15. An asphalt concrete mixture is to be designed according to the Marshall procedure. A PG 58-28 asphalt cement with a

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15 An Asphalt Concrete Mixture Is To Be Designed According To The Marshall Procedure A Pg 58 28 Asphalt Cement With A 1 (80.7 KiB) Viewed 30 times

15. An asphalt concrete mixture is to be designed according to the Marshall procedure. A PG 58-28 asphalt cement with a specific gravity of 1.00 is to be used. A dense aggregate blend is to be used, with a maximum size of 19 mm and bulk specific gravity of 2.696. The theoretical maximum specific gravity of the mix is 2.470 at 5 % asphalt content. Trial mixes were made, with the average results shown in the table below. Asphalt Contont, % by Weight Bulk Spocific Gravity Stability, N Flow, 0.25 mm 4.0 2.303 7076 9 4.5 2.386 8411 10 5.0 2.412 7565 12 5.5 2.419 5963 15 6.0 2.421 4183 22 Plot the appropriate graphs necessary for the Marshall procedure, and select the optimum asphalt content using the Asphalt Institute design criteria for medium traffic Assume a design air void content of 4% (10 Marks)