Bu çalışmada, %0 (Referans), %1, %2, %3, %4 ve %5 oranlarında öğütülmüş kolemanit minerali çimento ile ikame edilerek beton karışımları hazırlanmıştır. Beton karışımlar 150 x 150 x 150 mm boyutlu küp kalıplara yerleştirilmiştir. Sertleşmiş beton numuneler 28 gün suda kür edilerek, sonrasında 90. güne kadar sodyum klorür (NaCI) çözeltisine maruz bırakılmıştır. Ayrıca aynı özelliklerde üretilen kontrol beton örnekleri ise 90. güne kadar su küründe bekletilmiştir. Kontrol ve NaCI çözeltisine maruz bırakılmış beton numuneler üzerinde Schmidt çekici, ultrases geçiş hızı ve basınç dayanımı deneyleri gerçekleştirilmiştir. Gerçekleştirilen deneyler üzerinden beton numunelerin NaCI çözeltisinin etkisi ile meydana gelen kayıplar hesaplanmıştır Sonuç olarak, çimentoya ikame edilen %5 kolemanit ikameli numunenin, kolemanit içermeyen numuneye göre basınç dayanımını azalttığı, ancak %4' kadar ikame oranlarında ise dayanımı arttırdığı tespit edilmiştir. NaCI çözeltisi kürü sonucunda, en yüksek basınç dayanımı ve en az basınç dayanımı kaybının %3 kolemanit ikameli beton karışımına ait olduğu tespit edilmiştir.
Investigation of nano ulexite mineral effects on mechanical behaviour of warm mix asphalt pavements Research paper Tuba Kütük-Sert, Resul Ekrem Günbey Investigation of nano ulexite mineral effects on mechanical behaviour of warm mix asphalt pavements The research presented in the paper shows that further investigations on additives used in the warm mix asphalt technology are needed. It was observed that the negative effect of adhesion loss in asphalt mixes produced by warm process can be reduced by adding ulexite mineral nano particles to a commercial additive. The Marshall stability, Indirect tensile strength modulus, and moisture susceptibility, were tested for this purpose. Based on the analysis of results, it can be seen that the WMA mixture production temperature can additionally be reduced, and that lower compaction energy is needed during placement of such mixtures, which results in energy savings.
Commercially available raw ulexite (U) minerals were milled up to 120 min by using a highenergy ball grinder for different initial feed sizes (−75 µm and −3 mm), ball to powder ratios (5:1 and 10:1), ball sizes (1 mm and 5 mm), and process control agents (3% and 6%). Particle size distribution and morphology measurements of milled powders were carefully studied. In particle size analysis, the lowest d 90 , d 50 , d 10 and d min values were detected to be 17.547 µm, 1.732 µm, 283 nm and 35 nm, respectively. Therefore, nanoscale in particle size for the ulexite mineral has been achieved. In addition, the smallest milling time was found as 30 min. Moreover, the best powder yield was determined to be 90.5%. In morphology analysis, the milled powders were observed to be more homogeneous than the initial feed size minerals. Besides, findings of morphology analysis were in agreement with that of particle size analysis. It was decided that optimized ball milling parameters are −3 mm for initial feed size; 10:1 for the ball to powder ratio; 5 mm for ball size; 3% for process control agent. The results obtained from this work will be useful for nanoscale research and industrial applications of ulexite (Na 2 O.2CaO.5B 2 O 3 .16H 2 O) material, which is boron mineral.
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