The aging effects on the bitumen 60/70 performance
The performance of bitumen 60/70 in road building is greatly impacted by age. It results in a rise in viscosity and stiffness, a decrease in adhesion, embrittlement, and a change in temperature susceptibility. The overall effectiveness and durability of the asphalt pavement are jeopardized by these impacts, which combined cause a variety of pavement distresses. The right choice of bitumen modifiers, additives, and mix design techniques is crucial to reducing these impacts. Aging bitumen pavements may also benefit from routine maintenance and rehabilitation methods including overlays and surface treatments.
Known for its intermediate penetration and viscosity capabilities, bitumen 60/70 is a frequently used binder ingredient in the building and maintenance of roads. Its performance and appropriateness for road applications are affected by different physical and chemical changes that take place as this bitumen matures over time.
An increase in stiffness and viscosity of bitumen 60/70 is one of the main impacts of aging. Bitumen oxidizes as a result of exposure to oxygen, sunshine, and temperature changes. As a consequence, cross-linked structures are created and the material gradually thickens. The bitumen may become more difficult to handle and apply during construction as a result of the increased stiffness. Additionally, the greater viscosity may make it more difficult for the mixture to adequately coat the particles, which might diminish adhesion and damage the overall quality of the asphalt mix.
The development of microcracks and embrittlement is another side effect of aging. The bitumen may eventually grow more brittle due to frequent loads from vehicles and climatic conditions including freeze-thaw cycles. This may cause tiny fractures to grow in the asphalt surface, which might act as channels for water penetration. As water seeps into these fractures, it may cause the pavement's structure to deteriorate even more, creating potholes and making it more vulnerable to rutting and fatigue cracking.
Additionally, bitumen's volatiles, the lighter elements that give it its sticky characteristics, might disappear due to age. The adhesive strength between bitumen and aggregates weakens when these volatiles evaporate as a result of extended exposure to heat and sunshine. Reduced adhesion may result in stripping and moisture-related deterioration, which can undermine the asphalt pavement's overall durability and long-term performance.
The temperature susceptibility of bitumen is also impacted by aging. The temperature-viscosity connection changes with aging, making bitumen more prone to temperature-related problems. Aged bitumen may become softer at high temperatures in hot climes, which might result in rutting. In contrast, the embrittlement of old bitumen may cause cracking and less flexibility in cold areas.
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