Asphalt paving production and number of trucks required: Asphalt road paving pro

Question

Asphalt paving production and number of trucks required: Asphalt road paving project is 3,000-ft long, 60-ft wide, and 6-inch thick. Other data follows: Asphalt rear-dump trucks are used for 20-ton hot-mix asphalt (HMA) load hauling from an asphalt plant to the paving site. (Truck cycle time is sum of loading time, hauling time, dumping/unloading time, and return time.) Maximum output capacity of the plant is 150 tons per hour and operating efficiency factor is 0.8. Most of the haul road is in good paved condition. Total haul distance is 5 miles (on average grade + 1.25 % during haul). Each dump truck (empty weight 40,000 lb) is used at high tire pressure for transporting a full load of 20-ton. The dump trucks must keep the asphalt paver busy paving with adequate quantity of HMA to avoid cold joints. Paving capacity of the asphalt paver used for laying 12-ft wide lane (6-inch thick) is 40,000 lb at paving production rate of 53 linear ft paved in 20-minutes assuming 60-minute hour efficiency, which is adequate to dump one truck load in the paver hopper and pave. The paved HMA has a typical unit weight of 145 lb left behind the paver. (a) Calculate the truck cycle time, number of trucks, and total number of truck trips for hauling plan mixed HMA from the plant to the road construction project site. Use the following data: (b) Calculate the asphalt pavement production rate and total number of hours to complete the paving project.

Explanation / Answer

road dimension is

3000 ft x 12 ft x 0.5 ft

total asfalt needed = 3000*12*0.5*145/2000 =1305 tonn

maximum capacity of truck is 20 tonn

no of trip require = 1305/20=65.25= 66 trip

cycle time should be 20 min bicause in 20 min paver taking 20 tonn HMA

prodection rate should be

20*60/20= 60 tonn/hr

and total time require = 3000/53 =18.86 = 19 hr

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