The difference between modified asphalt and medium temperature asphalt in the index is mainly reflected in the following aspects:
1. Softening point: The softening point of modified asphalt is generally higher than that of medium temperature asphalt, which makes the stability of modified asphalt better at high temperature and more suitable for applications that require high temperature resistance.
Coking value: The coking value of modified bitumen is usually higher than that of medium temperature bitumen, which means that at high temperatures, modified bitumen can form higher carbon residue, which is more suitable for industrial applications that require high coking values, such as the manufacture of carbon materials.
Toluene insoluble content: The toluene insoluble content of modified asphalt is usually higher than that of medium temperature asphalt, indicating that its aromatic hydrocarbon content is higher, which is beneficial for improving the mechanical strength and thermal stability of the material.
Quinoline insoluble matter content: The quinoline insoluble matter content of medium temperature asphalt is relatively high, while the quinoline insoluble content of modified asphalt will be reduced after heat treatment, indicating that its chemical composition and structure have changed.
5. Volatile matter: The volatile content of modified asphalt is generally low, which means that at high temperature, modified asphalt has less gas precipitation, which is beneficial to reduce environmental pollution and improve product performance.
Moisture: Modified bitumen typically has a low moisture content, which means it does not need to be dewatered at the time of application and can be used as is.
Sulfur content: The sulfur content of the two may be similar, but its sulfur content may be slightly lower because some small molecules will be removed during the preparation process of modified asphalt.
Ash: Modified asphalt has a low ash content, indicating high purity and is suitable for applications where impurity content is critical.
The differences in these indicators reflect the differences in chemical composition, performance and application between modified asphalt and medium temperature asphalt. Modified asphalt is treated at high temperatures, which improves its high-temperature performance, low-temperature performance and resistance to water damage, making it more suitable for specific high-temperature environments and industrial applications, such as the electrolytic aluminum industry. Medium-temperature asphalt is widely used in building waterproofing, road paving and other fields because of its performance characteristics.