Modified asphalt
The lifetime of asphalt pavements is often much shorter than the expected period, and the cost of maintenance of asphalt,which is one of the main reasons for its poor quality, is very high.
Bitumen and its physical and chemical properties have a major effect on the desired performance, durability and stability of asphalt mixtures.
Must be considered to improve the performance of asphalt mixtures. For this reason, these polymers and minerals are used to modify these mixtures, thereby enhancing the rheological properties of bitumen.
Among these additives, it can be noted that Gilsonite , either alone or in combination with modulation Polymers have been especially effective and have been considered as a solution to improve the asphalt behavior.
Considering that bitumen has a lesser share of the stone material in asphalt mixtures, it may be assumed that the role of bitumen in the behavior, durability and performance of asphalt pavement layers is not so significant and significant, but the fact is that bitumen And its physical and chemical properties have a significant effect on the desired performance, durability and stability of asphalt mixtures.
For proper operation and durability of asphaltic pavement, bitumen should be of durability, good behavior and function at high, low and middle temperatures.
The compatibility between the enhancer and the asphalt is the key to enhancing the effects of asphalt modification.
This adaptation depends on the combination of base asphalt, polarity, particle size, polymer enhancement molecular structure, surface interactions between asphalt and polymer enhancers.
The type of modifier, the temperature of the furnace and the modify steps are also effective in improving the efficiency of the asphalt.
Because Gilsonite powder is a natural bitumen, it is rapidly dispersed in petroleum bitumen and forms a completely stable and uniform oil glue.
Gilsonite’s Resin, alone or in combination with polymer modifiers, has been unique in its effectiveness. And has been considered as a solution to improve and improve the asphalt behavior.
The results of the research indicate that the addition of Gilsonite to pure bitumen has increased the viscosity and bitumen softening point and decreased its degree of penetration.
Adding this powder to pure bitumen also improves the thermal sensitivity but has no effect on the bitumen’s flash point.