The asphalt film heating test is used to evaluate the quality change and aging resistance of road petroleum asphalt and polymer modified asphalt at high temperatures. By measuring the physical properties of asphalt residues, such as penetration, ductility and softening point, it is possible to effectively reflect the changes of asphalt in a hot environment. This method provides an important basis for the practical application and quality control of asphalt.
Purpose and Scope of Application
This method is suitable for determining the quality change of road petroleum asphalt and polymer modified asphalt after film heating, and helps to evaluate the aging resistance of asphalt. By determining the properties of the residue after heating, it provides a reference for the use and modification of asphalt.
Technical requirements for instruments and materials
Thin-film heating oven – should have an operating temperature range of 200°C, a temperature control accuracy of 1°C, and be equipped with a temperature regulator and a rotatable disc rack.
Sample container - it needs to be clean, dried and cooled, which can withstand high temperatures and has good chemical stability.
Methods and Steps:
Preparation
The sample vessels are numbered, their quality is weighed, and recorded.
Asphalt specimens are prepared according to regulations, injected into sample containers, formed into a uniform film, and weighed after cooling to room temperature.
Make sure that the thermometer is installed correctly and that it is at the temperature required for the experiment.
Test procedure
Adjust the oven to a constant temperature and set the turntable to rotate at the appropriate speed.
Place the specimen container in the oven and keep it heated at 163 °C ± 1 °C for 5 hours.
At the end of the process, the sample dish is removed, the mass change is measured, and the quality is recorded if necessary.
The residue is subjected to subsequent physical property tests, such as penetration and softening point.
Calculations & Reporting
The quality change is recorded and the result is calculated based on the allowable error. The report should include changes in quality, penetration, and other physical properties.
Allowable error
When the mass change is less than or equal to 0.4%, the allowable error is 0.04%; If it is greater than 0.4%, it is 8% of the average. The determination of properties such as penetration and softening point also needs to meet the corresponding standards.
summary
Asphalt film heating test is an important method to detect the aging resistance of asphalt, which is suitable for road petroleum asphalt and polymer modified asphalt. By heating the asphalt film at 163°C for 5 hours, the quality change and physical properties of the asphalt film can be evaluated, which can effectively reflect the performance of asphalt in a high-temperature environment. The test involves precise equipment requirements and rigorous steps to provide a scientific basis for the use of bitumen by determining indicators such as penetration, ductility and softening point of the residue. The allowable error of the experimental results also ensures the reliability of the detection and promotes the application and development of asphalt materials in practical engineering.
