Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Chapter 21, Problem 10P
To determine
Thevalue of skid number and to characterize the pavement type.
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Compute the thickness of a flexible
pavement for a wheel load of 55 kN, if the
allowable bearing pressure on the base of
the pavement is 0.15 MPa and the
equivalent radius of the contact area of the
tires is equal to 170 mm.
Determine the thickness of the flexible pavement for a wheel load of 50KN, if the allowable
bearing pressure on the base of the pavement is 0.15MPa and the equivalent radius of the
contact area of the tires is equal to 165mm. answer should be in mm.
The braking distance of a car from 90 km/h is 40 m assuming the pavement is level.
(a) if the pavement is with 5° inclination, what will be the braking distance (in meter) of the car going up from 90km/h?
(b) and if the car is going down at 6% inclination, what is its braking distance (in meter) from 90km/h?
Note: Assume the breaking force is not dependent of the grade.
Select the correct response(s):
O 42.71
O 45.78
O 52.34
O 43.25
O 54.12
O 46.77
O 34.30
O 36.05
O 44.13
O 40.95
O 41.96
O 50.90
O O
O O O O O O O
Chapter 21 Solutions
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- The braking distance of a car from 90 km/h is 40 m assuming the pavement is level. (a) if the pavement is with 5° inclination, what will be the braking distance (in meter) of the car going up from 90km/h? (b) and if the car is going down at 6% inclination, what is its braking distance (in meter) from 90km/h? Note: Assume the breaking force is not dependent of the grade.arrow_forwardQ5. Given the following information: A concrete pavement for two lane highway has doweled joints and no concrete shoulders. The modulus of subgrade reaction is 200 pci (54.2MN/m3), and the modulus of rupture is 650 psi (4.5Mpa). Assume a load safety factor of 1.1. truck weight distribution data for single axle load is as follows: Axle load(kips) 1 Single axles 28 Multiplied by LSF (1.1) 26 24 2 Expected repetitions 3 Erosion analysis Allowable repetitions 30.8 5,913 28.6 12,483 26.4 15,111 22 24.2 102,492 Using a trial thickness of 8 in. Fill in the empty spaces using PCA design method 4 6. Erosion factor Erosion percent 5arrow_forwardThe braking distance of a car from 120 km/h is 50 m assuming the pavementis level. (a) if the pavementis with 6° inclination, what will be the braking distance (in meter) of the car going up from 120km/h? (b) and if the car is going down at 2% inclination, what is its braking distance (in meter) from 120km/h? Note: Assume the breaking force is not dependentof the grade. Select the correctresponse(s): 50.90 O 41,96 O 46,77 O 54.12 O 36.05 O 45.78 O 42.71 O 40.95 O 34.30 O 43.25 44.13 O 52.34arrow_forward
- Subject : Transportation Engineering Read the question carefully and give me right solution according to the question. Note: solve by using 45-deg cone pressure distribution method only The maximum wheel load that the pavement could carry is 120 kN. If the contact radius of the wheel is assumed to be 250 mm, and subgrade bearing capacity is equivalent to 0.24 Megapascals, calculate the subgrade layer thickness of the flexible pavement in mm using the 45-deg cone pressure distribution method.arrow_forwardCalculate the equivalent radius of the contact area of tires considering the wheel load is 60 kN.Allowable bearing pressure on the base of the pavement is approximately 0.20 MPa and thethickness of pavement is calculated as 160 mm. Round up the answer in 10 mm interval.arrow_forward6.1 A set of dual tires is spaced at 34 in. center to center and carries a total load of 45,000 lb with a tire pressure of 100 psi. Assuming the pavement to be a homogeneous half-space, determine the ESWL for a pavement of 25 in. using (a) the Boyd and Foster method, (b) the Foster and Ahlvin method, and (c) Huang's chart based on equal contact radius. [Answer: 32,200 lb, 32,800 lb, 32,800 lb]arrow_forward
- A dual wheel having a load per tire of 4000 Ib, 80 psi pressure and μ = 0.5. Calculate thetotal pavement deflections due to the dual wheel by two layer theory at the followingradial distances from the centerline of one tire: r=0, 7,14. Assume that E1 = 10 E2arrow_forwardYou have been asked to design a flexible pavement and the following daily traffic is expected for design: 6375 passenger cars with two 2-kip single axles, 375 18-wheel trucks with one 12-kip single axle and two 32-kip tandem axles, 225 triple-trailer trucks with one 18-kip single axle and six 36-kip tandem axles, and 525 single unit trucks with one 10-kip single axle and one 24-kip tandem axle. There are 3 lanes in the design direction (conservative design is to be used). Assuming a structural number of 5.0, determine the design-lane 18-kip ESALs for the pavement projected 15-year design life with the TSI of 2.5.arrow_forwardShow transcribed image text 1. Truck A has two single axles. One axle weighs 12,000 Ib and the other weighs 23,000 lb. Truck B has an 8000-lb single axle and a 43,000-lb tandem axle. On a flexible pavement with a 3-inch hot-mix asphalt (HMA) wearing surface, a 6-inch soil-cement base, and an 8-inch crushed stone sub base, which truck will cause more pavement damage? (Assume drainage coefficient are 1.0.) Hints: use linear interpolation if SN is not integer. 2. A highway has the following pavement design daily traffic: 300 single axles at 10,000 lb each, 120 single axles at 18,000 lb each, 100 single axles at 23,000 Ib each, 100 tandem axles at 32,000 lb each, 30 single axles at 32,000 lb each, and 100 triple axles at 40,000 lb each. A flexible pavement is designed to have 4 inches of sand-mix asphalt wearing surface, 6 inches of soil- cement base, and 7 inches of crushed stone sub base. The pavement has a 10-year design life, a reliability of 85%, an overall standard deviation of 0.30,…arrow_forward
- You have been asked to design the pavement for an access highway to a major truck terminal. The design daily truck traffic consists of the following: 80 single axles at 22,500 lb each, 570 tandem axles at 25,000 lb each, 50 tandem axles at 39,000 lb each, and 80 triple axles at 48,000 lb each. The highway is to be designed with rigid pavement having a modulus of rupture of 600 lb/in2 and a modulus of elasticity of 5 million lb/in2. The reliability is to be 95%, the overall standard deviation is 0.4, the drainage coefficient is 0.9, ΔPSI is 1.7 (with a TSI of 2.5), and the load transfer coefficient is 3.2. The modulus of subgrade reaction is 200 lb/in3. If a 20-year design life is to be used, determine the required slab thickness.arrow_forwardCalculate the average skid resistance of the pavement surface when a vehicle travelling at a speed of 35 kmph was stopped by applying brakes fully? (Assume the skid marks were 6 m in Length.)arrow_forwardProblem 1 The total load on a tridem axle is 44 kip. Consider a p, of 2.5 and SN of 4. Calculate the EALF considering flexible pavement.arrow_forward
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