Effect of type of coarse aggregate on the strength properties and fracture energy of normal and high strength concrete

Vishalakshi, K.P.; Revathi, V.; Reddy, Sekhar

doi:10.1016/j.engfracmech.2018.02.029

Cited by 66 publications

(21 citation statements)

References 20 publications

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“…In order to study and validate the proposed framework, firstly dog-bone shape specimens subjected to tensile load were simulated, at first varying the type of aggregates and, later, varying the fracture properties of the ITZ, using the two aggregate shapes proposed. The results showed that [46] both aggregate types and ITZ significantly affect the HSC fracture behavior in mesoscale, in accordance with literature references [8,17,54]. In an inadequate situation where low-quality aggregates are used, the crack propagation breaking through the aggregates are predominant culminating in a very tortuous predominant crack, since the coarse aggregates are the weakest phase of the composite, which contributes negatively to the ultimate tensile strength of the specimen.…”

Section: Discussionsupporting

confidence: 88%

2D Crack Propagation in High-Strength Concrete Using Multiscale Modeling

Gimenes

Rodrigues

Maedo

et al. 2020

Multiscale Sci. Eng.

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In this work a concurrent multiscale (macro and mesoscale) approach for high-strength concrete (HSC) is proposed for seeking to better understand the influence of coarse aggregate type, shape, and size distribution as well as the interfacial transition zone (ITZ) effects on the fracture mechanical responses. A linear elastic model with homogenized elastic properties is used for the macroscale, while a three-phase material composed of coarse aggregates, mortar matrix and the ITZ equipped with nonlinear behavior models are assumed for the mesoscopic level. To geometrically represent and gain insights into effects of coarse aggregates, two polygonal shapes are assumed: irregular quadrilateral and regular octagonal forms, which are used separated and randomly generated from a given grading curve and placed in the mesoscale region using the "take-and-place" method. A mesh fragmentation technique is used to explicitly represent the crack propagation process by considering the individual behavior of each phase as well as their mutual interactions. The non-matching macro and mesoscopic meshes are attached based on the use of coupling finite elements in the context of the rigid coupling scheme to adequately guarantee the continuity of displacement between both scales. Numerical analyses of dog-bone shape specimens under tensile load and three-point bending beams were performed. The responses obtained numerically show a good agreement with experimental ones found in literature demonstrating how the proposed approach is efficient, robust and useful for modeling crack propagation in HSC.

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Section: Discussionsupporting

confidence: 88%

2D Crack Propagation in High-Strength Concrete Using Multiscale Modeling

Gimenes

Rodrigues

Maedo

et al. 2020

Multiscale Sci. Eng.

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“…The Young's modulus was obtained from Equation (10) by using f c = 106.2 MPa is E = 40.91 GPa. However, the measured/calculated values of E were lower than expected with respect to compressive strength according to 3 -an absence of the coarse aggregates could be a reason. The indirect tensile strength on an unnotched Brazilian disc test 4 was measured using three samples.…”

Section: Mechanical Characteristics Of the Hpccontrasting

confidence: 61%

Mixed-mode fracture analysis in high-performance concrete using a Brazilian disc test

Miarka¹,

Seitl²,

Bílek³

2019

Mater. Tehnol.

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This paper reports and discusses the results of an experimental investigation into the fracture mechanical properties of high-performance concrete (HPC) with a compressive strength higher than 100 MPa. In total, 6 specimens for a three-point bending test and 12 specimens of a Brazilian disc under a mixed-mode load were included in the experimental measurements. The fracture toughness was evaluated for mode I in the case of a three-point bend test and a Brazilian disc test, allowing a correlation between two geometrically different specimens. The fracture resistance under mixed mode I/II was analysed using the Brazilian disc test specimen with a central notch. To evaluate the fracture resistance under the mixed mode a generalised maximum tangential stress criterion was employed and the value of the critical distance rC is discussed as an appropriate HPC material characteristic. The last objective of this study was to provide some experimental data that can be useful in engineering practice for calibrating numerical constitutive models.Avtorji poro~ajo in razpravljajo o eksperimentalnih raziskavah lomno-mehanskih lastnosti visokokakovostnega betona (HPC; angl.: High Performance Concrete) s tla~no trdnostjo nad 100 MPa. V kompletu so izvedli trito~kovne upogibne preizkuse na {estih (6) vzorcih in na dvanajstih (12) vzorcih v obliki diskov so izvedli brazilski preizkus, ki predstavlja me{ano (natezno/tla~no) obremenitev. Dolo~ili so lomno`ilavost za na~in I v obeh primerih; to je trito~kovnega upogibnega preizkusa in brazilskega testa, upo{tevajo~geometrijske lastnosti obeh vrst vzorcev. Odpornost proti lomu v me{anem na~inu I/II so analizirali s pomo~jo brazilskega preizkusa na vzorcih (diskih) s centralno zarezo. Da bi ovrednotili odpornost proti lomu v me{anem na~inu, so uporabili posplo{eni kriterij maksimalne tangencialne napetosti in ocenili, da je vrednost kriti~ne razdalje primeren kriterij za oceno lastnosti HPC. V zadnjem delu te {tudije so podali nekaj eksperimentalnih podatkov, ki bi lahko bili uporabni v in`enirski praksi za kalibracijo numeri~nih konstitutivnih modelov.

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“…In addition to the shape and surface roughness of the aggregates affecting the performance of the asphalt mixture, the mechanical properties of the aggregates also influenced the mixture cracking resistance, which has attracted the attention of researchers. Vishalakshia et al [17] performed tests to comparatively evaluate the strength and cracking behavior of ordinary and high-strength concrete containing five different types of aggregates. The aggregate type was found to strongly influence the strength of high-strength concrete, but had no significant influence on ordinary-strength concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Influence of Aggregate Strength on the Flexural Cracking Behavior of Epoxy Asphalt Mixtures

Wei

et al. 2020

Materials

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The flexural cracking resistance of an asphalt concrete mixture used in a steel bridge deck pavement needs to be higher than that of one used in ordinary pavement. In this study, mechanical experimental tests were used to evaluate the influence of the aggregate strength on the flexural cracking behavior of epoxy asphalt concrete (EAC). The aggregate fracture area of beam cross sections was quantitatively analyzed by digital image processing, and crack propagation in the mixture was analyzed using fracture mechanics theory. The bending test results showed that the EAC containing high-strength aggregates exhibited the highest flexural cracking resistance among all of the aggregate mixtures under the same conditions. The use of high-strength aggregates led to a reduction in the aggregate fracture area, thereby improving the flexural cracking resistance of the mixture. The aggregate strength had a significant influence on the flexural cracking propagation behavior of the mixture. Fatigue test results at strain-controlled levels of 600–1200 με and 15 °C showed that the aggregate strength had no evident influence on the fatigue properties of the EAC. It is recommended that high-strength aggregates are used to increase the fracture resistance of aggregates and the flexural crack resistance of EACs.

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Effect of type of coarse aggregate on the strength properties and fracture energy of normal and high strength concrete

Cited by 66 publications

References 20 publications

2D Crack Propagation in High-Strength Concrete Using Multiscale Modeling

2D Crack Propagation in High-Strength Concrete Using Multiscale Modeling

Mixed-mode fracture analysis in high-performance concrete using a Brazilian disc test

Experimental Evaluation of the Influence of Aggregate Strength on the Flexural Cracking Behavior of Epoxy Asphalt Mixtures

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