PSI - Issue 64

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

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Procedia Structural Integrity 64 (2024) 1134–1141

SMAR 2024 – 7 th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures A novel structural and energy cementitious material for nearly-zero energy buildings Mahdi M. K. Zanjani a , Victor Fachinotti b , Paula Folino c , Antonio Caggiano a,* a Dipartimento di Ingegneria Civile, Chimica e Ambientale, University of Genoa, Genoa, Italy b CIMEC, CONICET, National University of Littoral, Santa Fe, Argentina c LMNI, INTECIN, FIUBA, Universidad de Buenos Aires, Buenos Aires, Argentina Abstract A novel material with tunable dynamic insulations, thermal energy storage, and structural properties is presented in this work. The so-presented NRG&STRUCT concrete is a porous concrete made of microencapsulated phase-change materials (mPCM) which are embedded within the cement-based mix. A strength-based theory accounting for the porosity together with a quality-based index, and the mPCM content are the most relevant parameters to control the structural and energy performance in an NRG&STRUCT concrete. The work thus presents the energy performance of a demo-building made of this material. Layer-wise graded NRG&STRUCT concrete are used in external walls. At each layer, the material is characterized by its strength index and mPCM content, which both play the role of design variables to be determined by solving an optimization problem where the objective function is the energy consumption for keeping the indoor thermal comfort, computed by EnergyPlus. These design variables are continuous, allowing the use of gradient-based optimization solvers. The structural stability of the energetically optimal solutions is forced via constraints on minimal density. © 2024 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 SMAR 2024 Organizers Keywords: Structural concrete; energy saving; cementitious materials; nearly-zero energy buildings. © 2024 The Authors. Published by Elsevier B.V.

* Corresponding author: Antonio Caggiano Tel.: +39 375 585 4555. E-mail address: antonio.caggiano@unige.it

2452-3216 © 2024 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 SMAR 2024 Organizers

2452-3216 © 2024 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 SMAR 2024 Organizers 10.1016/j.prostr.2024.09.159