MDMerve Demirel

Merve Demirel

*This is an algorithmically generated author record based on publicly available information.

Current Organizations / Institutes

The organizations/institutes from the scholar's latest article


Merve Demirel has a total of 3 co-authors. Here are the top co-authors by number of shared publications:


Latest Publications

  • Open Access

    Sustainable Geopolymer Synthesis from Calcined Pumice: Reactivity, Mechanical Performance, and Water Resistance

    by Cemal Karaaslan, Engin Yener, Merve Demirel, Anıl Niş

    This study investigates the feasibility of using calcined pumice as a sustainable precursor for geopolymer production. Natural pumice was calcined at different temperatures (600, 750, and 900 °C) and durations (1, 2, and 4 h). The effects of calcination were evaluated through color change, particle size distribution, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. The results showed that calcination induced structural and mineralogical modifications in pumice, including increased disorder in the aluminosilicate network and partial recrystallization, which enhanced its reactivity. Consequently, geopolymer mortars produced with calcined pumice exhibited significantly improved compressive strength, with the highest strength of 53.5 MPa obtained for the sample calcined at 750 °C for 1 h, corresponding to an 84.5% increase compared to the mortar produced with raw pumice. In addition, calcination at 600 °C and 900 °C significantly improved water resistance. Considering mechanical performance, durability-related properties, and energy efficiency together, the calcination condition of 600 °C for 2 h was identified as the optimum treatment. These findings demonstrate that calcined pumice is a promising and sustainable precursor for geopolymer production.


  • Alkali-Füzyon Yöntemiyle Aktive Edilen Volkanik Küller ile Geopolimer Üretimi

    by Merve Demirel, Cemal Karaaslan

    Bu çalışmada, alkali-füzyon işlemine tabi tutulan volkanik küllerin geopolimer üretiminde toz bağlayıcı olarak kullanılabilirliği ve bu yöntemin etkinliği araştırılmıştır. Bu kapsamda, volkanik kül ile toz haline getirilmiş NaOH belirli oranlarda karıştırılarak yüksek sıcaklıkta alkali-füzyon işlemi uygulanmıştır. NaOH’nin volkanik küle ağırlıkça oranı 0.6, 0.8 ve 1.0 olarak belirlenmiştir. Her oran için kalsinasyon işlemi 550 °C ve 700 °C sıcaklıklarda ayrı ayrı gerçekleştirilmiştir. Böylece toplam altı farklı alkali-füzyona uğramış volkanik kül elde edilmiştir. Elde edilen bu volkanik küller kullanılarak geopolimer harçlar üretilmiştir. Alkali-füzyon ile volkanik küldeki kristal yapılar önemli oranlarda kırılmakta ve amorf fazlar oluşmaktadır. Alkali-füzyon ile volkanik küllerin reaktivitesi artmasına karşın bu malzemeler ile üretilen geopolimerlerin basınç dayanımı, iyileşmemektedir.