1 An axle weight study on a section of a highway gave the following data on axle load distribution Axle Load Group Single (1000 lb) 4 4 8 8 12 12 16 16 18 18 20 20 22 22 24 24 26 No of Axles per 1000 Vehicles 678 775 500 150 60 40 7 4 3 Axie Loaa Group Tandem (1000 lb) 6 6 12 12 18 18 24 24 30 30 32 32 34 34 36 36 38 38 40 No of Axles per 1000 Vehicles 18 236 170 120 152 66 30 Passenger cars (1000 lb axle) 60 2 axle single unit trucks (5000 lb axle) 30 3 axle single unit trucks (7000 lb axle) 10 12 4 1 Determine the truck factor for this section of highway Assume SN 4 and p 2 5 2 A six lane divided highway is to be designed to replace an existing highway The present AADT (both directions) of 6000 vehicles is expected to grow at 5 per annum Assume SN 4 and p 2 5 The percent of traffic on the design lane is 45 Determine the design ESAL if the design life is 20 years and the vehicle mix is 3 Using the information given in Problem 2, design a suitable pavement consisting of an asphalt mixture surface with an elastic modulus of 250,000 lb in2, a granular base layer with a structural coefficient of 0 14 on a subgrade having a CBR of 10 Assume all m values 1, and the percent of traffic on the design lane is 45 Use a reliability level of 85 , a standard deviation of 0 45, and a design serviceability loss of 2 0 4 The traffic on the design lane of a proposed four lane rural interstate highway consists of 40 trucks If classification studies have shown that the truck factor can be taken as 0 45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1000, and p 4 2 and P 2 5 Growth rate 4 Design life 20 years Reliability level 95 Standard deviation 0 45

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1. An axle weight study on a section of a highway gave the following data on axle-load distribution: Axle Load Group: Single (1000 lb)

1. An axle weight study on a section of a highway gave the following data on axle-load distribution: Axle Load Group: Single (1000 lb)

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