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

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          Abstract

          In this paper the effects of the addition of a paraffin phase change material on the strength and printability of 3D printed concrete are studied. Phase change materials are latent heat storing materials, which garner and release large amounts of energy as they change phase. The addition of phase change materials to concrete produces a composite material with maximised latent and sensible heat storage capacity. Used in buildings, this composite material has the ability to minimise unwanted heat transfer across the building envelope.

          An existing mix design (RBA-3DPC), in which 64% of the natural aggregate in a 3D printable concrete (3DPC) had been replaced with recycled brick aggregate, is adjusted by adding phase change material to the pores of the recycled brick aggregate by vacuum impregnation, creating PCM-3DPC. Rheological characterisation tests are performed on reference mix designs (3DPC and RBA-3DPC) and the PCM-3DPC mix design, and used in a buildability model to validate the number of printable layers. Mechanical characterisation tests including cube strength tests, direct tensile tests and uniaxial compressive tests are performed on cast and printed specimens of the mix designs. There is no existing research on the effects of the combined addition of recycled brick aggregate and phase change material in 3D printed concrete.

          It is concluded that the PCM-3DPC has the highest number of printable layers predicted by the model and realised by a cylindrical column print and overall, PCM-3DPC has greater strength compared to RBA-3DPC, and lower strength compared to 3DPC. The PCM-3DPC exceeds the RBA-3DPC interlayer tensile strength by 6%, intralayer compressive strength by 43% and interlayer compressive strength by 9%, and subceeds the 3DPC interlayer tensile strength by 15% and interlayer compressive strength by 13%.

          Highlights

          • Thermal energy storage recycled brick aggregates are created by vacuum impregnation.

          • 3D printable thermal energy storage concrete is created and termed PCM-3DPC.

          • PCM-3DPC has higher buildability than 3D printed concrete.

          • PCM-3DPC compressive and tensile strengths are comparable to 3D printed concrete.

          • No negative effects of phase change material on 90-day compressive cube strength.

          Abstract

          3D printed concrete; Additive manufacturing; Phase change material; Recycled brick aggregate; Rheological and mechanical characterization.

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          Most cited references27

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          Phase change materials for thermal energy storage

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            Mix design and fresh properties for high-performance printing concrete

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              • Abstract: not found
              • Article: not found

              Use of microencapsulated PCM in concrete walls for energy savings

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                Author and article information

                Contributors
                Journal
                Heliyon
                Heliyon
                Heliyon
                Elsevier
                2405-8440
                17 November 2022
                November 2022
                17 November 2022
                : 8
                : 11
                : e11598
                Affiliations
                [a ]Stellenbosch University, Private Bag X1, Matieland, 7600, Stellenbosch, South Africa
                [b ]Ulsan National Institute of Science and Technology (UNIST), 44919, Ulsan, Republic of Korea
                Author notes
                []Corresponding author. 19189109@ 123456sun.ac.za
                Article
                S2405-8440(22)02886-9 e11598
                10.1016/j.heliyon.2022.e11598
                9674557
                36411915
                74f614d7-580c-4afb-93bd-6db2a63502e7
                © 2022 The Author(s)

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                : 11 August 2022
                : 11 October 2022
                : 9 November 2022
                Categories
                Research Article

                3d printed concrete,additive manufacturing,phase change material,recycled brick aggregate,rheological and mechanical characterization

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