Find the height for critical equilibrium H cr of the soil-rock interface.

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Problem: In designing an asphalt concrete mixture for highway pavement, data in the table below showing the aggregate characteristics were used. Percent by weight of Effective specific Aggregate type Bulk specific gravities total paving mixture gravity Coarse aggregates 42 Fine aggregates 51 Mineral fillers 7 2.60 2.71 2.82 2.69 Determine the optimum asphalt content as a percentage of the total mix if results obtained using the Marshall method are shown in the following table. The specific gravity of the asphalt is 1.02. (Use Table 8 for required specifications.) Weight of Specimen (g) Percent Asphalt in Air in Water Stability (lb) Flow (0.01 in.) 5.5 1325.3 785.6 1796 13 6.0 1330.1 793.3 1836 14 6.5 1336.2 800.8 1861 16 7.0 1342.0 804.5 1818 20 7.5 1347.5 805.1 1701 25

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Chapter 15, Problem 15.2P

To determine

Find the height for critical equilibrium Hcr of the soil-rock interface.

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Problem: In designing an asphalt concrete mixture for highway pavement, data in the table below showing the aggregate characteristics were used. Percent by weight of Effective specific Aggregate type Bulk specific gravities total paving mixture gravity Coarse aggregates 42 Fine aggregates 51 Mineral fillers 7 2.60 2.71 2.82 2.69 Determine the optimum asphalt content as a percentage of the total mix if results obtained using the Marshall method are shown in the following table. The specific gravity of the asphalt is 1.02. (Use Table 8 for required specifications.) Weight of Specimen (g) Percent Asphalt in Air in Water Stability (lb) Flow (0.01 in.) 5.5 1325.3 785.6 1796 13 6.0 1330.1 793.3 1836 14 6.5 1336.2 800.8 1861 16 7.0 1342.0 804.5 1818 20 7.5 1347.5 805.1 1701 25

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