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    Influence of waste aggregate type on the mechanical strength and durability of slag-rice husk ash-based geopolymer composites
    (Taylor & Francis Ltd, 2025) Benlioglu, Arif; Demirel, Mertcan; Altun, Muhammet Gokhan; Ozen, Suleyman
    This study explores the utilization of construction and demolition waste (CDW), ceramic waste (CW), and marble waste (MW) as partial sand replacements in geopolymer mortars produced with granulated blast furnace slag (GBFS) and rice husk ash (RHA). Mortars were prepared with 75% GBFS and 25% RHA, activated using sodium silicate and 12 M sodium hydroxide, and cured at ambient conditions for 28 days. Waste aggregates were substituted at 10%, 20%, and 30%, while mix ratios were kept constant. Hardened properties, drying shrinkage, and high-temperature performance (300 and 600 degrees C) were evaluated, alongside microstructural analyses (X-ray diffraction, scanning electron microscopy, thermogravimetric analysis/derivative thermogravimetric). Results showed MW10 achieved the highest compressive strength with an increase of 27%, while CW20 exhibited the best flexural strength with an increase of 8%. CW and MW reduced drying shrinkage, whereas CDW increased it and caused significant strength loss at elevated temperatures. Combining waste aggregates with industrial by-products boosts sustainability and performance.
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    Öğe
    Materials characterization of historical structures: A review
    (Higher Education Press, 2025) Demirel, Mertcan; Topsakal, Alican; Altun, Muhammet Gokhan
    The protection of historical artifacts that hold great significance in the fields of art, architecture, history, and culture ensures the preservation of cultural heritage and safeguards the shared past of humanity. Proper material selection and appropriate application methods are crucial for maintaining the aesthetic and structural integrity of historical structures and ensuring their transmission to future generations. Understanding the composition and properties of these materials is essential for making the right material choices in restoration processes. This study aims to provide a detailed evaluation of analytical methods used in the characterization of historical building materials and to synthesize the existing findings in the literature in a coherent manner. At the same time, it aims to provide a guide for researchers in the field in choosing the methodology by revealing the strengths and limitations of these techniques. Thus, it will contribute to the establishment of a data-based basis for future scientific studies. In this context, the objectives of the methods used to determine the properties of historical building materials, the processes of sampling and preparing materials for testing, the characteristics of the devices used in the tests, as well as the obtained analysis results and evaluations were reviewed.