The incorporation of recycled brick aggregate in 3D printed concrete

Christen, Heidi; Zijl, Gideon van; Villiers, Wibke de

doi:10.1016/j.clema.2022.100090

Cited by 27 publications

(29 citation statements)

References 21 publications

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“…The water absorption (WA) of the RBA had been determined by Christen et al. [ 1 ], using SANS3001-AG21 [ 20 ], as 18.2%. To adapt the RBA-3DPC mix to incorporate PCM, PCM would be added to the RBA by vacuum impregnation, instead of adding extra water in the mix.…”

Section: Methodsmentioning

confidence: 99%

“…In research by Christen et al. [ 1 ], the recycling and automation potential in the construction and demolition phases were realised by the incorporation of recycled brick aggregate (RBA) in 3D printed concrete (3DPC) to create RBA-3DPC.…”

Section: Introductionmentioning

confidence: 99%

“…RBA is a variable material, with high porosity and water absorption. RBA is therefore expected to affect the rheological performance of a 3DPC mix by altering its viscosity and yield stress, and is known to negatively affect the strength of a 3DPC mix [ 1 ]. It is so far unknown how the addition of PCM to the pores of the RBA will change the rheological and mechanical properties of the 3DPC.…”

Section: Introductionmentioning

confidence: 99%

“…A rheological characterisation was performed on the PCM-3DPC mix, as well as two existing mix designs - 3DPC and RBA-3DPC, recorded by Christen et al. [ 1 ] - for comparison. The rheological characterisation was used in a buildability model developed by Kruger et al.…”

Section: Introductionmentioning

confidence: 99%

“…[ 8 ], which was validated by the print-to-collapse test of the three mixes. Mechanical characterisation tests were carried out on specimens cut from a 3D printed rectangular section of the PCM-3DPC mix and compared to results of 3DPC and RBA-3DPC mechanical characterisation tests [ 1 ]. For an understanding of the PCM leakage occurring from the pores of the RBA, scanning electron microscopy (SEM) imaging, 90-day strength tests and mass loss tests were carried out on cast and printed samples of the PCM-3DPC mix design.…”

Section: Introductionmentioning

confidence: 99%

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Phase change material infused recycled brick aggregate in 3D printed concrete

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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Sustainability and 3D concrete printing: identifying a need for a more holistic approach to assessing environmental impacts

Heywood,

Nicholas

2023

ARIN

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This paper aims to identify the current status of research in 3D concrete printing (3DCP), locate the sustainability considerations relevant to these trajectories, and to identify a gap in knowledge and future research challenge regarding the sustainability of 3DCP. To categorize the broad range of research topics within 3DCP, the paper introduces an assessment framework that subdivides this field into three sub-fields: material science, computational design, and structure and performance. Common sustainability considerations are identified for each of these sub-fields. As a result of this analysis, a lack of critical assessments on claims about the sustainability and environmental impacts of 3DCP is identified.Our survey of literature, and its analysis via this framework, finds that whilst certain sustainability aspects are highlighted, other measures and considerations are skimmed over, or omitted. It is found that whilst material optimization and the ability to create formwork-free, complex forms is noted as a main argument for the implementation of 3DCP, this claim is largely unsupported by reference or reported outcomes, and the environmental impacts are often only briefly discussed. There is a clear need for a holistic view on the sustainability issues which surround 3DCP.This paper further highlights the lack of comprehensive assessment tools and metrics for measuring the environmental impact of 3DCP and concludes that further research must be done to develop these tools, to allow architects to integrate 3DCP into sustainability-oriented design workflows. Our paper concludes that the development of these tools will lead to a more comprehensive understanding on the environmental sustainability of 3DCP, allowing research resources to be focused within each field to ensure 3DCP continues to develop in a sustainable way.

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