STYRENE-BUTADIENE-STYRENE MODIFIED LOW PENETRATION BITUMEN
Journal Title: Вестник Харьковского национального автомобильно-дорожного университета - Year 2018, Vol 83, Issue
Abstract
The tendency to construct road pavements with high stiffness module requires using low penetration bitumen in their composition. The fragility of such bitumen is a well-known issue for the countries with severe climate conditions – such as low temperature at winter. The bitumen modification by high amount of SBS-type polymer is able to significantly decrease their brittle point. This process is based on micromorphology changing, and starts when the amount of polymer is enough for creating a continuous polymeric phase in binder (phase inversion). Trough using high modified bitumen as a decision it is preferable to know the required amount of polymer, that can vary for different types of bitumen. The goal of this work was to estimate the influence of bitumen structural type on amount of polymer that required for low temperature characteristic changing. The first criterion was to obtain the polymer modified bitumen with brittle temperature lower than required for traditional grades bitumen. The second criterion was to provide the penetration of this binder in a range of 10-30 × 0.1 mm (as high modules asphalt required). For research three bitumen with close penetration were taken from different sources. This bitumen can be classified as different structural type bitumen – sol, sol-gel & gel (or close to gel – depending on classification criteria). As a result of research it was found that for bitumen with penetration close to 50 × 0.1 mm the exceeding of 5 % polymer concentration results in their phase inversion, causing brittle point drastical decrease. This process is more intense for gel type bitumen, so they can be more suitable as a primary product for the modification, unlike the bitumen of sol type. Using additional test – determination of the equipenetration temperature – makes clear one more issue of the sol type bitumen. The softening point of equipenetration temperature is not exceeding 54 °C for polymer modified sol type bitumen, that can results in high pavement rutting. Despite the profits of the gel type bitumen usage for polymer modification it was found that this type of modified bitumen is not stable at the technological temperatures, and must be used after modification immediately. The conclusion of this research can be useful for the low penetration polymer modified bitumen for high modules asphalt pavements designing and technological usage.
Authors and Affiliations
A. Galkin, Y. Pyrig
Keywords
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- EP ID EP466318
- DOI 10.30977/BUL.2219-5548.2018.83.0.5
- Views 88
- Downloads 0
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