Yüksek Dayanımlı Betonların Yarmada Çekme Dayanımlarının TYM Tabanlı Tahmini

Bu çalışmada yüksek dayanımlı betonların erken yaş yarmada çekme dayanım sonuçlarının kapsamlı değerlendirilmesi sunulmaktadır. Bunun için çimento ile hacimce %5, %10 ve 15 oranlarında silis dumanı ve ince agrega ile hacimce %8, %10 ve %12 oranlarında mermer tozu yer değiştirilerek 72 seri beton karışımı hazırlanmıştır. Hazırlanan bu karışımlarda Su/Çimento (S/C) oranları 0.20-0.25-0.30 ve çimento dozajı ise 400-450-500 kg/m3 olarak seçilmiştir. Elde edilen numunelere 3. ve 7. günlerde yarmada çekme dayanımı testi uygulanmıştır. Bu testler sonucunda alınan veriler tepki yüzeyi metodu (TYM) kullanılarak analiz edilmiştir. Analiz sonucunda yarmada çekme dayanımını tahmin eden matematiksel modeller geliştirilmiştir. Geliştirilen matematiksel modellerin doğruluğunun tespiti için 9 adet kontrol serisi hazırlanmış ve modelin tahmin sonuçları ile karşılaştırılmıştır. Bunun sonucunda bağıl hata oranları (BHO) hesaplanarak geliştirilen matematiksel model doğrulanmıştır.

Anahtar Kelimeler:

Yüksek dayanımlı beton, Yarmada çekme dayanımı, Silis dumanı, Mermer tozu, Tepki yüzeyi metodu

Estimation of Splitting Tensile Strength of High Strength Concretes by RSM-Based

In this study, a comprehensive evaluation of the early age splitting tensile strength results of high strength concretes is presented. For this, 72 series concrete mix was prepared by replacing 5%, 10% and 15% silica fume by volume with cement and marble powder at 8%, 10% and 12% volume by volume. In these prepared mixtures, water/cement (W/C) ratios were chosen as 0.20-0.25-0.30 and cement dosage as 400-450-500 kg/m3. Splitting tensile strength test was applied to the samples obtained on the 3rd and 7th days. The data obtained as a result of these tests were analyzed using the response surface method (RSM). As a result of the analysis, mathematical models were developed that predict the splitting tensile strength. In order to determine the accuracy of the developed mathematical models, 9 control series were prepared and compared with the prediction results of the model. As a result, the mathematical model developed by calculating the relative error rates (ARD) was verified.

Keywords:

High strength concrete, Splitting tensile strength, Silica fume, Marble powder, Response surface method (RSM),

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