Determination of size-independent specific fracture energy of normal- and high-strength self-compacting concrete from wedge splitting tests

Cifuentes, Héctor; Karihaloo, Bhushan Lal

doi:10.1016/j.conbuildmat.2013.07.062

Cited by 58 publications

(31 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although these models are based on different fundamentals, they are related to each other. Cifuentes et al (2013) showed that if the size-dependent G f measured by the RILEM method is corrected according to the method of Elices and co-workers Guinea et al 1992;Planas et al 1992) or that of Hu and Wittmann (1992) (the latter admits a simplification as proposed by Karihaloo et al (2003) if the notch to depth ratios are well apart from each other), then the resulting specific fracture energy G F is very nearly the same and independent of the size of the specimen.…”

Section: Size Dependency Of the Specific Fracture Energy Of Concretementioning

confidence: 99%

“…The specimens used in this method are fairly compact requiring small amounts of material as compared with the notched beams employed in three-point bending tests. However, the implementation of this test type requires a more sophisticated fixture than that implied by the three-point bending test so that the number of results available in the literature from WS tests for concrete is scarce (Cifuentes and Karihaloo 2013;Korte et al 2014;Merta and Tschegg 2013;Veselý et al 2011). The fracture behavior is analyzed by wedging out the starter notch.…”

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%

“…2a) is the most widely method used for concrete fracture analysis due to the simple specimen preparation and execution Bazant 1996;Bazant and Kazemi 1991;RILEM 1985), even for fiber-reinforced concrete (Cifuentes et al 2013;Gopalaratnam and Shah 1987). However, the correct execution of the TPB method is not exempted of complications requiring some important aspects as to avoid energy dissipations outside the ligament area and to reduce the influence of the specimen geometry and loading type on the results.…”

Section: )mentioning

confidence: 99%

“…The testing has to be carried out using a closed-loop testing machine and under displacement control at a very low rate so that the specimen fracture occurs in a stable manner Cifuentes and Karihaloo 2013). Since the direct application of two pulling forces to stable split of the specimen entails a great difficulty, the usual loading arrangement consists in a wedge made from steel that is mounted between two bearings, which transform the vertical applied load (F) into two horizontal splitting loads (P) (Cifuentes and Karihaloo 2013). Additionally, the specimen is usually placed on a linear support (steel rod) fixed to the lower plate of the testing machine.…”

Section: )mentioning

confidence: 99%

See 4 more Smart Citations

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

Cifuentes

Lozano

Holušová

et al. 2017

Int J Concr Struct Mater

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Size Dependency Of the Specific Fracture Energy Of Concretementioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

See 3 more Smart Citations

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

Cifuentes

Lozano

Holušová

et al. 2017

Int J Concr Struct Mater

Self Cite

View full text Add to dashboard Cite

show abstract

Stochastic fracture‐mechanical parameters for the performance‐based design of concrete structures

Strauß

Zimmermann

Lehký

et al. 2014

Structural Concrete

View full text Add to dashboard Cite

The experimental results for quasi‐brittle materials such as concrete and fibre‐reinforced concrete exhibit high variability due to the heterogeneity of their aggregates, additives and general composition. An accurate assessment of the fracture‐mechanical parameters of such materials (e.g. compressive strength fc and specific fracture energy Gf) turns out to be much more difficult and problematic than for other engineering materials. The practical design of quasi‐brittle material‐based structures requires virtual statistical approaches, simulations and probabilistic assessment procedures in order to be able to characterize the variability of these materials. A key parameter of non‐linear fracture mechanics modelling is the specific fracture energy Gf and its variability, which has been a research subject for numerous authors although we will mention only [1, 2] at this point. The aim of this contribution is the characterization of stochastic fracture‐mechanical properties of four specific, frequently used classes of concrete on the basis of a comprehensive experimental testing programme.

show abstract

A Review on Studies of Fracture Parameters of Self-compacting Concrete

Rama

Sivakumar

Vasan

et al. 2015

Advances in Structural Engineering

View full text Add to dashboard Cite

In the recent past, the use of self-compacting concrete (SSC) as a primary structural material in complex structures such as tall buildings, submerged structures, bridges, dams, liquid and gas containment structure has increased enormously. Proper understanding of the structural behavior of SCC is absolutely necessary in designing complex concrete structures. Due to the presence of microcracks and other inherent flaws, the strength of the concrete structure decreases. Engineering fracture mechanics can deliver the methodology to compensate the inadequacies of conventional design concepts. It might be expected that SCC would exhibit more brittle behavior than normal/conventional concrete. The improved pore structure and better densification of matrix have great influence on the fracture characteristics of SCC. It is widely agreed that the strength, elastic modulus and fracture resistance of SCC decreases slightly with increased paste content. Increasing the volume of paste tends to make SCC brittle. Due to the quasi-brittle nature of concrete; various computational fracture models have been developed to study the crack characterizing parameters in concrete structures, such as fictitious crack model, crack band model, two parameter fracture model, size effect model, smeared crack model, cohesive crack band model and effective crack model. Compared to conventional vibrated concrete, self-compacting concrete often has a higher susceptibility to crack due to different mixture design, material properties and construction practices. Many studies have addressed the SCC fracture properties using different computational models. As mentioned above, all these studies are purely computational and there is no support or evidence from the experiments. This paper deals with presenting the various models as well as experimental investigations that have already been conducted by some of the researchers to study the exposure of self-compacting concrete to crack.

show abstract

Determination of size-independent specific fracture energy of normal- and high-strength self-compacting concrete from wedge splitting tests

Cited by 58 publications

References 18 publications

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

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

Stochastic fracture‐mechanical parameters for the performance‐based design of concrete structures

A Review on Studies of Fracture Parameters of Self-compacting Concrete

Contact Info

Product

Resources

About