This detection method is aimed at the determination of ash content of asphalt materials, and is suitable for petroleum asphalt, rock asphalt and lake asphalt. The asphalt sample is calcined at 900°C ±10°C in a high-temperature furnace, and the residue is collected in an evaporation dish to calculate the ash content. The method has high accuracy and repeatability, which provides important data support for the performance evaluation of asphalt.
introduction
Asphalt is a commonly used material in modern construction and road engineering, and its performance and quality directly affect the durability and safety of the project. As one of the important indicators of asphalt, the ash content reflects its mineral composition and quality. Therefore, accurate determination of ash content of asphalt is of great significance for material selection and engineering application.
Purpose and Scope of Application
This detection method aims to accurately determine the ash content in various asphalt materials, and is suitable for various types of asphalt materials such as petroleum asphalt, rock asphalt and lake asphalt. Through this test, it can provide a scientific basis for the application of asphalt in different engineering fields.
Instrument and material technical requirements
instrument
High-temperature furnace - should have a temperature control function of 900°C±10°C, and be equipped with a temperature regulation controller to maintain a stable high temperature state.
Evaporation dish - 50mL capacity, high temperature resistance is required, and can withstand high temperature environment of 900°C.
Balances – their inductance should not be greater than 0.1mg to ensure the accuracy of the weighing results.
Other equipment – including dryers, crucible pliers, ovens, etc., is used to assist in the experimental process.
material
Bitumen samples – should meet the appropriate standards to ensure the representativeness and consistency of the sample.
Methods and Steps:
Preparation
Pre-treatment of evaporation dishes
The evaporation dish is thoroughly cleaned and dried in the oven to ensure that no moisture and impurities remain.
The dried evaporation dish is placed in a high-temperature furnace and calcined at 900°C±10°C to constant weight. At this time, the mass difference between the two consecutive weighings should not exceed 0.3mg to ensure that the evaporation dish reaches a stable state.
Test procedure
Sample preparation
According to the requirements of Protocol, prepare a 3g (±0.1 mg) bitumen sample and place it in a treated evaporation dish.
Temperature control and calcination
Place the evaporation dish containing the bitumen sample in a high-temperature furnace and slowly increase the temperature to prevent the sample from spilling out due to the rapid increase in temperature.
After the volatiles in the sample have completely volatilized, the furnace temperature is continued to be raised to 900 °C ± 10 °C for 2 hours. If black particles are still visible after calcination, continue heating until the residue is completely black-free.
Cooling & Weighing
The calcined evaporation dish is taken out, placed in air to cool for 5 minutes, and then placed in a dryer to cool to room temperature.
After cooling, use a balance to weigh the mass of the evaporation dish and residue to an accuracy of 0.1 mg.
Repeat the test
If the difference between two consecutive weighing is more than 0.3mg, it is necessary to repeat the calcination for 15~30 minutes each time until the requirement of continuous weighing difference is met.
Data logging and results reporting
The same asphalt sample should be tested in at least two parallel tests. If the difference between the results of the two parallel tests does not exceed 0.03%, the average of the two is taken as the final result. When recording the results of the trial.
Pay special attention
Allowable error - 0.03% for repeatability test and 0.05% for reproducibility test.
The data record should include the initial and final mass of each experiment, as well as its calculated results, for subsequent review and tracking.
conclusion
The detection of asphalt ash content is an important part of evaluating the performance of asphalt materials. Through the high-temperature furnace method, the ash content in asphalt samples can be determined efficiently and accurately, which provides a scientific basis for the application and development of asphalt. This method not only ensures the accuracy of the inspection, but also provides strong support for the performance analysis and engineering decisions of the material.
summary
The determination of asphalt ash content is an important part of evaluating its physicochemical properties. With a standardized high-temperature furnace method, the experimenter is able to effectively control the temperature and calcination time, resulting in reliable results. With the development of technology, more advanced detection methods may be introduced in the future to further improve the detection accuracy and efficiency.
