Study on Low-Temperature Performance of Packed Waste Polymer Modified Asphalt(V)

5 Conclusion

Through the research on the low temperature performance of packaging waste PE modified asphalt, the following conclusions can be drawn:

1. After the PE penetrates into the asphalt, the temperature stability of the asphalt is improved.

2. After the asphalt modification, the elongation of the asphalt is improved, and the more modifier, the smaller the extension.

3. The freeze-thaw test of PE modified asphalt was carried out to measure the low-temperature freezing and breaking performance of the modified asphalt and meet the needs of real life.

The low temperature performance of PE modified asphalt can be explained as follows:

1. Under low temperature conditions, the molecular flow of matrix asphalt decreases, the distance between molecules shortens, the intermolecular force increases, and the brittleness increases. Also at low temperature, due to the presence of fine particles of PE modifier, the particles play a stress concentration. The role of the modifier particles in the external force caused by a large number of fine lines or shear bands, the development of these fine lines or shear bands will terminate in another particle, while fine lines and fine lines will make the lines turn Branching, the coordination of these processes, greatly delayed the material destruction process.

2. When the modified bitumen material is further stretched by external forces, due to the transformation of fine lines into cracks at low temperatures, modifier particles are present at the interface, which crosses both ends of the crack and hinders its further expansion, while absorbing and The energy required to break the mixture is consumed, so the ductility at low temperatures increases and the crack resistance increases.

3. Since the striated body is quite hard at the initial stage of stress, when the stress exceeds a certain value, the stellite body starts to yield, and the deformation develops with the extension of time. After unloading, the strain gradually recovers and the deformation disappears with the prolongation of time, resulting in PE modified asphalt. Has good low temperature performance.

Author: Jiang Shaohua Source: Chinese green ink network