The Saipot viscosity test of asphalt is to determine the viscosity of asphalt at a specific temperature through a Sepot heavy oil viscometer to determine its application temperature and applicability. The test is suitable for viscous petroleum asphalt, emulsified asphalt and liquid petroleum asphalt, etc., and is usually carried out in the range of 120°C to 180°C. The test process includes the heating of the sample, the temperature control and the determination of the outflow time, which ensures the accuracy and reliability of the final results and provides an important technical basis for road construction.
Purpose and Scope of Application
The Sepot viscosity test method for asphalt is mainly used to determine the viscosity of different types of asphalt at high temperatures. This method is suitable for viscous petroleum asphalt, emulsified asphalt and liquid petroleum asphalt. With this test, it is possible to determine the application temperature of the asphalt, which is usually determined at 120 to 180°C for viscous petroleum asphalt, compared to 25°C and 50°C for emulsified asphalt and liquid petroleum asphalt, respectively.
Instrument and material requirements
Sepot Heavy Oil Viscometer – This device is used to measure the viscosity of asphalt and needs to be well calibrated and usually recalibrated every three years.
Insulation tank – made of corrosion-resistant metal with adjustable electric heater inside, the temperature can be controlled between room temperature and 240°C. The holding tank needs to have a thermometer support hole and be equipped with suitable water or heat transfer oil as the heating medium.
Specimen Acceptance Bottle – made of heat-resistant glass with a defined volume to ensure accurate measurements.
Sample Tube – The shape and size should be up to standard, and the tube should have a metal cap to prevent the specimen from evaporating during the test.
Thermometers – should have the right range to accommodate different testing needs and maintain accuracy.
Standard viscosity oil – used for the calibration of viscometers to ensure the accuracy of measurement results.
Other equipment – including xylene, lubricating oil, auxiliary tools such as asphalt melting pots, furnaces and ovens.
Detection methods and procedures
Preparation
Clean the instrument – Use a solvent such as xylene to clean the sample container and flow holes to ensure they are dry.
Sample Preparation – Prepare bitumen specimens according to the relevant standards, about 450 grams, and heat slowly until they reach 10 to 15°C above the specified test temperature. The specimen can only be heated once, and it should not be heated repeatedly.
Temperature control - heat the water or oil in the holding tank to the specified test temperature to ensure that the temperature is stable during the test.
Viscometer calibration – The viscometer is calibrated using standard viscosity oil to ensure that it is within the specified outflow time range to ensure the accuracy of the measurement.
Test procedure
Sample filling – cork is plugged tightly at the bottom of the sample tube, and the sieved bitumen sample is injected into the sample tube until the liquid level reaches the mark.
Temperature stirring – Stir the specimen with a thermometer to bring it to the specified test temperature and hold for 1 minute.
Measure the time – immediately remove the thermometer, unplug the cork, and activate the stopwatch at the same time to record the time it takes for the specimen to flow into the receiving bottle until the sample reaches the 60 ml line of the receiving bottle.
Report on the results
The test results should be tested in at least two parallel tests and ensure that the results meet the allowable error requirements of the repeatability test. If the results meet the requirements, the average value is taken as the test results. In the result report, the type of sample, the test conditions and details of the equipment used should be indicated.
summary
The Sepot viscosity test is a reliable asphalt testing method that can effectively evaluate the fluidity and adaptability of different types of asphalt, providing critical data for engineering construction. Through standardized experimental procedures and strict temperature control, the method ensures that the quality of the asphalt meets engineering standards. With the continuous development of road construction, the test plays an increasingly important role in the performance evaluation and quality control of asphalt materials, and promotes the application and development of asphalt materials.
