A Determination of fracture toughness in plain concrete specimens by R curve

Hamza Chbani; Bouchra Saadouki; Mostapha Boudlal; Mohamed Barakat

doi:10.3221/IGF-ESIS.49.68

A Determination of fracture toughness in plain concrete specimens by R curve

Authors

Hamza Chbani Laboratory of Control and Mechanical Characterization of Materials and Structures, National Higher School of Electricity and Mechanics, BP 8118 Oasis, Hassan II
Bouchra Saadouki Laboratory of Control and Mechanical Characterization of Materials and Structures, National Higher School of Electricity and Mechanics, BP 8118 Oasis, Hassan II
Mostapha Boudlal Laboratory of Control and Mechanical Characterization of Materials and Structures, National Higher School of Electricity and Mechanics, BP 8118 Oasis, Hassan II, Morocco
Mohamed Barakat Laboratory of Mechanics Higher Institute of Maritimes ‘Studies (ISEM), Km 7 Road El Jadida - Casablanca, Morocco

DOI:

https://doi.org/10.3221/IGF-ESIS.49.68

Keywords:

Toughness, R-curve, CMOD, SENB, Three-point bending

Abstract

Since the last two centuries, concrete has become the number one building material in the world. Therefore, we are interested in studying the mechanical behavior at failure of this material and calculate its toughness.

In this paper, we trace the R-curve to determine the critical stress intensity factor and the crack evolution by specifying the three stages: crack stopping stage, stable propagation stage and an unstable propagation stage. The R-curve was obtained from the curve connecting the crack mouth opening to the applied load for prismatic specimens normalized by ASTM and notched laterally (SENB). These specimens are made from concrete with 25 MPa compressive strength and subjected to three-point bending. The dimensionless ratio of the initial notch length and the specimen width is between 0.3 and 0.6.

During loading, we can observe an elastic deformation followed by a significant plastic deformation, the average value of the critical stress intensity factor found is 1.05 MPa.m^1/2.

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Published

24-06-2019

Issue

Vol. 13 No. 49 (2019): July 2019

Section

Miscellanea

License

Copyright
Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.

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How to Cite

A Determination of fracture toughness in plain concrete specimens by R curve. (2019). Frattura Ed Integrità Strutturale, 13(49), 763-774. https://doi.org/10.3221/IGF-ESIS.49.68