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    Effect of Supplementary Cementitious Materials with Similar Specific Surface Area on Cementitious Composite Systems
    (Amer Soc Testing Materials, 2023) Sevim, Ozer; Sengul, Cagri Goktug; Kartal, Saruhan; Toklu, Kenan; Caglar, Yasin
    This study investigated the effect of the mechanical and durability properties of cementitious composite systems with supplementary cementitious materials (SCMs), including fly ash (FA), ground granulated blast furnace slag (GGBS), and bottom ash (BA), with similar specific surface areas (similar to 3,300 cm2/g). FA, GGBS, and BA were ground to a specific surface area of similar to 3,300 cm2/g (about the cement-specific surface area) and then replaced with cement at 5 %, 10 %, 15 %, and 20 % replacement ratios. The compressive strength, flexural strength, length change, and rapid chloride ion permeability of the cementitious composites incorporating FA, GGBS, and BA with similar specific surface areas were recorded after 7-, 28-, and 90-day curing periods. As a result, cementitious composites containing GGBS improved the mechanical and durability properties at the maximum rate. It was shown that the properties of cementitious composites containing 20 % GGBS yielded better results than the control specimens without any SCMs.
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    Recovery Of Phosphogypsum In Economy In Building Materialwaste
    (Gazi Univ, Fac Engineering Architecture, 2015) Demirel, Yusuf; Caglar, Yasin
    Phosphogypsum, the storage of which damages the ecological balance, has limited use due to its contamination aspect. However, it is possible to eliminate its impurities through raffination methods, such as washing and calcination. This study, examines ways of pollution prevention caused by waste phosphogypsum in Turkey and its recycling methods of building materials and winning for economics. A number of physical analysis were conducted on the natural gypsum, phosphogypsum, and the mixture of phosphogypsum and natural gypsum with specific proportions. These physical analysis on the abone mentioned three materials are determination of crystal water, sieve analysis, determination of set duration and flow diameter, Ph determination, the amount of moisture content determination, determination of flexural and axial compressive strength. The proportional mixture of phosphogypsum and natural gypsum are determined according to their Ph degrees. While natural gypsum has a Ph degree of 6-7, phosphogypsum has 3. Due to asidic characteristic of the latter, and its related limited use as a consturction material, proportional use of phosphogypsum is found to be more efficient. In order to measure Ph balance and its granulometer, various mixtures are prepared. The most appropriate blend is found to be 15% phosphogypsum and 85% natural gypsum. Axial compressive strength and flexural strength tests were conducted, setting duration has been taken into account, outdoor use as construction material and its cost have been discussed.
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    Size effect tests of different notch depth specimens with support rotation measurements
    (Pergamon-Elsevier Science Ltd, 2016) Caglar, Yasin; Sener, Siddik
    Test results from a Type I & II size effect experimental study on notched and un-notched beams are presented in this paper. The test specimens were geometrically similar but had different scale ratios and different notch length ratios of 0, 0.02, 0.075, 0.15 and 0.3. The specimens had rectangular cross sections with constant thickness of 40 mm and the depth varied from 40 mm to 500 mm corresponding to a scale ratio of 1:12.5. Rotations measured at support locations for each specimen are presented to reinforce the experimental findings. It was observed that all specimens with different notch-to-length ratios exhibited size effect, in which the stress at maximum load (failure load divided by cross-sectional area) decreased as the size was increased. The results indicate that the failure is governed by fracture mechanics principles. This phenomenon is not addressed in current design codes, which do not account for such size effect. The test results showed that beams with shallow notch exhibit Type I, beams with deep notch exhibit Type II size effect law. The test results compared favorably with several widely accepted size effect models. (C) 2016 Elsevier Ltd. All rights reserved.
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    Vertical Displacements of Komurhan Bridge
    (Turkish Chamber Civil Engineers, 2016) Sener, Siddik; Caglar, Yasin
    In this study, displacements and stress distribution under vertical loads of Komurhan Bridge that is built by balanced cantilever method for the first time in Turkey were determined. For this purpose ANSYS software is used and the real behaviour of the bridge is created with the finite elements model by taking into account the material properties and the boundary conditions. The main span of the Komurhan Bridge is 143.50m, symmetric with prestressed box section whose end supports are located on the shore. The displacements obtained by the finite elements model of the bridge and those measured at the cantilever end under the truck load are found to be very close. The displacements, normal and shear stresses were obtained for the model which represents the real behavior of the bridge under excessive loadings. Excessive displacements, normal and shear stress at the critical cross sections are important for the safety of the bridge.