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ORIGINAL ARTICLE

Tensile behaviour identification in Ultra-High Performance Fibre Reinforced Cementitious Composites: indirect tension tests and back analysis of flexural test results Francesco Lo Monte

. Liberato Ferrara

Received: 28 April 2020 / Accepted: 31 October 2020  The Author(s) 2020

Abstract Within the framework of the European Programme Horizon 2020, the Research Project ReSHEALience is currently running with the objective of developing a new approach for the design of structures exposed to extremely aggressive environments, based on Durability Assessment based Design and Life Cycle Analysis. To this aim, new advanced Ultra-High Performance Fibre Reinforced Cementitious Composites with improved durability, called Ultra-High Durability Concretes, are under investigation to characterize their tensile response in both ordinary and very aggressive conditions. In this context, the first step is to develop an effective approach for identifying the main parameters describing the overall behaviour in tension. In the present study, indirect tension tests have been performed via two techniques, based on Double Edge Wedge Splitting and 4-Point Bending Tests. Starting from the test results, a combined experimental-numerical identification procedure has been implemented in order to evaluate the effective material behaviour in direct tension in terms of stress–strain law. In the paper, the mechanical characterization for the reference mix is

F. Lo Monte (&)  L. Ferrara Department of Civil and Environmental Engineering, Politecnico di Milano, Milan, Italy e-mail: [email protected] L. Ferrara e-mail: [email protected]

reported so to describe the identification procedure adopted. Keywords ReSHEALience  Ultra-High Durability Concrete—UHDC  Tensile constitutive behaviour  Strain-hardening  Identification

1 Introduction 1.1 Research framework Within the framework of the European Programme Horizon 2020, the Research Project ReSHEALience has been launched in 2018 involving 14 Partners and 3 linked third parties all around Europe. The main objective is to develop a durability-oriented structural approach for both ordinary and extremely aggressive environments, based on the concepts of Durability Assessment based Design (DAD) and Life Cycle Analysis (LCA). The scope of the project is pursued via two different steps: (1) development of new advanced cementitious materials with improved durability, which will be hereafter called Ultra-High Durability Concretes (UHDC [1]), and (2) formulation of explicit methods for directly determining the target durability performance at the structural level.

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Materials and Structures (2020)53:145

So far, the first step has been accomplished, by formulating tensile strain-hardening Ultra-High Performance Fibre Reinforced Cement Composites (UHPFRCC) with engineered self-healing capability (obtained in the prelimiary step of the project by adding crystalline admixture). This latter property, together with