Numune Boyutunun Kauçukla Modifiye Edilmiş Kendiliğinden Yerleşen Betonun Basınç Dayanımı Üzerindeki Etkileri

Abstract

Bugüne kadar yapılan çalışmalarda, tane boyutu dağılımındaki atık araç lastiklerinin (WVT) agregaları ve farklı işlenebilirliğe, farklı mekanik ve fiziksel özelliklere sahip partiküller değiştirilerek kauçuk modifiyeli kendinden yerleşen betonlar (RMSCC) imal edilmiştir. Ancak eksenel basınç altında farklı narinlik oranı h/b ile üretilen RMSCC elemanlarının taşıma kapasitesindeki değişim daha önceki çalışmalarda araştırılmamıştı. Bu çalışma kapsamında farklı h/b oranları kullanılarak üretilen RMSCC elemanlarının fiziksel ve mekanik özelliklerindeki değişim hem deneysel hem de teorik olarak incelenmiştir. Beton üretiminde kullanılan doğal kum ve WVT agregası tane boyutları aynı aralıkta olduğundan WVT agregası 4 farklı oranda doğal kum ile değiştirilmiştir. Bu oranlar doğal kum hacminin sırasıyla %5, %10, %15 ve %20'si olarak kullanılmıştır. Narinlik oranları, h/b değerleri1.0, 1.5, 2.0, 2.5, 3.0 ve 3.5 olup, toplam 90 örnek için deneysel ve teorik araştırmalar yapılmıştır. Elde edilen sonuçların doğrusal regresyon modelleri incelenmiş ve bu modellere göre h/b oranları ile denklemler üretilmiştir. Elde edilen denklemlerin sonuçları ve deneysel basınç dayanımı sonuçları karşılaştırılmıştır. Kullanılan WVT agregası miktarı ve h/b oranındaki artışın yanı sıra, numunelerde farklı oranlardan kaynaklanan basınç dayanımı kayıpları olmuştur. WVT agrega oranının basınç dayanımı üzerindeki etkisi, kullanım oranının artmasıyla daha da belirgin hale gelmiştir. Ayrıca h/b oranının basınç dayanımına etkisini belirlemek için regresyon analizleri yapılmıştır. Sonuç olarak elde edilen denklemlere ait R2 değerleri 0,95'in üzerinde bulunmuştur.

Effects of Specimen Size on The Compressive Strength of Rubber Modified Self-Compacting Concrete

Abstract

In the studies carried out until today, rubber-modified self-compacting concretes (RMSCC) had been manufactured by replacing the aggregates of the waste vehicle tires (WVT) in the grain size distribution and particles that have different workability, different mechanical, and physical properties. However, variation of the carrying capacity of the RMSCC elements produced with different slenderness ratio h/b ratio under axial load had not been researched in previous studies. Within the scope of this study, the change in physical and mechanical properties of RMSCC elements produced by using different h/b ratios had been examined both experimentally and theoretically. Since the natural sand and WVT aggregate used in the production of concrete and their grain sizes are in the same range, WVT aggregate has been replaced by natural sand in 4 different proportions. These ratios were used as 5%, 10%, 15% and 20% of the natural sand volume, respectively. Slenderness ratios, h/b ratios were 1.0, 1.5, 2.0, 2.5, 3.0 and 3.5, and experimental and theoretical investigations had been performed for 90 samples in total. The linear regression models of the obtained results had been analyzed and the equations with the h/b ratios according to these models had been produced. The results of the obtained equations and the results of experimental axial pressure had been compared. In addition to the amount of WVT aggregate used and the increase in the ratio of h/b, the compressive strength losses had caused by different rates on the samples. The effect of the WVT aggregate ratio on the compressive strength had become more significant with the increase in use rate. Besides, regression analyzes had been performed to determine the effect of h/b ratio on the compressive strength. In conclusion, regression R2 (coefficient of determination) values that belong to equations obtained had been found over 0.95.

Keywords

• Tire rubber particles
• Waste management
• Self-compacting concrete
• Mechanical properties
• sample size effect

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