InstroTek CORELOK - Page 8

InstroTek
5
temperatures below 120º F will not affect the sample density. It is
recommended that samples be cooled to this temperature prior to sealing.
Table 1, shows data on nine different asphalt samples tested at room
temperature, 120F, 150F and 200F. The density errors as seen from this test
range from 0 to 0.019 g/cm
3
. The maximum error occurred at 150F on a
coarse graded mix. To ensure accurate density measurements by the
CoreLok test, we recommend temperatures of less than 120F.
Table 1: Density (g/cm
3
) of Samples Tested in the CoreLok at Different
Temperatures
Sample
Density @
Room
Temp
g/cm
3
Density @
120F
Density @
150F
Density @
200F
Difference
g/cm
3
1. Fine
2.310
2.303
0.007
2. Fine
2.273
2.265
0.008
3. Coarse
2.214
2.233
0.019
4. Coarse
2.097
2.105
0.008
5. Fine
2.302
2.304
0.002
6. Fine
2.282
2.282
0.000
7. Fine
2.308
2.300
0.008
8. Coarse
2.210
2.219
0.009
CoreLok Applications
In addition to measuring bulk specific gravity of compacted specimens, the
CoreLok can also be used for the following applications:
1. Maximum specific gravity (Gmm) or “Rice” specific gravity of loose
asphalt mixtures. Special channel bags are required for this test.
2. Apparent specific gravity of fine and coarse aggregates.
3. Bulk specific gravity and absorption of fine and coarse aggregates.
4. Porosity or permeability of field and laboratory samples.
5. Indirect determination of percent asphalt content