FARKLI KÜR YÖNTEMLERİYLE ÜRETİLEN GEOPOLİMER HARÇLARIN BAZI DURABİLİTE ÖZELLİKLERİNİN ÇİMENTO HARÇLARIYLA KIYASLANMASI

Öz

Bu çalışmada, mikrodalga kürü ile üretilen uçucu kül, pomza, perlit ve pişirilmiş kil esaslı geopolimer harçların bazı durabilite özellikleri incelenmiş ve elde edilen sonuçlar geleneksel etüv kürü ile üretilen serilerle kıyaslanmıştır. Bu kapsamda alkali-silis reaksiyonu direnci, kılcal su emme hızı, aşınma direnci deneyleri yapılmış, ayrıca hamur mikro yapıları taramalı elektron mikroskobu ile incelenerek durabilite-içyapı ilişkisi irdelenmiştir. Geopolimer harçların durabilite özelliklerinin karşılaştırılması amacıyla, incelenen harca benzer basınç dayanımına sahip portland çimentolu harçlar üretilmiş ve iki sistemin durabilite konusundaki avantaj ve dezavantajları araştırılmıştır. Geopolimer harçlarda alkali-silis reaksiyonundan kaynaklanan bir genleşme yaşanmadığı ve geopolimer harçların aşınma dirençlerinin, çimento harçları ile kıyaslanabilecek seviyelerde olduğu tespit edilmiştir. Kılcallık deneyi ve taramalı elektron mikroskobu incelemelerinde elde edilen bulgular, alüminosilikat tipi ve kür yönteminin kılcal su emme hızı üzerinde etkili olduğunu; pomza, perlit ve pişirilmiş kil esaslı geopolimer harçların kılcal yolla hızlı bir şekilde su emebildiklerini, bunun da boşluklu mikro yapıdan kaynaklandığını göstermiştir.

Anahtar Kelimeler

• Geopolimer Harç
• Mikrodalga Kürü
• Alkali-silis Reaksiyonu
• Aşınma Direnci
• Kılcallık

COMPARISON OF SOME DURABILITY PROPERTIES OF GEOPOLYMER MORTARS PRODUCED WITH DIFFERENT CURING METHODS WITH CEMENT MORTARS

Öz

In this study, some durability properties of microwave-cured fly ash-, pumice-, perlite-, and burnt clay-based geopolymer mortars were investigated comparatively with those of the conventional oven-cured geopolymer mortars. In this context, alkali-silica reaction, sorptivity and abrasion resistance tests were carried out, and the microstructures of the pastes were examined using scanning electron microscope to investigate the relationship between durability and microstructure. In order to compare the durability properties of geopolymer mortars, portland cement mortars with similar compressive strength were produced. Results indicated that geopolymer mortars exhibit no expansion due to alkali-silica reaction, while their abrasion resistance was comparable to that of the cement mortars. The sorptivity test and scanning electron microscope examinations revealed that the type of aluminosilicate and curing method influence the capillary water absorption rate. Pumice-, perlite-, and burnt clay-based geopolymer mortars demonstrated rapid water sorptivity. The fact was attributed to the presence of considerable amount of pores in the microstructure, as provided by electron microscope images.

Anahtar Kelimeler

• Geopolymer Mortar
• Microwave Curing
• Alkali-silica Reaction
• Abrasion Resistance
• Sorptivity

Kaynakça

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