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Size dependence of concrete fracture energy determined by RILEM work-of-fracture method

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Current Trends in Concrete Fracture Research

Abstract

The paper analyzes the size dependence of the fracture energy of concrete obtained according to the existing RILEM recommendation proposed by Hillerborg and based on the work-of-fracture method of Nakayama, Tattersal and Tappin, in which the energy dissipated at the fracture front is evaluated from the measured load-displacement curve. The analysis is based on the size effect law proposed by Bažant, which has been shown to be applicable to the size ranges up to about 1:20 and apply in the same form for all specimen geometries. The analysis utilizes the previously developed method for calculating the R-curve from the size effect, and the load-deflection curve from the R-curve. The R-curve is dependent on the geometry of the specimen. The results show that the fracture energy according to the existing RILEM recommendation is not size-independent, as desired, but depends strongly on the specimen size. This dependence is even stronger than that of the R-curve. When the specimen size is extrapolated to infinity, the fracture energy according to the RILEM recommendation coincides with the fracture energy obtained by the size effect method. It is also found that, in fracture specimens of usual sizes, the pre-peak contribution of the work of the load to the fracture energy is relatively small. Finally, as a by-product, the analysis also verifies the fact that, in three-point bend fracture specimens, the fracture energy according to the RILEM definition is dependent on the notch depth.

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Authors and Affiliations

  1. Center for Advanced Cement-Based Materials, Northwestern University, 60208, Evanston, Illinois, USA

    Zdeněk P. Bažant & Mohammad T. Kazemi

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  1. Zdeněk P. Bažant
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  2. Mohammad T. Kazemi
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  1. Northwestern University, Evanston, Illinois, USA

    Z. P. Bažant

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© 1991 Springer Science+Business Media Dordrecht

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Bažant, Z.P., Kazemi, M.T. (1991). Size dependence of concrete fracture energy determined by RILEM work-of-fracture method. In: Bažant, Z.P. (eds) Current Trends in Concrete Fracture Research. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3638-9_9

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  • DOI: https://doi.org/10.1007/978-94-011-3638-9_9

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-5615-1

  • Online ISBN: 978-94-011-3638-9

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