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NOTE
Prior to measuring asphalt content, the gauge must
contain a calibration corresponding to the asphalt
samples to be tested (see Chapter 4:). The percent
(%) asphalt of the test samples must be within the
range of the gauge calibration (see the example on
page 4-3).
To prepare measurement samples:
1. Obtain the weight of an empty sample pan using an accurate
balance scale or electronic scale. Record the pan weight.
2. Partially fill (1/3 full) the pan with the asphalt mix. Lightly
tamp the mix with a spoon or spatula. Do not pack the
material with a press or hammer.
3. Continue adding hot asphalt in layers, settling and tamping
each layer until the pan is full and the asphalt is above the
pan top. The asphalt sample should be level with the top of
the pan, so place a piece of wax paper over the asphalt and
press down on the sample with a wooden board or other flat
object.
4. Remove the wax paper and place the full sample pan on the
scale and obtain the weight. Record the value.
5. Repeat the above procedure for each sample. Make sure
each sample has the same weight (±4 g).
6. Take a measurement as described the following section.
7. Upon measurement completion, remove the asphalt from
the sample pan by reheating the pan in an oven. Turn the
pan upside down and lightly tap on the bottom. Do not dent
the bottom of the pan!
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