Rheological characteristics of bitumens prepared with process oil
Abstract:Rheological characteristics of bitumens prepared with process oil Depletion of natural and finite resources has necessitated the worldwide reuse of waste and residue materials from industrial production. Not only does the utilization of crude oil residue with bitumen allow supply of additives at a very low cost, but it also permits the use of waste and residue materials as rejuvenator in nature. The objective of the study is to evaluate conventional and rheological characteristics of original bitumen samples o… Show more
In this study, halloysite and sepiolite nanoclays were used to reinforce SBS modified bitumens. The nanoclays used are different from the materials in the literature and have properties such as easy to find, economical and available from local sources. The mixing parameters were determined before production process. The polymer additive SBS was added into base bitumen at 3% and 5%, the nanoclay additives were added into polymer modified bitumen at 2% and 4% ratios. The morphological structures were investigated under fluorescence microscope. Physical and rheological properties of the samples were compared. The phase separation cases were investigated by storage stability test. Furthermore, rutting performance of samples was measured with zero shear viscosity (ZSV) and multi stress creep recovery (MSCR) test methods.
In this study, halloysite and sepiolite nanoclays were used to reinforce SBS modified bitumens. The nanoclays used are different from the materials in the literature and have properties such as easy to find, economical and available from local sources. The mixing parameters were determined before production process. The polymer additive SBS was added into base bitumen at 3% and 5%, the nanoclay additives were added into polymer modified bitumen at 2% and 4% ratios. The morphological structures were investigated under fluorescence microscope. Physical and rheological properties of the samples were compared. The phase separation cases were investigated by storage stability test. Furthermore, rutting performance of samples was measured with zero shear viscosity (ZSV) and multi stress creep recovery (MSCR) test methods.
The performance of the asphalt pavement highly depends on the properties of the bitumen. Therefore, it is important to classify the bitumen's characteristics in order to ensure the selected binder will provide the desired properties to the asphalt pavement. The Penetration grade, which categorizes the asphalt binder depending on the penetration value of the sample, is one of the most popular system for classification. Since the system considers the penetration value, the bituminous materials having different penetration grade is expected to have different physical, chemical and rheological properties. Within the scope of this study, four bitumen having different penetration grades as 50/70, 70/100, 150/200 and 160/220 were investigated by conventional and rheological analyses. The Penetration Index (PI) and the Rheological Aging Index (RAI) of the samples were calculated to evaluate the effects of penetration grade system on temperature susceptibility and rheological aging characteristics of the samples. As a result, the binders having lower penetration grades are found to be better in terms of rheological aging performance and temperature susceptibility. Furthermore, a very high correlation was found between RAI and PI values of the samples by statistical analysis.
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