A new approach to bituminous composites

Okuş, Dilek
The healing effects of fillers on bitumen have been known for many years. In this study, the effects of fillers, e.g. manganese dioxide, barium sulfate, perlite and vermiculite, and filler concentrations on morphological, mechanical, flow and sound insulation characteristics of bitumen were examined. It was also aimed to improve the mechanical and sound insulation properties of bituminous composites. Bituminous composites were prepared by using Brabender Plasti-Corder. Mixing was made at 130°C with 60 rpm for 20 minutes. 20/30 and 50/70 penetration grades bitumen, SBS polymer and CaO used in the composites were kept constant. While the amount of CaCO3 was decreased, other fillers (i.e., MnO2, BaSO4, perlite and vermiculite) were added in the same proportion to investigate their effects. According to the test results, all fillers were covered by bitumen as observed in SEM figures. MnO2 composites did not give good results in the tests and they were very brittle. While perlite seemed to have good mechanical properties, it was too viscous to be processed easily. Increase in the amount of vermiculite in the composite caused adverse effects on the rheological properties of composites. However, vermiculite composites provided a remarkable sound insulation in terms of the sound damping ratios. BaSO4 composites gave the best results in the mechanical, flow and sound insulation tests.


Mechanical design and analysis of a novel fixation device for human bone fractures
Yenigün, Çağrı; Tönük, Ergin; Oğuz, Erbil; Department of Biomedical Engineering (2016)
Fixation of bone fractures over a desired time period is one of the most important requirement for their healing processes. Fracture fixation devices are designed to satisfy particular requirements for different types of bone fractures. Conventional and locking plates, intramedullary rods and screws of trauma surgery, and polyaxial screws, connectors and rods of spinal surgery are the examples of contemporary implants for varying bones and their fractures. The mentioned fixation system is inspired from spin...
Determination of thallium by volatile compound generation atomic absorption spectrometry
Ataman, Seval; Ataman, Osman Yavuz; Department of Chemistry (2011)
Determination of thallium is important due to its toxic effects on the environment and human health. Extremely low abundance of thallium in earth crust requires very sensitive and accurate methods for determination of this element. Although volatile compound generation is a sensitive, fast and economical method, thallium determination by this method has not been sufficiently investigated in literature, because of the fact that the formation of volatile forms of this element is a difficult task. A continuous...
Determination of phenolic compound profiles and antioxidant effect of black elderberry, echinacea and iceland moss extracts on late-release soft lozenge
Yıldız, Özge; Bayındırlı, Alev; Çapanoğlu Güven, Esra; Department of Food Engineering (2021-6)
Medicinal plants contain different bioactive compounds that have immune system stimulant, anti-inflammatory, antibacterial, antiviral, antifungal, anticancer and wound healing effects. Echinacea purpurea L., Sambucus nigra L. and Cetraria islandica L. are known with their high antioxidant content and health promoting properties. The main objective of the study was to determine the total phenolic content, total flavonoid content and antioxidant capacity of each plant extract with water and 75 % ethanol as so...
Cyclic behavior of saturated low plastic fine soils
Sağlam, Selman; Bakır, Bahadır Sadık; Yılmaz, Mustafa Tolga; Department of Civil Engineering (2011)
Weakening and liquefaction of sands with increasing excess pore water pressures under repeated loads is well-known. Occurrence of extensive damage to the built environment also at the sites underlain by fine soils during earthquakes have led the researchers to focus on the seismic response of such soils more recently. The primary objective of this study is to investigate the factors affecting cyclic behavior of saturated low-plastic fine soils through laboratory testing. An extensive laboratory testing prog...
Panomycocin-incorporated chitosan-tpp nanoparticles : preparation, characterization and in vitro determination of antifungal activity against human dermatophytes
Elçin, Evrim; İzgü, Kadri Fatih; Department of Biotechnology (2013)
There is an increase in the incidence of superficial fungal infections. Especially, immuno-compromised patients, diabetic patients, obese and people having resistancy against a group of antifungal drugs are at great risk. In these patient groups the infection can become chronic and affect the deeper and living layers of the skin and can be life threatening if not treated effectively. However, drugs which are currently used in the therapy of dermatophyte infections are becoming less effective due to the seri...
Citation Formats
D. Okuş, “A new approach to bituminous composites,” M.S. - Master of Science, Middle East Technical University, 2010.