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    Determination of tensile strength of cementitious composites using fracture parameters of two-parameter model for concrete fracture
    (Elsevier, 2022) İnce, Ragıp; Fenerli, Cenk
    In this study, the formulation of the two-parameter model based on the size effect proposed by previous researchers was initially improved to be much more practical. Subsequently, six series of notched and unnotched beams with a size ratio of 1:4 and notched and unnotched square prismatic specimens with a size ratio of 1:6 were tested to verify this modified formulation. The peak loads obtained from the fracture tests of the notched specimens were examined using the two-parameter model. Then, the test results of the unnotched bending and splitting specimens were simulated according to the modified formulation. Furthermore, this formulation was applied to extensive test data obtained from the direct tension specimens with double edge notches and from the unnotched specimens in the literature to derive the direct tensile strength of concrete. Finally, when comparing the results of this study to the previous studies, there were slight differences among the other formulas, except for the one that covered splitting specimens.
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    Effect of fly ash and marble powder on and flow properties and compressional strength of grouts
    (Baski, 2019) Sis, Hikmet; Kıyak, Tufan; Fenerli, Cenk; Genç, Mehmet
    Coal fly-ash and marble powders are two environmentally important industrial waste materials that should be utilized. It is known that they are used as additives in concrete production for many years. In this study, the usability of fly-ash and marble powder in grout production was investigated. Flyash and marble powder utilized in the tests were obtained from Soma (Manisa) power plant and Akçadag (Malatya) region, respectively. Pozzalanic fly-ash and reactive marble powder were used in grout mixtures as partial replacement materials for cement and aggregate, respectively. Flow and strength properties of the grouts prepared at different water/cement ratios were tested and the effect of the additives were determined. Rheological properties of the mixtures were tested at a wide range of shear stress-shear rate by utilizing a rheometer. Additionally, the prepared mixtures were cast into moulds and the 28 day strength of the cubes were determined by uniaxial compression tests. Test results showed that the increasing water/cement ratio increased the fluidity the grout mixtures, but inversely affected the strength of hardened grouts. The results showed that addition of fly ash decreased the 28 days strength of hardened grout by improved the fluidity of fresh grout to some extend. On the other hand, marble powder decreased the fluidity of mixtures but increased the strength of hardened grout significantly. Copyright © IMCET 2019 International Mining Congress and Exhibition of Turkey. All rights reserved.
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    Residual strength prediction based on size effect of cracked concrete members
    (ICE Publishing, 2021) İnce, Ragıp; Fenerli, Cenk
    In engineering materials, defects, such as cracks, may occur during production and/or owing to various reasons. One of the aims of fracture mechanics is to determine the fracture toughness-based residual strength of structural members with cracks. A quasi-brittle material, such as concrete or rock, may include certain defects, such as voids and cracks, even before being exposed to loads. Experimental analyses on concrete members indicated that specimens’ nominal strength values decreased as their sizes increased while specimen geometry remained the same. In fracture mechanics, this condition is defined as the ‘size effect’ in both concrete and reinforced concrete units. In the literature, numerous theoretical and experimental studies have been conducted on beams, while compact split-tension specimens, particularly notched ones, are limited. In this study, six series of notched beams with three different sizes and notched square prismatic specimens with four different sizes were tested. According to the test results, the peak loads were analysed by using the fundamental theorem of the modified size effect law. In conclusion, two formulae were proposed to predict the flexural strength and the splitting strength of quasi-brittle bodies with cracks.