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Introduction of asphalt penetration tester

Release time: July 2, 2019 popularity: ten

Introduction of asphalt penetration tester

1. When the sample is heated for 30 minutes, it should not be higher than the sample softening temperature. After full stirring and sieving, the sample should be injected into the dish.

When placed at room temperature 15 ≤ 39 ℃ for 1 h, the depth should be at least greater than the expected penetration value of 10 mm, and it should be noted that dust should not fall into the cooling system.
2. Soak the sample tray in the water tank containing clear water, keep the water temperature at 25 ± 0.5 ℃ for 1 ≤ 1.5h, and the water surface shall be 25 mm higher than the test surface.

3. Adjust the needling instrument so that the horizontal (if necessary, adjust the weight of the additional weight) press the release button by hand, lift the standard needle bar, and make the top of the needle bar contact with the percentile contact.

4. Take out the sample tray after storing for 1 min, and put it into the flat bottom heat preservation plate whose water temperature is strictly controlled at 25 ℃. The height of the water layer above the surface of the sample shall not be less than 10 mm. The insulation plate should be placed on the circular table of the penetrameter to adjust the table. Make the surface of the sample contact with the tip of the needle (if the adjusting table is not enough, the adjusting nut can be used to adjust the lever bracket to fit with it), and the pointer of percentile can be aligned to zero.

5. Turn the time switch to the time (5S or 60s) gear required for sampling, press the start button, the electromagnet can absorb the standard needle into the sample freely until the red light is on (at this time, the time for the standard needle to penetrate the sample has reached 5 s or 60 s, and the electromagnet automatically demagnetizes the spring to fasten the needle rod, so that the needle rod will not fall off again). Contact the contact point of the standard needle outer rod with the contact point of the outer needle rod of the needle by hand , the number indicated by the pointer at this point is the penetration of the specimen.

6. Repeated tests on the same sample shall be carried out at least three times, and the distance between each penetration point and the dished edge shall not be less than 10 mm. The average value of each test result is the test result of the sample.

7. Before each test, the water temperature in the insulation plate should be checked and adjusted. After the test, the standard needle should be taken out from the cotton cloth or cloth soaked with solvent (gasoline), and then dried with cotton or cloth.

8. The difference between the maximum and minimum values of the three parallel test results shall not exceed the following requirements:

Penetration (0.1 mm) tolerance (0.1 mm)

0/49               2 

50/149             4

150/249            12

250/500            20

When the test value does not meet this requirement, it should be retested.

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fifteen billion eight hundred and thirty-three million seven hundred and eighty-nine thousand and two