Mechanical characterization of 3D printable concrete

Rahul, A.V.; Santhanam, Manu; Meena, Hitesh; Ghani, Zimam

doi:10.1016/j.conbuildmat.2019.116710

Cited by 172 publications

(74 citation statements)

References 18 publications

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“…In addition, the interval time, the delay between the deposition of subsequent layers, has been varied in some of these tests. For an interval time of around zero to one minute, Le et al [22] and Rahul et al [27] found about a 40% decrease, whereas Wolfs et al [15] found only a 15% decrease and Zhang et al [23] found nearly equal values of casted and printed specimens. [28]; determination of fracture energy with (e) uniaxial tensile test setup of dog-bone shaped specimen [24] and cylindrical specimen [22]; (f) 3-point bending tes.t setup [29].…”

Section: Review Of Current Characterization Methods For Constitutive mentioning

confidence: 97%

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Mechanical Properties of Hardened 3D Printed Concretes and Mortars—Development of a Consistent Experimental Characterization Strategy

Meurer

Claßen

2021

Materials

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Today, it is already foreseeable that additive manufacturing of mortar and concrete has groundbreaking potential and will revolutionize or at least fundamentally change the way we build. In recent years, 3D concrete printing (3DCP) with extrusion-based deposition methods has been pushed forward by a growing research community. Albeit being regarded one of the most promising innovations in construction industry, a consistent characterization methodology for assessing the constitutive behavior of 3D printed, hardened cementitious materials is missing, so far, which hinders its widespread use in engineering practice. The major objective of this paper is to fill this gap by developing a new experimental framework that can thoroughly describe the mechanical properties of 3D printed cementitious materials. Based on both a review of state-of-the-art test setups and a comprehensive experimental campaign, the present paper proposes a set of easy-to-use experimental methods that allow us to assess flexural, tensile, shear and compressive strength as well as fracture energy of 3D printed concretes and mortars in a reliable and reproducible manner. The experimental results revealed anisotropic material behavior for flexural, tensile, shear and compressive loading. Furthermore, they confirm that interval time (time gap between deposition of subsequent layers) has a crucial effect on investigated material properties leading to a severe reduction in strength and fracture energy for longer interval times.

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Section: Review Of Current Characterization Methods For Constitutive mentioning

confidence: 97%

“…Further shear tests were conducted on the interface region by Rahul et al [27] as shown in Figure 1c. A decrease in shear resistance in the interface region of 22.5 to 29% compared to casted concrete was found.…”

Section: Review Of Current Characterization Methods For Constitutive mentioning

confidence: 99%

Mechanical Properties of Hardened 3D Printed Concretes and Mortars—Development of a Consistent Experimental Characterization Strategy

Meurer

Claßen

2021

Materials

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“…Pore sizes ranging between 0.2 mm and 4 mm have been reported (e.g., [10]); also see Figure 1(b). Porosity of the printed concrete after hardening has also been reported [18].…”

Section: Introductionmentioning

confidence: 87%

“…Strength of the printed specimens vary depending on whether the direction of loading is parallel or perpendicular to the printed layers [10,17,18,18]. A standard method to perform the tests (e.g., size of specimens) is yet to evolve.…”

Section: Introductionmentioning

confidence: 99%

“…Filaments of the printed concrete are "strong" as a consequence, and do not bond well with each other leaving considerable amount of voids after hardening [16,18,28,29]. Panel (a) of Figure 1 presents the schematic of a section through "strong" filaments, and panel (b) shows a surface of the printed concrete with strong filaments cut after hardening [10].…”

Section: Introductionmentioning

confidence: 99%

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Additive manufacturing of self-compacting concrete through controlled heating

Shekhar¹,

Kumar²,

Mathur³

2020

Preprint

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Construction using concrete through additive manufacturing is gaining attention. This approach involves a layer-wise deposition of concrete. A layer of printed concrete needs to be ``strong" enough to sustain the weight of layers to be printed above. These layers may not bond well with each other, however. Self-compacting concrete (SCC) may lead to a better bonding, but it may not have sufficient strength. This paper presents a method to print SCC through controlled heating. Properties of printed concrete in fresh and hardened states are studied. Heating leads to a sharp rise in the strength of freshly-printed concrete layers, but a long duration of heating may lead to a reduction in strength of printed concrete after hardening particularly if water-to-cement ratio is small or if loads are applied parallel to the printed layers.

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Ressourceneffizientes Bauen mit Betonfertigteilen Material – Struktur – Herstellung

Kromoser¹

2021

Beton Kalender 2021

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Mechanical characterization of 3D printable concrete

Cited by 172 publications

References 18 publications

Mechanical Properties of Hardened 3D Printed Concretes and Mortars—Development of a Consistent Experimental Characterization Strategy

Mechanical Properties of Hardened 3D Printed Concretes and Mortars—Development of a Consistent Experimental Characterization Strategy

Additive manufacturing of self-compacting concrete through controlled heating

Ressourceneffizientes Bauen mit Betonfertigteilen Material – Struktur – Herstellung

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