ALKALİ İLE AKTİVE EDİLMİŞ ÖĞÜTÜLMÜŞ DİATOMİTLİ HARÇLARIN DAYANIM ÖZELLİKLERİ

Bu çalışmada, sodyum karbonat (Na2CO3) ile aktive edilmiş diatomitli harçların eğilme ve basınç dayanımı değerleri araştırılmıştır. Karışımlarda, Niğde Başmakçı bölgesinden temin edilen 0-5 mm boyutlarındaki kırılmış kalker kumu kullanılmıştır. Karışımlarda, bağlayıcıyı aktive etmek için kullanılan Na2CO3 ve kırılmış kalker miktarları sabit tutulmuştur. Sadece çimento ile üretilen kontrol harcına ek olarak, sabit oranda Na2CO3 ile birlikte çimento yerine ağırlıkça % 0, 25, 50, 75 ve 100 oranlarında öğütülmüş diatomit kullanılarak harç numuneler üretilmiştir. Dahası aynı karışım oranlarındaki çimento yerine % 4 oranında titanyum dioksit (TiO2) kullanılarak da harç numuneler üretilmiştir. Eğilme ve basınç dayanımlarını belirlemek için üretilen numunelere deney gününe kadar kuru veya ıslak kür uygulanmıştır. Öğütülmüş diatomit ve TiO2 içeren harçlara kuru ve ıslak kür uygulandıktan sonra belirlenen eğilme ve basınç dayanımı sonuçları ile kontrol harcı sonuçları karşılaştırılmıştır. Deneysel sonuçlar çimento yerine kullanılan diatomit miktarı arttıkça, Na2CO3 ile aktive edilmiş diatomitli harçların eğilme ve basınç dayanımı değerlerinin azaldığını göstermiştir.

THE STRENGTH PROPERTIES OF ALKALI-ACTIVATED GROUND

In this study, the flexural and compressive strength values of ground diatomite mortars activated with sodium carbonate (Na2CO3) were investigated. The crushed limestone with maximum size of 0-5 mm provided from Niğde-Başmakçı region was used. The amounts of Na2CO3 used to activate the binder and crushed limestone were kept constant used in the mixtures. In addition to the control mortar control produced by only cement, the mortar specimens using the replacement ratios of 0, 25, 50, 75 and 100% ground diatomite by weight of cement together with Na2CO3 at a constant rate were produced. Moreover, the mortar mixtures using the replacement of 4% titanium dioxide (TiO2) by weight of cement were produced in the same mixture proportions. The dry or wet curing was applied on the produced specimens until the testing day to determine the flexural and compressive strength values. The flexural and compressive strength results of mortars made with ground diatomite and TiO2applied the dry and wet curing were compared with the results of control mortars. The experimental results show that the flexural and compressive strength values of ground diatomite mortars activated with NaCO3 decreases as the amount of ground diatomite used instead of cement increases.

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