What are the meanings of viscosity, plasticity, temperature sensitivity and atmospheric stability of petroleum asphalt? How to evaluate

The viscosity of petroleum asphalt, also known as viscosity or viscosity, is a characteristic that reflects the internal resistance of asphalt materials to its relative flow. It reflects the hardness and thinness of asphalt materials.

For viscous (semi-solid or solid) petroleum asphalt, it is expressed by penetration, and for liquid petroleum asphalt, it is expressed by viscosity.

plastically

Plasticity refers to the property that petroleum asphalt is deformed without being destroyed under the action of external force, and can still maintain its deformed shape after removing external force. The reason why asphalt can be made into flexible waterproof material with good performance is largely determined by the plasticity of asphalt. The plasticity of asphalt can absorb the impact vibration load to a certain extent, and can reduce the noise during friction, so asphalt is an excellent road paving material.

The plasticity of petroleum asphalt is expressed by ductility.

Temperature sensitivity

Temperature sensitivity refers to the performance that the viscosity and plasticity of petroleum asphalt change with the rise and fall of temperature.

Temperature sensitivity is expressed by softening point index. Because there is a certain transformation interval between the solid state and the liquid state of asphalt material, it is stipulated that a certain state should be taken as the starting point of the transition from solid state to viscous state, and the corresponding temperature is called the softening point of asphalt.

atmospheric stability

Atmospheric stability refers to the anti-aging performance of petroleum asphalt under the long-term comprehensive action of atmospheric factors such as heat, sunlight, oxygen and humidity, and it is also the durability of asphalt materials. Atmospheric stability is the aging resistance of asphalt.

The atmospheric stability of petroleum asphalt is evaluated by the percentage of evaporation loss during heating and the penetration ratio before and after heating.