Preparation method of asphalt oxygen index test sample
Asphalt oxygen index test sample preparation tool required:
1. Scissors/Blades
2. Oven
3. Dryer
4. Glass or ceramic base plate
The material required for the preparation of the test sample for the asphalt oxygen index method:
1. Glass fiber surface mat with a specification of 50g/m2
2. Glycerol and talcum powder: prepared as a separating agent in a mass ratio of 2:1
3. Kraft paper thickness 0.1mm-0.2mm
Asphalt oxygen index test procedure:
1. Trim three square glass fiber mats with side lengths of 150 mm ± 1 mm, dry them in an oven at 120°C ± 2°C for 60 to 90 minutes, remove them and put them into a desiccator and cool them to room temperature. At the same time take more than 15 sheets of kraft paper with a length and width of 50mm/60mm respectively as backup sheets.
2. After weighing a dried fiberglass mat (accurate to 0.1g), preheat it in an oven at a temperature of 120°C±2°C for 30 to 45 minutes with the mold frame and baseplate apparatus.
3. According to GB11147 take asphalt sample (), the asphalt is heated to have a good fluidity (to fully immerse the temperature of the surface of the glass fiber mat), and after mixing evenly weighed 25 times the weight of the glass fiber surface felt bitumen (accurate to 0.1 g). Note that the maximum temperature of the asphalt family should not exceed 200 degrees Celsius.
4. Remove the glass fiber mat, mold frame and bottom plate from the oven, quickly apply the release agent evenly on the bottom plate, place the mold frame horizontally on the bottom plate, and overlay the three glass fiber surface mats together and put them into the mold. In the box, the bitumen was then evenly cast on the surface mat of the glass fiber so that it saturated the surface mat of the glass fiber. After cooling to room temperature, wipe off the surface of the test piece with a dry cloth or soft paper. Cut off the surrounding edges by 15mm±1mm, and cut it to a length of 110-120mm and a width of 6.5mm±0.5mm. Samples. Each group of at least 15 samples.
5. As shown in the figure below, separate the cut asphalt sample from one end with a separator to prepare the asphalt oxygen index test.
The above method is the preparation method of asphalt oxygen index method sample. The relevant test standard is the oxygen index method for the determination of bitumen combustion performance of China's petrochemical industry standard NB/SH/T0815-2010. Users in need can download it free of charge in the relevant standard download area of ​​Yu Lei website.
The same place with other conventional materials oxygen index test is that before the test, one sample needs to be ignited to observe the burning condition during the observation period, and an oxygen concentration is initially estimated to be tested. The difference is that if the sample of asphalt oxygen index burns rapidly, the oxygen concentration at the start of the test is about 18%; if the sample burns slowly or unstable combustion, the oxygen concentration at the beginning of the test is about 21%; if the sample If combustion does not continue, oxygen concentration should be at least 25% at the start of the test.
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