Experimental Assessment of Aggregate Surfacing Materials : Final Project Report 2007
Experimental Assessment of Aggregate Surfacing Materials : Final Project Report 2007
Montana.Dept. of Transportation
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5. Substitute the above parameters into Equation (7) to determine the maximum amount of material passing the No. 10 sieve. Table 14. 1993 AASHTO Minimum Permeability Recommendations Quality of Drainage Minimum Permeability ft/hr cm/s Time to Drain Excellent 41.67 0.353 2 hours Good 3.54 0.030 1 day Fair 0.46 0.004 1 week Poor 0.02 0.0002 1 month Very poor 0.0008 0.00007 Water will not drain Western Transportation Institute 37 Results & Analysis Following is an example calculation. 1. yjmax is d...eteraiined from maximum index density testing to be 138 pcf. 2. The required degree of i?C is assumed to be 0.98, as is commonly used by MDT for the base course. 3. Gj is determined from laboratory testing to be 2.70. 4. A minimum value ofk is assumed to be 0.01 cm/s because it is practical and achievable for these materials based on Figure 29, and will provide fair to good drainage based on the minimum values provided in Table 14. 5. The values are substituted into Equation (7) and F is calculated.
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