Experimental and numerical analysis of 3D printed cement mortar specimens using inkjet 3DP

Shakor, Pshtiwan; Gowripalan, Nadarajah; Rasouli, Habib

doi:10.1007/s43452-021-00209-3

Cited by 22 publications

(14 citation statements)

References 26 publications

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“…The experimental testing did not reveal significant separation or debonding at the interfaces between the concrete, Sikadur mortar, and NSM components. Hence, the assumption of a successful bond was made in the FE modeling [40][41][42][43][44]. According to the findings of Banjara and Ramanjaneyulu [45], it was demonstrated that the utilization of the perfect bond yielded more accurate FE outcomes in comparison to the interface element, as evidenced by the experimental result comparison.…”

Section: Fe Model Set-upmentioning

confidence: 99%

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Abadel

2024

Materials Science-Poland

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It is essential to retrofit deep beams with shear inadequacies because these beams, although they have the same shear and flexural reinforcements as ordinary beams, are more susceptible to shear failure. Hence, it is of great significance to overcome the shear weaknesses in deep beams. This research paper aims to experimentally examine the effectiveness of near-surface mounted (NSM) carbon fiber reinforced polymer (CFRP) for retrofitting reinforced concrete (RC) deep beams subjected to shear forces. The study involved three different types of specimens. The first specimen was constructed with concrete throughout its span and included shear stirrups. The second specimen was divided into two halves, with one half lacking shear reinforcements and the other half having them. The third specimen had steel web reinforcement in one half of the span, while the other half was strengthened using NSM CFRP U-wrap strips and externally bonded horizontal CFRP strips. The proposed strengthening method significantly increased the shear strength of the deep beams, surpassing that provided by steel web reinforcement alone. Furthermore, the NSM CFRP strengthened specimen exhibited a change in failure mode from shear to flexural failure. In comparison to the control beam without stirrups, the beams strengthened with NSM CFRP U-wrap strips demonstrated an impressive 82% improvement in shear strength, while the beam with shear reinforcement showed a 23 % enhancement in load capacity. The proposed strengthened scheme is capable of enhancing the structural performance and load-carrying capacity effectively. A finite element model was generated utilizing ABAQUS software to simulate the behavior of the tested deep beams and verified against the experimental outcomes. The numerical models successfully predicted the behavior of the RC deep beams strengthened with NSM CFRP when compared to the experimental data.

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Section: Fe Model Set-upmentioning

confidence: 99%

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Abadel

2024

Materials Science-Poland

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“…In Selective Cement Activation (SCA), the particle bed consists of a dry mixture of cement and aggregates usually ranging in a volumetric ratio between 100/0 and 20/80 [1][2][3][4][5][6]. The fabrication of SCA components comprises the following steps: (1) depositing a layer of powder material in a confined region and p.r.n.…”

Section: Selective Cement Activationmentioning

confidence: 99%

Effect of Grain Size and Layer Thickness on Hardened State Properties in Selective Cement Activation

Mai,

Herding,

Lowke

2023

ce papers

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This article demonstrates the effect of varying the maximum grain size and the layer thickness of the particle bed on hardened state properties in Selective Cement Activation (SCA). The compressive strength and geometry (deviation from nominal geometry, surface roughness) are analyzed. Supplementary investigations (μCT, μRFA) are performed to explain the causes of the observed effects. It is found that the compressive strength of the manufactured specimens increases with decreasing layer thickness. This is attributed to reduced process‐induced segregation of the particle bed and fewer process‐induced voids. The geometric precision as well as the surface roughness of the printed test specimens do not differ significantly. As the grain size increases, the amount of compaction required to achieve the target packing density decreases. The compressive strength was found to increase when the grain size in the specimen is reduced. As the finer particle mixtures tend to have less void formation as a result of water application, an increased density of the specimen can be observed. The lower porosity as well as the smaller pores also have a favorable effect on geometric precision, which tends to increase with reduced grain size. At the same time, a lower surface roughness is also present.

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“…As a result of the factors mentioned above, printing quality and pumping pressure considerably impact the quantity and arrangement of intra-and inter-filament voids, hence the behavior of printed structures. According to the literature, the compressive strength of 3D printed samples is directly influenced by the loading orientation due to anisotropy (Shakor et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Geopolymer 3D printing: a comprehensive review on rheological and structural performance assessment, printing process parameters, and microstructure

Barve,

Bahrami,

Shah

2023

Front. Mater.

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Geopolymers are under scrutiny as a sustainable alternative to cement in 3D printing for eco-friendly construction. Geopolymer 3D printing (G3DP) holds promise for green construction and advanced manufacturing. This study addresses G3DP’s rheological properties, printability, and microstructure analysis. Results indicate the pivotal role of the rheological properties in the printability, encompassing parameters like the pumpability, extrudability, and shape retention. Lower viscosity and appropriate yield stress are crucial. The structural performance of G3DP, given its inherent anisotropic nature and assessment techniques, is scrutinized. Process variables such as nozzle design and print speed and interval affect the printability, buildability, and structural properties. Research on the parameters’ optimization is necessary. Additionally, evaluation techniques for the G3DP’s rheological and structural behaviors require standardization. Understanding the G3DP’s rheology is paramount for the successful 3D printing construction. Findings offer quantitative insights into the importance of the rheological properties for the printability and structural performance. The microstructural analysis uncovers the porosity and density disparities compared to traditional geopolymers. This comprehensive review provides valuable insights for researchers and practitioners to enhance the G3DP’s application as a futuristic sustainable construction material.

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Experimental and numerical analysis of 3D printed cement mortar specimens using inkjet 3DP

Cited by 22 publications

References 26 publications

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Effect of Grain Size and Layer Thickness on Hardened State Properties in Selective Cement Activation

Geopolymer 3D printing: a comprehensive review on rheological and structural performance assessment, printing process parameters, and microstructure

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