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    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.
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    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.
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    Engineering properties of different fiber-reinforced metakaolin-red mud based geopolymer mortars
    (Elsevier Sci Ltd, 2023) Nazir, Khizar; Canpolat, Orhan; Uysal, Mucteba; Nis, Anil; Kuranli, Omer Faruk
    In this research, fiber reinforced metakaolin-red mud based geopolymer mortar was produced by using recycled concrete aggregate and industrial waste glass powder as filler materials. Three different types of fibers were used to reinforce the geopolymer mortar, namely brass-coated steel fibers, polyamide fibers, and polyethylene fibers, with four different proportions by volume (0.25%, 0.5%, 0.75%, and 1.00%). Experiments for compressive strength, flexural strength, splitting tensile strength, flexural toughness factor, ultrasonic pulse velocity, and abrasion resistance were conducted to investigate the influence of fibers on mechanical properties. Specific gravity, porosity, and water absorption tests were conducted to examine the physical properties. Additionally, Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) analyses were performed. The results indicate that 50% replacement of recycled concrete aggregate and glass powder as filler material yielded the optimum strength properties. Moreover, addition of fibers enhanced the strength properties of the geopolymer mortar, for instance, the mixture having polyethylene fibers with a fiber volume of 0.75% improved the flexural strength up to 48.72%, and the mixture containing steel fibers with a fiber fraction of 0.25% showed the highest value of splitting tensile strength and improved up to 40% when compared to non-fibrous control mixture. Polyethylene fiber-reinforced mixture showed a notable toughening impact and showed a flexural toughness factor up to 66.29% more than the control sample. The reason of this improvement is because of the bridging effect of fibers. According to the findings, the 0.25% steel fibrous samples showed the best result in terms of minimum weight loss due to abrasion and showed 36.08% more abrasion resistance compared to non-fibrous control mixture. Moreover, increase in porosity was observed in fiber-reinforced mixtures. The lack of CaO content is found responsible for poor mechanical strength and bending performance of fibrous metakaolin-red mud based geo-polymer mortars specimens.
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    Fly ash based geopolymer composites partially replaced with silica fume: An experimental investigation
    (International Committee of the SCMT conferences, 2019) Al-Mashhadani, Mukhallad M.; Canpolat, Orhan; Aygörmez, Yurdakul; Uysal, Mucteba; Sahin, Furkan
    Nowadays, the environmental impact which is caused by the industrial development specially in construction section have led to an increasing interest in geopolymer field and thereby have promoted the research in terms of full replacement of Portland cement binder and feasible utilization of waste materials. In this paper, an attempt was done to fabricate a binding matrix that is totally cement free and based on eco-friendly materials. The effect of adding silica fume on strength properties, physical properties and resistance to abrasion were studied. In general, silica fume was found to enhance the investigated properties due to the fineness of silica fume particles which generally formed geopolymeric composites with more compact matrix. The geopolymeric matrix which is fabricated with the presence of silica fume has shown an obvious improvement in terms of physical properties. Moreover, the compactness of the matrix led to a good performance regarding the abrasion resistance, to be more specific, the abraded surface was more resistant to weight loss after adding silica fume. In addition to that, an acceptable degree of correlation was obtained when the results of the studied properties were linked, results from strength tests and the ones from non-destructive tests were having a good degree of correlation. © 2019 International Committee of the SCMT conferences. All rights reserved.
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    Recycling of various types of slags as SCMs and aggregates
    (Elsevier, 2024) Kuranlı, Ömer Faruk; Bayram, Muhammed; Niş, Anıl; Uysal, Mucteba; Ozbakkaloglu, Togay
    This chapter presents a comprehensive overview of the utilization of various types of slag as both aggregates and supplementary cementitious materials (SCMs), while delving into the associated benefits. This chapter extensively examines the research conducted on different slag types, thoroughly analyzing their microstructural, mechanical, and durability characteristics, in addition to highlighting their environmental advantages. Emphasis is placed on how such utilization plays a pivotal role in advancing sustainability within the construction industry by integrating diverse slag applications into cementitious materials. Furthermore, the reclamation of slags for use as aggregates not only contributes to efficient waste management but also conserves valuable resources, thus fostering the principles of a circular economy. The chapter notably underscores the pivotal significance of slag in elevating the overall sustainability of the industrial sector. It offers insights into the prevailing trends within slag-based materials for cement production, catering to the needs of both academia by providing a comprehensive understanding of diverse slag applications, and professionals seeking to enhance their knowledge in this domain. This chapter distinctly emphasizes how the strategic integration of slag resources drives the adoption of sustainable practices, thereby advocating for continued research and exploration in this promising field. © 2024 Elsevier Inc. All rights are reserved including those for text and data mining AI training and similar technologies.
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    Using different types of aggregates including waste concrete in the production of geopolymer mortars
    (International Committee of the SCMT conferences, 2019) Canpolat, Orhan; Şahin, Furkan; Uysal, Mucteba; Al-Mashhadani, Mukhallad M.; Aygörmez, Yurdakul
    In developed and developing countries, the need for industrial and residential buildings is constantly increasing. The old buildings are either demolished or replaced by new buildings in order to maintain environmental awareness and due to limited usage areas. In this construction process, traditional Portland cement is used and also a serious solid waste problem arises due to the demolished buildings. Because of using Portland cement, a significant amount of greenhouse gas production is generated, as well as high levels of environmental pollution due to the accumulation of concrete solid wastes. New laws have been enacted in many countries to reduce greenhouse gas emissions due to Portland cement and for solid waste management, and even the establishment of recycling facilities for waste concrete has been encouraged. The reduction of greenhouse gas emissions and recycling of construction wastes have gained great importance both because of the protection of the natural environment and its contribution to the economy.In this study, more environmentally friendly geopolymer additives were used instead of traditional Portland cement for the recycling of construction waste, as well as geopolymer mortars were produced with different types of aggregates. The 0.4% basalt fiber additive series of the obtained samples were similarly produced. The geopolymer samples produced by using different aggregate types including the waste concrete aggregate were compared in terms of 28 days compressive strengths, ultrasound velocities, unit weight, voids ratio and water absorption results. © 2019 International Committee of the SCMT conferences. All rights reserved.