Plasticity refers to the deformation of petroleum asphalt under the action of external forces, which does not destroy (crack or break), and the properties of the shape invariable after the external force is retained, also known as ductility. Plasticity is one of the important indexes of asphalt property.
The plastic size of petroleum pitch is related to its composition. There are many resin content in petroleum pitch, and when the content of other components is suitable, it is more plastic.
The factors affecting asphalt plasticity are temperature and asphalt film thickness. The higher the temperature, the higher the plasticity, the thicker the film layer, the higher the plasticity. Conversely, the thinner the film, the less plastic. When the film thickness is thin to 1? When m, the plasticity disappears, that is, it is close to elasticity. At room temperature, the asphalt with good plasticity may be healed by its unique viscoplastic. Therefore, the plasticity also reflects the self-healing ability after asphalt cracking. The reason why asphalt can be used to make flexible waterproof material with good performance depends greatly on the plasticity of asphalt. The plasticity of asphalt has certain absorptive capacity to impact vibration, which can reduce the noise of friction. Therefore, asphalt is also a good ground material.
The plasticity of petroleum pitch is denoted by ductility. The larger the extension, the better the plasticity.