Yazar "Tammam, Yosra" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ N/A ]
    Öğe
    Durability properties of fly ash-based geopolymer mortars with different quarry waste fillers
    (Techno-Press, 2022) Tammam, Yosra; Uysal, Mucteba; Canpolat, Orhan
    Geopolymers are an important alternative material supporting recycling, sustainability, and waste management. Durability properties are among the most critical parameters to be investigated; in this study, the durability of manufactured geopolymer samples under the attack of 10% magnesium sulfate and 10% sodium sulfate solution was investigated. 180 cycles of freezing and thawing were also tested. The experimentally obtained results investigate the durability of geopolymer mortar prepared with fly ash (class F) and alkali activator. Three different quarry dust wastes replaced the river sand aggregate: limestone, marble, and basalt powder as fine filler aggregate in three different replacement ratios of 25%, 50%, and 75% to produce ten series of geopolymer composites. The geopolymer samples??? visual appearance, weight changes, UPV, and strength properties were studied for up to 12 months at different time intervals of exposure to sulfate solutions to investigate sulfate resistance. In addition, Scanning Electron Microscopy (SEM), EDS, and XRD were used to study the microstructure of the samples. It was beneficial to include quarry waste as a filler aggregate in durability and mechanical properties. The compact matrix was demonstrated by microstructural analysis of the manufactured specimens. The geopolymer mortars immersed in sodium sulfate showed less strength reduction and deterioration than magnesium sulfate, indicating that magnesium sulfate is more aggressive than sodium sulfate. Therefore, it is concluded that using waste dust interrogation with partial replacement of river sand with fly ash-based geopolymers has satisfactory results in terms of durability properties of freeze-thaw and sulfate resistance.
  • Küçük Resim
    Öğe
    Effect of Waste Filler Materials and Recycled Waste Aggregates on the Production of Geopolymer Composites
    (Springer Heidelberg, 2023) Tammam, Yosra; Uysal, Mucteba; Canpolat, Orhan; Kuranli, Omer Faruk
    In this research, the performance of fly ash/GGBS geopolymer mortars made with different quarry waste powder as filler materials by substituting the fine recycled aggregate (RS) with different ratios. Also, it was evaluated based on mechanical, physical, freeze-thaw, and microstructural analysis. Limestone waste (L), marble waste (M), and basalt waste powder (B) were used as filler materials developing eco-friendly and economical geopolymer from industrial waste as a promising sustainable area of research. Strength properties, ultrasonic pulse velocity, physical properties, freeze-thaw, XRD, and SEM analysis of geopolymer samples were investigated. The results revealed that using waste filler materials together with recycled aggregate effectively improves the mechanical properties of geopolymer composites substituting three different filling materials affected water absorption positively, strength properties, and freeze-thaw results. Current findings point to a potential solution. Successful use of fly ash, slag, recycled aggregate, and quarry waste has been achieved. The output of the study is expected to result in effective and environmentally friendly management of recycled wastes.
  • Küçük Resim
    Öğe
    Influence of various fibers on the physico-mechanical properties of a sustainable geopolymer mortar-based on metakaolin and slag
    (Elsevier - Division Reed Elsevier India Pvt Ltd, 2023) Ziada, Mahmoud; Erdem, Savas; Gonzalez-Lezcano, Roberto Alonso; Tammam, Yosra; Unkar, Irem
    Recently, studies on sustainability and ecology have become widespread in almost all sectors. One of the most important reasons for this spread is the rapid increase in industrialization and, thus, the increase in waste caused by industries. In this context, significant efforts are being made to evaluate some of these wastes. One of these efforts is the production of geopolymers. In this research, metakaolin and slag-based geopolymer mortar samples were manufactured, and polyvinyl Alcohol, basalt, and macro synthetic polypropylene fibers were used to enhance the physical, mechanical, and high-temperature resistance of the sample. Physical and mechanical tests of the produced samples were performed after 28 days. Then, elevated-temperature experiments were conducted to evaluate the behavior of the fibers under the influence of high temperature. Following the high-temperature test, physical, mechanical and microstructure tests of the samples were performed. As a result, basalt fiber enhanced the compressive strength of 800 degrees C-exposed samples by 7.72% compared to the fiber-free sample. Also, polyvinyl Alcohol fiber increased the energy absorption capacity of the samples by increasing Charpy impact values to 72.22% compared to fiber-free sample. Moreover, macro synthetic polypropylene fiber reduced capillary water absorption value up to 12.44% compared to fiber-free sample.