PSI - Issue 47

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 47 (2023) 800–811

© 2023 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 IGF27 chairpersons The aim of this paper is to present the numerical results of a preliminary analysis on the effect of carbon nanofillers on the stress strain behavior of the cementitious matrix, as well as on the bond interaction between the matrix and the steel fibers constituting UHPFRC. For this purpose, the meso-mechanical model developed by two of the authors for the study of the post-cracking response of fiber reinforced concrete, is here extended and applied for evaluating the effects of the addition of nanofiller on the cracking and the post-cracking response of UHPFRC specimens. In order to characterize the stress-strain relationships of the cementitious matrix and to back-calculate the bond-slip laws of steel fibers embedded within the latter, a comparison with the experimental results available in the literature has been also developed. © 2023 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 IGF27 chairpersons Keywords: Cracked-hinge approach; Experimental validation; UHPFRC; Meso-mechanical model; steel fibers; carbon nanotube. Introduction Owing to its cost-effectiveness, long-lasting performance and compressive strength, conventional concrete is the most widely used material for building structures worldwide. Despite this, its propensity to crack formation and low tensile strength has led a growing number of academics and researchers to design innovative concretes as an alternative to 27th International Conference on Fracture and Structural Integrity (IGF27) On the effect of carbon nanotubes in Ultra-High Performance Fibers Reinforced Concrete Luciano Feo a* , Annavirginia Lambiase a , Enzo Martinelli a , Rosa Penna a , Marco Pepe b a Department of Civil Engineering, University of Salerno, Fisciano, 84084, Italy b TESIS srl, Fisciano, 84084, Italy Abstract The addition of carbon nanotubes is an effective method to enhance mechanical properties and durability performance of structural concrete. Recently, experimental studies have investigated the behavior of Ultra-High Performance fibers reinforced Concrete (UHPFRC) mixtures including steel fibers and the carbon nanotubes duly dispersed within their matrix. 1.

* Corresponding author. Tel: +39-089-964-096 E-mail address: lfeo@unisa.it

2452-3216 © 2023 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 IGF27 chairpersons

2452-3216 © 2023 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 IGF27 chairpersons 10.1016/j.prostr.2023.07.039