The quality and strength of bitumen have been determined by the penetration test, flash and fire point test, and softening point test. Now the bitumen extraction test is conducted to find the quantity of bitumen used in bituminous concrete in percentage.
The test used to determine the bitumen binder usage in the asphaltic pavement by cold dissolver method as per ASTM D 2172 is known as a bitumen extraction test.
A particular piece of bitumen sample shall be collected after completion of pavement work and tested to find out the quality of the bitumen binder.
The quality, durability, and strength of the asphaltic pavement depend upon the percentage of bitumen used. So it is necessary to determine the value to check the quality of the pavement.
The test should be conducted at least three samples, and the average value is the percentage of bitumen used in the pavement.
SI | Description | Sample 1 | Sample 2 | Sample 3 |
1 | Weight of mixture sample (W1) | |||
2 | Weight of filter paper before extraction (F1) | |||
3 | Weight of mixture after extraction (W2) | |||
4 | Weight of filter paper after extraction (F2) | |||
5 | Weight of filler collected in filter paper (F1-F2) =W3 |
The percentage of bitumen = (W1-(W2+W3)/W1) x 100
Video Courtesy – HIGHWAY GUIDE
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Is 4.7% instead of 5% is acceptable for SDBC when tested after calculation. As there any tolerance limits for OGPC seal coat or MSS