Tamamlayıcı çimentolu malzemelerle betonun sodyum sülfat direnci üzerine karşılaştırmalı bir çalışma

Sülfat etkisi betonda dayanıklılık sorunlarına neden olan ana faktörlerden biridir. Bu çalışmada, sülfat direncinin fiziksel/kimyasal etkileşimini değerlendirmek için silis dumanı, yüksek fırın cürufu, uçucu kül, kalker filleri, kireç ve Portland çimentosu ile elde edilen beton karışımları bir dizi deney yapılarak araştırılmıştır. Belirtilen tamamlayıcı çimentolu malzemeleri içeren, beş farklı seri beton karışımı, su/ bağlayıcı oranı 0.33 ve toplam bağlayıcı içeriği 400 kg/m3 alınarak üretilmiştir. Beton örnekleri, 365 gün boyunca kirece doymuş suya ve 50 g/l sodyum sülfat çözeltisine maruz bırakılmıştır. Sülfat direncinin değerlendirilmesi, numunelerin basınç dayanımı ve ağırlık değişiminin belirlenmesi ile yapılmıştır. Sülfat etkisine karşı direncin iyileştirilmesi, mineral katkı maddelerinin oranına göre değerlendirilmiş ve sonuçlar, beton karışımlarında seçilen tamamlayıcı çimentolu malzemelerin kullanılmasının, dayanıklılık performansını önemli ölçüde geliştirdiğini göstermiştir.

Anahtar Kelimeler:

Sülfat etkisi, Sülfat direnci, Basınç dayanımı, Beton, Dayanıklılık

A comparative study on the sodium sulfate resistance of concrete with the supplementary cementitious materials

Sulfate attack is one of the main factors causing durability problems in concrete. In this study, in order to evaluate the physical/chemical interaction of sulfate resistance, concrete mixtures with silica fume, blast furnace slag, fly ash, limestone filler, hydrated lime and Portland cement are investigated by conducting a series of experiments. Five different series of concrete mixtures containing the specified supplementary cementitious materials were developed with a water-binder ratio of 0.33 and a total binder content of 400 kg/m3. The concrete samples were exposed to lime-saturated water and sodium sulfate solution of 50 g/l for 365 days. The evaluation of sulfate resistance was done by the determination of compressive strength and change in weight. The improvement of the resistance to sulfate attack is assessed concerning the ratio of the mineral additives and results indicated that using the selected supplementary cementitious materials in the concrete mixtures significantly improves the durability performance.

Keywords:

Sulfate attack, Sulfate resistance, Compressive strength, Concrete, Durability,

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