En The Obvem 2 12 Points In Designing An Asphalt Concrete Mixture For A Highway Pavement To Support A Heavy Traffic F 1 (35.58 KiB) Viewed 46 times
En The Obvem 2 12 Points In Designing An Asphalt Concrete Mixture For A Highway Pavement To Support A Heavy Traffic F 2 (35 KiB) Viewed 46 times
en the obvem 2:(12 points): In designing an asphalt concrete mixture for a highway pavement to support a heavy traffic following the Marshall mix design method, the data shown in the below table were obtained. The Maximum Nominal Aggregate size used is 1 inch. Asphalt content Gm Density Stability Flow % % (%) (1b/ft?) (lb) (0.01 in) Air Volds VMA 5.5 2.455 153.2 1500 13 4.3 12.8 6.0 2.477 154.6 1590 14 3.5 12,4 6.5 2.496 155.7 1650 16 2.8 12.3 7.0 2.497 155.8 1690 20 2.5 12.6 7.5 2.484 155.0 1610 25 2.4 13.2 Ft Required: a). (3 points): Calculate the possible OBC. (Show full steps) b). (5 points): Depending on the specifications shown in table 18.7, check on the calculated OBC and write down the case obtained regarding the voids and stability values. (show full steps) c). (4 points): Write any necessary suggestions to adjust the original blend of aggregates
Heavy Traffic ESAL >106 (see Chapter 19) 35 50 75 8006 (1800) 8 to 14 3 to 5 (a) Maximum and Minimum Values Light Traffic Medium Traffic Marshall Method ESAL <104 10<ESAL <106 Mix Criteria (see Chapter 19) (see Chapter 19) Compaction (No. of blows each end of Specimen) Stability N (lb) 3336 (750) 5338 (1200) Flow, 0.25 mm 8 to 18 8 to 16 (0.1 in.) Air Voids (%) 3 to 5 3 to 5 (b) Mineral Percent Voids in Mineral Aggregates Standard Sieve - Aggregate size Designation Percent No. 16 23.5 No. 4 21 No. 8 18 Va in 16 Vin. in. 14 1 in. 13 14 in. 12 2 in. 11.5 2% in. 11 Minimum value required 15
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