Fracture energy and strain softening of concrete as determined by means of compact tension specimens

Wittmann, Folker H.; Rokugo, Keitetsu; Brühwiler, Eugen; Mihashi, Hirozo; Simonin, P.

doi:10.1007/bf02472525

Cited by 201 publications

(96 citation statements)

References 5 publications

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“…Its direct applicability in concrete, however, entails some inconveniences, such as drilling the holes necessary to apply the pulling forces and the hazard of a local fracture originated at these holes. Wittmann et al (1988) are the pioneer in the application of CT tests in concrete but using large specimens in order to avoid premature failures. Wagoner et al (2005), tried to apply this test methodology to smaller and disk-shaped specimens of concrete (more appropriated in case of specimens obtained from drill cores) but they ran into troubles obtaining premature failures at the pulling load holes in about 50% of the tests, thus evidencing the disability of a direct application of the procedure.…”

Section: )mentioning

confidence: 99%

“…The former, carried out on prismatic notched beams, is the most widespread procedure due to its simplicity and the satisfactory results it provides Bazant 1996;Bazant and Kazemi 1991;RILEM 1985). The latter requires notched compact specimens, usually cube or prismatic specimens, preventing the mentioned disadvantages of the conventional CT specimens (Bruhwiler and Wittmann 1990;Cifuentes and Karihaloo 2013;Wittmann et al 1988).…”

Section: )mentioning

confidence: 99%

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Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Cifuentes

Lozano

Holušová

et al. 2017

Int J Concr Struct Mater

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A new approach for measuring the specific fracture energy of concrete denoted modified disk-shaped compact tension (MDCT) test is presented. The procedure is based on previous ideas regarding the use of compact tension specimens for studying the fracture behavior of concrete but implies significant modifications of the specimen morphology in order to avoid premature failures (such as the breakage of concrete around the pulling load holes). The manufacturing and test performance is improved and simplified, enhancing the reliability of the material characterization. MDCT specimens are particularly suitable when fracture properties of already casted concrete structures are required. To evaluate the applicability of the MDCT test to estimate the size-independent specific fracture energy of concrete (G F ), the interaction between the fracture process zone of concrete and the boundary of the MDCTspecimens at the end of the test is properly analyzed. Further, the experimental results of G F obtained by MDCT tests for normal-and high-strength selfcompacting concrete mixes are compared with those obtained using the well-established three-point bending test. The procedure proposed furnishes promising results, and the G F values obtained are reliable enough for the specimen size range studied in this work.

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Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Cifuentes

Lozano

Holušová

et al. 2017

Int J Concr Struct Mater

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“…The response of the member was analysed using exponential [33], bilinear [35], and linear [32] representations, with no stress transfer and full stress transfer across crack interfaces in the tension post-peak regime. For a full hypothetical transfer of tensile forces across cracks (constant tension stiffening), the results showed an increase in the predicted stiffness and peak load, whereas for the case without tension stiffening, the models experienced severe divergence problems.…”

Section: Constitutive Parametersmentioning

confidence: 99%

Experimental and numerical assessment of mixed RC beam and steel column systems

Moharram

Bompa

Elghazouli

2017

Journal of Constructional Steel Research

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“…1: Typical stress-strain of concrete and its constituent materials [1] Fig. 2: Fracture process zone (FPZ) in concrete [3] Cracking of concrete: It is also reported that some cracks are initiated at cement paste voids and then crack away of the transition zone. In the mean time, it is well established that even before the application of external stresses, microcracks already exist in the TZ as a result of shrinkage and thermal stresses.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Tenacity of the Concrete Mortars Exposed to Elevated Temperatures

Djaknoun¹

2009

American Journal of Applied Sciences

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Abstract:The main objective of this research was the characterisation of the fracture toughness of concrete mortars exposed to high temperatures by using notched specimens in three point bending tests. The specimens have different lengths and were heated at different temperatures ranging from room temperature up to 900°C. The experimental test results obtained are closed with those reported by the literature, it shows that beyond approximately 300°C, the fracture loads decrease strongly with the rise in heating temperature. However, between the room temperature (25°C) and 300°C, we recorded an increase of the fracture load. Two methods using the experimental critical load were applied to calculate the fracture toughness of concrete mortars: an analytical method based on the mechanics of continuous medium theory and a numerical approach using finite elements method. The numerical modelling has then been validated, discussed and compared with analytical solution. Comparison between the experimental results and the theory predictions was quite good.

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Fracture energy and strain softening of concrete as determined by means of compact tension specimens

Cited by 201 publications

References 5 publications

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Experimental and numerical assessment of mixed RC beam and steel column systems

Characterization of the Tenacity of the Concrete Mortars Exposed to Elevated Temperatures

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