by many researchers, where process control parameters indicate some degree of influence in this failure mode [6,70,71]. However, the extent of the parametric influence appears to be confounded between the two failure modes among these studies, the outcome of which leads to a convoluted discussion in research, with the use of terms such as "collapse", "deformation" or "shape stability" as a generalized encapsulation of both failure modes [41,69,71]. The need to isolate (or combine) and study the two effects will be further revealed in the next chapter as a thin wall process control solution.…”

Section: Yield Stress Evolution Rates and Deposition Speedmentioning

confidence: 99%

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Concrete 3D Printing: Process Parameters for Process Control, Monitoring and Diagnosis in Automation and Construction

et al. 2023

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In Singapore, there is an increasing need for independence from manpower within the Building and Construction (B&C) Industry. Prefabricated Prefinished Volumetric Construction (PPVC) production is mainly driven by benefits in environmental pollution reduction, improved productivity, quality control, and customizability. However, overall cost savings have been counterbalanced by new cost drivers like modular precast moulds, transportation, hoisting, manufacturing & holding yards, and supervision costs. The highly modular requirements for PPVC places additive manufacturing in an advantageous position, due to its high customizability, low volume manufacturing capabilities for a faster manufacturing response time, faster production changeovers, and lower inventory requirements. However, C3DP has only just begun to move away from its early-stage development, where there is a need to closely evaluate the process parameters across buildability, extrudability, and pumpability aspects. As many parameters have been identified as having considerable influence on C3DP processes, monitoring systems for feedback applications seem to be an inevitable step forward to automation in construction. This paper has presented a broad analysis of the challenges posed to C3DP and feedback systems, stressing the admission of process parameters to correct multiple modes of failure.

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Section: Yield Stress Evolution Rates and Deposition Speedmentioning

confidence: 99%

Section: Yield Stress Evolution Rates and Deposition Speedmentioning

confidence: 99%

Concrete 3D Printing: Process Parameters for Process Control, Monitoring and Diagnosis in Automation and Construction

et al. 2023

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“…An illustrative summary of binder content used in previous printed concrete. [156][157][158][159][167][168][169][171][172][173][180][181][182][183][184][185]…”

Section: Hardened Properties Of 3d Printed Concretementioning

confidence: 99%

Cement Composites with Carbon‐Based Nanomaterials for 3D Concrete Printing Applications – A Review

Basha

Rehman

Aziz

et al. 2023

The Chemical Record

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3D concrete printing (3DCP) is an emerging additive manufacturing technology in the construction industry. Its challenges lie in the development of high‐performance printable materials and printing processes. Recently developed carbon‐based nanomaterials (CBNs) such as graphene, graphene oxide, graphene nanoplatelets, and carbon nanotubes, have various applications due to their exceptional mechanical, chemical, thermal, and electrical characteristics. CBNs also have found potential applications as a concrete ingredient as they enhance the microstructure and modify concrete properties at the molecular level. This paper focuses on state‐of‐the‐art studies on CBNs, 3DCP technology, and CBNs in conventional and 3D printable cement‐based composites including CBN dispersion techniques, concrete mixing methods, and fresh and hardened properties of concrete. Furthermore, the current limitations and future perspectives of 3DCP using CBNs to produce high‐quality composite mixtures are discussed.

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“…Due to low flowability being a prerequisite for achieving buildability and maintaining shape and position after deposition of 3D concrete printing, the initial UHPC dosage was modified. According to previous research, to control the behavior of concrete printing materials, the water-to-binder ratio (w/b) can also be modified [22]. Hence, a low concrete slump can be achieved by reducing the amount of water or water reducers.…”

Section: Materials and MIX Preparationmentioning

confidence: 99%

“…On the other hand, during the first part of the tests, strain hardening was observed in the samples at low load (about 17 kPa), as shown in Figure 9b. Lee et al [22] attributed the phenomenon to the viscous resistance between particles until critical stress was reached due to the greater contact force between cement particles due to the lack of water. Gong et al [31] described the phenomenon in three stages.…”

Section: Fresh Propertiesmentioning

confidence: 99%

Mechanical Performance of Commercially Available Premix UHPC-Based 3D Printable Concrete

et al. 2022

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Several recent studies have attempted to formulate printable cementitious materials to meet the printing requirements, but these materials are designed to work with specific printing equipment and printing configurations. This paper aims to systematically develop and perform characterization of a commercially available ultra-high-performance concrete-class material (UHPC) modified to be printable. Four percentages of superplasticizer were used (100%, 94%, 88%, 82%) to adjust the UHPC mixture for 3D-printing requirements. A superplasticizer amount of 88% was considered adequate to meet the requirements. Several fresh and hardened properties of UHPC were measured experimentally: shape-retention ability and green strength were investigated in fresh state, and compressive and flexural strength were evaluated in three loading directions to evaluate the anisotropic effects. Furthermore, the strength of the interlayer bond was investigated. The UHPC developed in this study met the criteria for extrudability, buildability, and shape retention to ensure printability. In comparison with mold-cast UHPC, printed UHPC exhibited superior flexural performance (15–18%), but reduced compressive strength (32–56%). Finally, the results demonstrated that a commercially available UHPC-class material can be used for 3DCP, which possesses all necessary properties, both fresh and hardened.

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Matric suction of fine sand and its effect on the shape stability of 3D printed cement mortar

Cited by 8 publications

References 60 publications

Concrete 3D Printing: Process Parameters for Process Control, Monitoring and Diagnosis in Automation and Construction

Concrete 3D Printing: Process Parameters for Process Control, Monitoring and Diagnosis in Automation and Construction

Cement Composites with Carbon‐Based Nanomaterials for 3D Concrete Printing Applications – A Review

Mechanical Performance of Commercially Available Premix UHPC-Based 3D Printable Concrete

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