Aging behavior of bitumen 60/70
In this article, we will discuss the aging behavior of bitumen 60/70 in detail.
The physical and chemical characteristics of bitumen 60/70 that vary over time as a result of exposure to diverse environmental variables are referred to as having an aging behavior. Due to its advantageous qualities, including strong adhesion, flexibility, and resistance to deformation, bitumen 60/70 is a frequently used paving material in the building of roads. However, it is prone to aging, which may impair its durability and function.
The two forms of bitumen aging are short-term aging and long-term aging. Long-term aging takes place during the course of the pavement's service life, whereas short-term aging happens during the manufacturing and building phases.
Bitumen experiences oxidation owing to exposure to oxygen and heat during short-term aging. Its workability and handling properties are impacted by a consequent drop in viscosity and an increase in stiffness. In addition to asphaltenes and other polar molecules, the oxidation process produces other oxidation products that may alter the physical characteristics of bitumen.
When bitumen is exposed to the combined impacts of environmental elements such as sunshine, temperature changes, air, and moisture over a protracted period of time, long-term aging of the bitumen results. Sunlight's ultraviolet (UV) radiation is one of the main causes of bitumen aging. The bitumen's chemical bonds are broken down by UV light, which causes the loss of volatile components and the creation of new chemical compounds. The term "photo-oxidation" refers to this process.
Bitumen rapidly loses some of its physical characteristics as it ages. Aged bitumen loses flexibility and becomes more susceptible to breaking as its viscosity rises. The bitumen becomes more brittle as the stiffness modulus rises as well. The bitumen's chemical makeup may alter as a result of age, with a rise in the proportion of polar molecules. The bitumen's adhesive characteristics and capacity to withstand moisture and wear are impacted by these modifications.
Several laboratory studies are carried out to assess the bitumen 60/70's aging behavior. These assessments take into account factors including elastic recovery, ductility, softening point, penetration, and viscosity. Furthermore, cutting-edge methods like rheological analysis and Fourier transform infrared spectroscopy (FTIR) provides light on the chemical and rheological changes taking place in old bitumen.
Regarding the topics raised, it can be said briefly that, bitumen 60/70 undergoes both short-term and long-term aging processes. Short-term aging during production and construction affects the workability of the bitumen, while long-term aging during the service life of the pavement leads to changes in its physical and chemical properties. The aging process results in increased viscosity, stiffness, and brittleness of the bitumen, reducing its performance and durability. Understanding the aging behavior of bitumen 60/70 is crucial for developing strategies to enhance its resistance to aging and extend the lifespan of asphalt pavements. Further research and development efforts are ongoing to explore additives, modifiers, and techniques that can mitigate the aging effects on bitumen, improving its overall performance and ensuring sustainable road infrastructure.
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