Updating Bituminous Stabilized Materials Guidelines Mix Design Report Phase II
Moisture Sensitivity: Part II (Validation) - Asphalt Academy
Moisture Sensitivity: Part II (Validation) - Asphalt Academy
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Ravelling-Depth [mm<br />
16<br />
14<br />
12<br />
10<br />
8<br />
6<br />
4<br />
2<br />
0<br />
H+1C-E (long)<br />
G2+0C-E07<br />
G2+1C-E01<br />
G2+0C-F04<br />
Ravelling-depth<br />
H+1C-E06<br />
BSM - <strong>Mix</strong>es<br />
H+1L-E02<br />
Q+0C-E08<br />
H+0C-E07<br />
Figure 23: Illustration of the Ravelling-Depth performance of<br />
BMS-<strong>Mix</strong>es after wet MMLS3 trafficking<br />
It is clear from the analysis presented in Figure 24 that early termination of trafficking might<br />
result into less sensitivity of the strength ratio. Moreover, late termination results to high<br />
sensitivity of strength ratio, hence causing irrational ranking of the BSMs. Figure 24 shows<br />
different shifts in strength reduction of BSMs of both premature and extended termination of<br />
MMLS3 trafficking.<br />
Wet Trafficked ITS<br />
Dry Trafficked ITS<br />
400<br />
ITS [kPa]<br />
350<br />
300<br />
250<br />
200<br />
150<br />
100<br />
50<br />
0<br />
H+1C-E01 (long cured)<br />
G2+0C-E02<br />
G2+1C-E01<br />
G2+0C-F01<br />
H+0C-E01<br />
BSM-<strong>Mix</strong>es<br />
Q+0C-E04<br />
H+1C-E02<br />
H+1L-E02<br />
Figure24: The shift indication between wet ITS and dry ITS after MMLS3<br />
trafficking<br />
The selection criteria of BSM-mixes, according to South African Guideline TG2, shows that TSR<br />
values of greater that 75% is ranking GOOD resistance to moisture damage; while greater than<br />
60% is ranking MEDIUM resistant to moisture damage and less than 50% is ranking POOR<br />
resistant to moisture damage.<br />
29