Doğal puzolan-esaslı jeopolimer üretiminde mikrodalga kürünün rolü

Yıl 2024, , 2239 - 2252, 20.05.2024

Kübra Ekiz Barış

https://doi.org/10.17341/gazimmfd.1267017

Öz

Jeopolimer üretiminde uygulanan geleneksel kür yöntemlerinde, yeterli özelik kazanımı için uzun bir kür süresi gerekmektedir. Özeliklerin daha kısa sürede geliştirilmesi amacıyla farklı kür yöntemleri arayışı sürmektedir. Bu araştırmanın amacı, doğal puzolan-esaslı jeopolimer malzeme özeliklerinin mikrodalga kürüyle daha kısa sürede ve daha az enerji harcanarak geliştirilebilmesi olanaklarını değerlendirmektir. Alüminosilikat kaynağı olarak Türkiye’nin Datça Yarımadası’nda bulunan volkanik tüf, dolgu maddesi olarak standart kum ve alkali aktivatör olarak potasyum hidroksit ve sodyum silikat kullanılmıştır. Numuneler dört farklı yöntemle kürlenmiştir: (i) Geleneksel ısı kürü; (ii) Mikrodalga kürü; (iii) Isı+mikrodalga kürü; (iv) Mikrodalga+ısı kürü. Araştırma sonucunda, doğal puzolan-esaslı jeopolimer özeliklerinin mikrodalga kürüyle, geleneksel ısı kürüne nazaran daha kısa sürede ve daha az enerji harcanarak geliştirilebilmesinin mümkün olduğu belirlenmiştir. Isı+mikrodalga veya mikrodalga+ısı kürü (kombine kür yöntemleri), yalnızca ısı veya mikrodalga kürüne nazaran daha yüksek fiziksel ve mekanik özeliklerin elde edilmesini sağlamıştır. En yüksek reaksiyon derecesi, fiziksel ve mekanik özellikler 90 °C’de 24 saat ısı+15 dakika mikrodalga kürüyle elde edilmiştir. Reaksiyonların gelişiminde ilk 12 saatteki etkinliğin daha yüksek olduğu ve 24 saat ısı kürü yerine 12 saat kür süresinin yeterli olduğu belirlenmiştir. Kombine kür yöntemlerinin birlikte uygulanması, diğer yöntemlere nazaran nispeten daha yüksek enerji tüketimine yol açmasına rağmen, malzemenin mekanik özeliklerini yaklaşık iki kat geliştirmesi bakımından önemlidir.

Anahtar Kelimeler

jeopolimer, kombine kür yöntemi, mikrodalga kürü, ısı kürü, malzeme özelliği

Kaynakça

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