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Instructions for Use of the Penetration Tester for Grouted Asphalt Mixtures
2021-05-24
Instructions for Use of the Penetration Tester for Grouted Asphalt Mixtures
1. Demold the specimens that have been cooled and allowed to stand according to the specified procedures, ensuring that the side surface of the specimen serves as the test surface, and then reinsert the specimens into the test molds.
2. Place the test mold and the test specimen together into a water bath pre-set to a specified temperature and keep them there for 60 minutes.
3. Insert the penetration rod vertically into the center of the specimen’s surface, ensuring that it also contacts the surfaces of other specimens.
4. Release the penetration rod and simultaneously start the stopwatch to begin timing. Apply an initial load of 2.5 kgf (24.5 N), and record the dial gauge reading (penetration depth) at 10 minutes.
5. Secure the penetration rod, and adjust the dial gauge reading at 10 minutes under this load to zero. In the absence of any impact force, place a 50 kgf (480.5 N) weight on the loading platform, and record the dial gauge readings (penetration values) at 1 minute, 2 minutes, 3 minutes, 5 minutes, 10 minutes, 20 minutes, 30 minutes, and 60 minutes.
6. The penetration at 30 minutes is the penetration depth of the specimen. The difference between the penetration at 60 minutes and the penetration at 30 minutes is the incremental penetration. The deviation between the two measurements must not exceed 0.1 mm.
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