Effect of testing procedures on buildability properties of 3D-printable concrete

Casagrande, Lorenzo; Esposito, Laura; Menna, Costantino; Asprone, Domenico; Auricchio, Ferdinando

doi:10.1016/j.conbuildmat.2020.118286

Cited by 66 publications

(32 citation statements)

References 26 publications

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“…In a recent review article, Mechtcherine et al [14] summarized the progress made in this regard. Some noteworthy mentions are: the methods developed based on Mohr-Coulomb failure criterion, parameterizing the cohesion and angle of internal friction of the material [58][59][60][61][62], and numerical models considering both the plastic yielding and elastic buckling criteria [63][64][65][66][67][68][69][70]. Another possible approach for predicting the failure and deformation during the printing process of cementitious materials is by using three-dimensional rheological models that can accurately describe its mechanical behaviour before and after yielding.…”

Section: Materials Behaviour At Early Agementioning

confidence: 99%

Extrusion-based concrete 3D printing from a material perspective: A state-of-the-art review

Mohan

Rahul

Schutter

et al. 2021

Cement and Concrete Composites

228

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Section: Materials Behaviour At Early Agementioning

confidence: 99%

Extrusion-based concrete 3D printing from a material perspective: A state-of-the-art review

Mohan

Rahul

Schutter

et al. 2021

Cement and Concrete Composites

228

View full text Add to dashboard Cite

“…Based on the above analysis, weights of 150 g ± 10 g were used in the study: The study determined the relationship between axial normal stress and axial normal strain ( − ) of materials measured in a squeezing test after 15, 30 and 45 min of adding the water ( -printing time). The test was performed on a low-force compression device that allows for applying the force in the range of 5-200 N. The measurement error of the setup is ± 0.5 N. Consecutive loads were added at the appropriate time interval as presented in [17,34]. Three time intervals (cycle time) of 10 s, 15 s and 20 s were assumed.…”

Section: Methodsmentioning

confidence: 99%

“…A model based on the Coulomb-Mohr theory for cement materials was used in the studies [31][32][33]. Casagrande et al [34] based on other studies [23,28,30] analyzed the way the printed structure failed due to loss of stability.…”

Section: Introductionmentioning

confidence: 99%

“…On this basis, the time until the structure collapsed and the accompanying stresses were determined. The above described way of determining the mixture parameters was widely used by other researchers [4,30,34,41]. However, there are a number of factors that can affect the printing process such as nozzle type, deposit speed, printer type, or pump model [23][24][25]42].…”

Section: Introductionmentioning

confidence: 99%

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3D Concrete Printing for Sustainable Construction

2020

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Despite the rapid development of 3D printing technology for cement composites, there are still a number of unsolved issues related to extrusion printing. One of them is proper mix design that allows for meeting criteria related to the printing of cementitious materials, such as pumpability, buildability, consistency on the materials, flowability and workability, simultaneously incorporating sustainable development ideas. In the case of mixes for 3D printing, the modification of the composition which increases the overall performance does not always go hand in hand with the reduction of negative environmental impact. The article presents the results of tests of eight mixtures modified with reactive and inert mineral additives designed for 3D printing. The mixes were evaluated in terms of their rheological and mechanical properties as well as environmental impact. Initial test results were verified by printing hollow columns up until collapse. Later, the differences between the compressive strength of standard samples and printed columns were determined. In order to summarize the results, a multi-faceted analysis of the properties of the mixes was carried out, introducing assessment indicators for its individual parameters. The article proves that appropriate material modification of mixes for 3D printing can significantly reduce the negative impact on the environment without hindering required 3D printing properties.

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“…Certain, similar to ones used in soil mechanics test have also been applied, including uniaxial unconfined compression test [34] and direct shear test. A research [35] incorporated a cylindrical specimen with 60 mm diameter and 120 mm height for the purpose of the study. Numerical models for predicting variation in the stress and strain values of the individual layers of a structure as a whole, over time, are also being developed [32,[34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Automation in the Construction of a 3D-Printed Concrete Wall with the Use of a Lintel Gripper

et al. 2020

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Developments in the automation of construction processes, observable in recent years, is focused on speeding up the construction of buildings and structures. Additive manufacturing using concrete mixes are among the most promising technologies in this respect. 3D concrete printing allows the building up of structure by extruding a mix layer by layer. However, the mix initially has low capacity to transfer loads, which can be particularly troublesome in cases of external components that need to be placed on top such as precast lintels or floor beams. This article describes the application of additive manufacturing technology in the fabrication of a building wall model, in which the door opening was finished with automatic lintel installation. The research adjusts the wall design and printing process, accounting for the rheological and mechanical properties of the fresh concrete, as well as design requirements of Eurocode. The article demonstrates that the process can be planned precisely and how the growth of stress in fresh concrete can be simulated, against the strength level developed. The conclusions drawn from this research will be of use in designing larger civil structures. Furthermore, the adverse effects of concrete shrinkage on structures is also presented, together with appropriate methods of control.

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Effect of testing procedures on buildability properties of 3D-printable concrete

Cited by 66 publications

References 26 publications

Extrusion-based concrete 3D printing from a material perspective: A state-of-the-art review

Extrusion-based concrete 3D printing from a material perspective: A state-of-the-art review

3D Concrete Printing for Sustainable Construction

Automation in the Construction of a 3D-Printed Concrete Wall with the Use of a Lintel Gripper

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