2. An asphaltic concrete surface course mixture is being designed for heavy traffic by the Marshall method. The aggregat

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2 An Asphaltic Concrete Surface Course Mixture Is Being Designed For Heavy Traffic By The Marshall Method The Aggregat 1 (64.63 KiB) Viewed 27 times

2. An asphaltic concrete surface course mixture is being designed for heavy traffic by the Marshall method. The aggregate combination in a trial mixture contains 38% coarse aggregates, 52% fine aggregates, and 10% mineral filler; specific gravities of these materials are 2.631, 2.690, and 2.714, respectively. The nominal maximum particle size is 1.5 inches. Asphalt cement to be used has a specific gravity of 1.02. Results of tests on specimens prepared from this aggregate combination and various percentages of asphalt (by weight of total mixture) are as follows: %AC Gm. 5.0 5.5 6.0 6.5 7.0 My (gm) In Air 1321.8 1325.8 1333.1 1345.3 1347.8 In Water 775.9 787.1 796.1 803.2 798.1 2.571 2.551 2.531 2.511 2.492 Stability Flow (lb) (0.01 in) 1794 11 1840 12 1857 14 1821 18 1699 23 (a) Determine the optimum asphalt content for this mixture as the average content for maximum stability, maximum bulk specific gravity, and 4% air voids. (Carry 3 decimals in all calculations.) (b) Check if the mixture with this asphalt content is satisfactory. If it is not satisfactory, recommend an action to try to meet the specifications (no further calculations are required in this step).