4. A compacted aggregate bed measuring 2000 ft x 48 ft x 6 in. is to be constructed at a minimum dry density (Wary/Volume of bed) = 125 lb/ft. There is no requirement for the permeability of the bed. Determine the weigh-out for an aggregate stockpile with a moisture content of 2.7% the aggregate absorption is 1.5%. a. How much aggregate should be weighed out? b. How much of this water is defined to be "free water"? c. The aggregate source has a specific gravity of 2.673 what is the actual volume of stone (including the permeable and impermeable voids) used in this bed? d. The quarry can supply the aggregate for the bed using three different stockpiles, a single sized %" stone (cheapest), a gap graded blended stockpile (next cheapest), and a densely graded aggregate base course (ABC) material (most expensive). The results from a dry rodded unit weight test are summarized below. Assuming that the DRUW test accurately represents the maximum level of compaction possible in the field, determine which stockpile should be purchased. Show the calculations that support your answer. [Hint: You want to choose the stockpile with DRUW test values which are closest to the % voids, calculated using the formula below. Total Volume here refers to the volume of the aggregate bed. Aggregate volume refers to the volume of aggregate including permeable and impermeable pores] V 1- V 1otal %Voids aggregate x100 % Voids Stockpile " Uniformly Graded Gap Graded ABC Densely Graded 55 32 20