PSI - Issue 41

ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceDir t Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 41 (2022) 699–703

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2Guest Editors. Abstract This contribution presents the first results of an ongoing research aimed at highlighting the possible reduction in the environmental impact of concrete through the synergy between two interconnected strategies: the exploitation of by-products, in this case biochar, for the realization of 3D printable cementitious conglomerates. Thanks to the use of biochar, the mixes presented are characterized by an excellent dimensional stability in the fresh state, evaluated through the extrusion test. Regarding the hardened state properties, the contribution highlights the effects of biochar-to-cement ratio, water-to-cement ratio (in combination with biochar content) and sand-to-cement ratio on the flexural and compressive strength of the mixes. The evaluation of CO 2 emissions shows that a proper mix design could result in a significant reduction in CO2 emissions (up to 43%) while maintaining good mechanical performance (compressive strength of at least 60 MPa). © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) 1. Introduction In recent years, the building sector is characterized by a growing interest in the research for solutions that can help reduce environmental impact. This can be seen in the growing number of studies focused on reducing the environmental impact of the most widely used material in the construction field: concrete. There are several studies in the relevant literature that aim to use wastes and by-products in cementitious conglomerates as partial replacements for traditional aggregates or as filler additions: recycled PET (Beibei Xiong et al, 2021), (Mercante et al, 2018), nanoparticles obtained by pyrolysis of peanuts and hazelnut shells (Khushnood et al, 2016), (Restuccia et al, 2018), biochar (Restuccia et al, 2016a), demolition wastes (Restuccia et al, 2016b), (Rao et al, 2007). In any case, 2nd Mediterranean Conference on Fracture and Structural Integrity Biochar addition for 3DCP: a preliminary study Devid Falliano a *, Luciana Restuccia a , Giuseppe Andrea Ferro a a Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129 Turin, Italy Abstract This contribution presents the first results of an ongoing research aimed at highlighting the possible reduction in the environmental mpact of concr te through the synergy between two interconnected strate ies: the exploitation of by-pr ducts, in this case biochar, for the realization of 3D pri table cem ti ious conglomerate . Thank o the use of bi char, the mixes presented are characterized by n excellent d mensional stab lity in the fr sh tate, evaluated through the extrusion test. R garding th hardened state properties, th contributi highlights the eff cts of biochar-to-cem nt ratio, wa er-to-cement ratio (in combination with biochar c ntent) and sa d-to-cement ratio on th lexural and compr ssive strength of he mixes. The evaluation of CO 2 emissi ns shows that proper mix design could result in a significant reduction in CO2 emissions (up to 43%) whi e maintaining good mechanical performance (compressive strength of at least 60 MPa). © 2022 The Authors. Publis ed by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of MedFract2Guest Editors. K ywords: 3D concret printing; biochar; compressive strength; CO 2 emissions. 1. Introduction In recent years, the building sector is characterized by a growing interest in the research for solutions that can help reduce environmenta mpact. Th an be seen in the growing umber of studi s focused on reducing the environmental impact of the ost widely used mat rial in t construction fi ld: concrete. Ther are several studies i the relev nt literature that aim to s was s and by-products i c mentitious conglomerat s s part al replacem nts for traditional aggregates or as filler additions: recycled PET (Beibei Xiong et al, 2021), (Mercante et al, 2018), anoparticles obtained by pyr ly is of peanu s and haze nut shells (Khushn od 16 Restuccia biochar (Restucci et al, 2016a), demolitio wastes (Restuccia et al, 2016b), (Rao et al, 2007). In any s , 2nd Mediterranean Conference on Fracture and Structural Integrity Biochar addition for 3DCP: a preliminary study Devid Falliano a *, Luciana Restuccia a , Giuseppe Andrea Ferro a a Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129 Turin, Italy Peer-review under responsibility of the MedFract2Guest Editors. Keywords: 3D concrete printing; biochar; compressive strength; CO 2 emissions.

* Corresponding author. E-mail address: devid.falliano@polito.it * Corresponding author. E-mail address: devid.falliano@polito.it

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the MedFract2Guest Editors. 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review u der responsibility of t MedFract2Guest Editors.

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2Guest Editors. 10.1016/j.prostr.2022.05.079