Browsing by Author "Erdogmus, E"

Now showing 1 - 7 of 7
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    Study of the effect of construction techniques on the seismic capacity of ancient dry-joint masonry towers through DEM
    Pulatsu, B; Gencer, F; Erdogmus, E
    This paper investigates the seismic capacity and collapse mechanism of dry-joint masonry towers built with different ancient construction techniques at the Caria and Pamphylia regions in Turkey. A discontinuum type of analysis is performed, where masonry towers are represented as a system of individual rigid blocks based on the discrete element method (DEM). The dimensions and the morphology of the masonry towers are obtained in-situ and then utilized in the computational models. Therefore, the wall cross-section morphologies reflected in the numerical models are accurate and authentic. The motion and mechanical interaction of blocks are computed by integrating the equations of motion and point contact approach based on the relative contact displacement, respectively. The seismic capacity and behavior of masonry towers are analyzed by subjecting them to increasing horizontal forces applied in different orientations. Once the modeling strategy is validated, it is further utilized to better understand the local and global failure mechanisms of ancient masonry towers constructed with different masonry bond patterns. The results of this study highlight the importance of workmanship for the dry-joint masonry structures and underline the significance of the geometrical properties in ancient constructions that influence both the capacity and collapse mechanism.
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    Preparation and performance evaluation of waste tuff-modified bricks for sustainable built environment: Effect of firing temperature and molding pressure
    Sutcu, M; Faisal, MS; Danish, A; Erdogmus, E; Gencel, O; Ozbakkaloglu, T
    The research covers an extensive array of analyses, encompassing physical, microstructural, thermal, mechanical, and durability evaluations, to unravel the properties and characteristics of waste tuff (WT)-based bricks under different firing temperatures and molding pressures. Mechanical testing, specifically compressive strength evaluation, highlighted the significant influence of firing temperature and molding pressure, with increased strength observed at elevated temperatures and pressures. However, assessing the impact of freeze-thaw cycles, it was observed that the freeze-thaw cycles led to a minor reduction in compressive strength, particularly noticeable at lower firing temperatures. The results suggest that the most favorable firing temperature and molding pressure for minimizing linear shrinkage, decreasing apparent porosity and water absorption, achieving a desirable bulk density, optimizing thermal conductivity, and attaining satisfactory compressive strength along with better resistance to freeze-thaw cycles in WT-modified bricks, are 1100(degrees)C and 60 MPa, respectively. The promising findings of this study will help promote the production of bricks using WT, resulting in sustainable management and reduced accumulation of WT.
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    Enhancing thermal efficiency and durability of sintered clay bricks through incorporation of polymeric waste materials
    Erdogmus, E; Sutcu, M; Gencel, O; Kazmi, SMS; Munir, MJ; Velasco, PM; Ozbakkaloglu, T
    This pioneering study investigates the use of expanded polystyrene (EPS) and waste rubber tyre powder (WRTP) in sintered clay bricks for eco-friendly and cleaner buildings. Different ratios of EPS and WRTP were mixed with clay and sintered at 1000 degrees C. Advanced material characterization techniques were used to evaluate the materials, and physical, mechanical, and durability tests were performed on the bricks. The findings show that higher doses of EPS and WRTP increased the bricks' thermal efficiency and reduced their weight. Brick specimens with 0.5% EPS dosage met the weathering resistance requirements, and those with 0.5% EPS dosage and 5% WRTP dosage met the minimum compressive strength standards. The study offers valuable insights into the potential appli-cations of EPS and WRTP in producing clean and sustainable polymer waste bricks to improve brick performance and efficient waste management in the construction industry.
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    Effect of molding pressure and firing temperature on the properties of ceramics from natural zeolite
    Erdogmus, E; Sutcu, M; Hossain, S; Bayram, M; Sari, A; Gencel, O; Ozbakkaloglu, T
    In recent years, there has been growing interest in eco-friendly and sustainable construction materials that reduce environmental impact while maintaining high-performance standards. The brick industry, in particular, is under pressure to develop solutions that incorporate waste and natural-based materials, reducing reliance on traditional energy-intensive manufacturing processes. In response, this study explores the fabrication of ceramic bricks using naturally occurring zeolite, which is widely available and offers promising properties for use in construction. The ceramic matrix is made with natural zeolite and water, pressed at three different pressures, and fired at three different temperatures. The study investigates the impact of varying molding pressures and firing temperatures on the microstructural and mechanical properties of ceramic bricks made with natural zeolite. XRF and XRD techniques were used to analyze the raw material's chemical composition, and TGA tests were conducted to evaluate the bricks' chemical stability. The study finds that the compressive strength of zeolite bricks molded at 15 MPa pressure and fired at 900 & DEG;C increased from 7.1 MPa to 51.2 MPa when fired at 1100 & DEG;C. Increasing the molding pressure led to a higher compressive strength of the specimens, but the effect was minimal compared to the influence of firing temperature on the compressive strength. The apparent porosity and water absorption of the bricks decreased with increasing molding pressure and firing temperature. Further, clinoptilolite, a zeolite phase, decomposes during firing and transforms into silica polymorphs, feldspathic phases, and glassy phases. As the molding pressure increased, the irregular-shaped pores in the brick specimens decreased. Moreover, the density of the bricks increased with the firing temperature due to sintering between particles in the microstructure. By investigating the impact of molding pressure and firing temperature on the microstructural and mechanical properties of these eco-friendly bricks, this study offers insight into a potential solution for sustainable construction practices. By investigating the impact of pressing pressure and firing temperature on the microstructural and mechanical properties of these eco-friendly bricks, this study demonstrated that optimizing firing temperature and pressing pressure can significantly improve the physical and mechanical properties of zeolite bricks, including bulk density, compressive strength, water absorption, and porosity, while also reducing the environmental impact of the production process. Thus, this study offers insight into a potential solution for sustainable construction practices.
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    Phase change material incorporated paper pulp sludge/gypsum composite reinforced by slag and fly ash for energy efficient buildings: Solar thermal regulation, embody energy, sustainability index and cost analysis
    Kucukdogan, N; Sutcu, M; Ozturk, S; Yaprak, H; Memis, S; Gencel, O; Ustaoglu, A; Sari, A; Hekimoglu, G; Erdogmus, E
    This study focuses on the reuse of some industrial wastes in the development of innovative building materials and the thermal performance, environmental impacts and cost estimates of the gypsum composite material developed in the case of a phase change material impregnation. Lauryl alcohol (LA) was impregnated into paper pulp sludge (PPS) up to 45 % by weight without leakage to obtain shape-stable composites. The LA impregnated PPS (PPS/ LA) was replaced with PPS at 50 % and 100 % by weight in gypsum composite. Characteristics of shape-stable composites were studied. Also, the physical, mechanical, thermal properties and solar thermoregulation tests of the produced gypsum composites were examined in addition to the embodied energy, CO2 emissions and cost analysis. The melting and solidification enthalpies of PPS/LA were found to be 100.4-100.1 J/g, with only a 0.5 % reduction in latent heat storage capacity after 500 cycles, and approximately 3 % after 1500 cycles. Although the presence of PPS/LA in the gypsum composite caused a slight decrease in compressive strength, it significantly improved solar thermoregulation performance, maintaining ambient temperatures 2.55 degrees C to 5 degrees C warmer at night and 5.3 degrees C to 13.8 degrees C cooler during the day. Gypsum composites containing the PPS/LA offer a suitable alternative for energy-efficient sustainable building application by reusing around 57 % of three different industrial wastes providing a waste-reducing environmental approach and a high level of indoor thermal comfort.
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    Influence of colemanite admixture on Portland cement durability
    Erdogmus, E; Targan, S; Erdogan, Y; Avciata, U; Gencel, O
    In this study, the compressive strength of mortar prepared by Portland cement (PC) and different proportions of blast furnace slag, fly ash and colemanite concentrator waste was examined at the end of the 2nd, 7th, 28th, 60th and 90th days. Moreover, some mortars were kept in 50 g/l sodium sulfate (Na2SO4) solution according to ASTM C1012 for 6 months to determine their sulfate resistance. The first length of some mortars made with alkali reactive sand together with additives mentioned above or PC according to ASTM C1260 was measured to detect their alkali-aggregate reaction resistance and then their final lengths were measured after being kept in 1 M sodium hydroxide (NaOH) solution at a temperature of 80 degrees C for 14 days. The results were compared both among themselves and with Portland cement. In addition, the microstructures of some samples scanned by scanning electron microscopy were photographed. It was found that all the additives had positive effects on sulfate and ASR resistance.
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    Influence of tea waste concentration in the physical, mechanical and thermal properties of brick clay mixtures
    Ozturk, S; Sutcu, M; Erdogmus, E; Gencel, O
    The sustainability of raw materials used in construction industry consumed large quantities of material has great importance. The use of pore-makers in the brick production is reducing the consumption of clean clay resources as well as lightness of the baked brick body. Many organic or inorganic additives have been used as pore-making in brick production for improving thermal performance. In this study, tea waste (TW) were used at different concentrations in the brick clay mixtures to examine its effects on baked brick properties. In addition to micro-structure investigations, physical, mechanical and thermal properties of bricks produced were investigated. It is concluded that tea waste additive up to 10% in brick body can be used for structural application and isolation while ratios more 10% tea waste additive for only isolation purposes. Tea wastes can be used as a pore-making additive in the brick production. (C) 2019 Elsevier Ltd. All rights reserved.