Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Chapter 4, Problem 4P
To determine
The minimum acceptable soil resilient modulus.
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2. Estimate the equivalent 18-kip single-axle load applications (ESAL) for a four-lane pavement (two lanes in each direction) of a rural interstate highway with a truck count of 1,200 per day (including 2-axle, 4-tire panel, and pickup trucks), an annual growth rate of 4%, and a design life of 20 years.
A flexible pavement has the following class loads
during a particular hour of the day.
i.
ii.
80 buses with 2-axles (each axle load of
40 kN) ;
ii. 160 trucks with 2-axles (from and
rear axle loads of 40 kN and 80 kN,
respectively)
Find the equivalent standard axle load
repetitions for this vehicle combination as per
IRC 37-2012.
A roadway project will be constructed in 2026 as flexible pavement, pt= 2.5, expected SN=4
and has a 20-year design life. Design work was done in 2021, with growth rate of 6%. The
traffic survey gives axles loads shown in table above. Find the design ESAL according to
AASHTO design method.
Truck type
Type-1
Type-2
Type-3
Type-4
Type-5
Type-6
Axle Category
1-single axle of 30 kips
1- tandem axle of 32 kips
1-single axle of 18 kips
2- tandem axle of 40 kips
1-single axle of 20 kips
1- tandem axle of 36 kips
1- tandem axle of 50 kips
2-single axle of 38 kips
1- tandem axle of 52 kips
2-single axle of 14 kips
1- tandem axle of 32 kips
1- triple axles of 50 kips
1-single axle of 40 kips
1- tandem axle of 32 kips
Type-7
CS CamScanner triple axies of 58 kips
J
2-single axle of 22 kips
1- tandem axle of 38 kips
% Total AADT
9%
10%
7%
5%
3%
5%
4%
12:
Chapter 4 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
Ch. 4 - Prob. 1PCh. 4 - Prob. 2PCh. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10P
Ch. 4 - Prob. 11PCh. 4 - Prob. 12PCh. 4 - Prob. 13PCh. 4 - Prob. 14PCh. 4 - Prob. 15PCh. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - Prob. 18PCh. 4 - Prob. 19PCh. 4 - Prob. 20PCh. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - Prob. 24PCh. 4 - Prob. 25PCh. 4 - Prob. 26PCh. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - Prob. 29PCh. 4 - Prob. 30PCh. 4 - Prob. 31PCh. 4 - Prob. 32P
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- If the pavement structure number (SN) is equal to 1 and the terminal serviceability index (TSI) is 2.5. what would be the ESAL value that would correspond to a tandem axle load of 18,000 pounds? O 1.000 O.0.070 O 0.018 O 2000arrow_forwardA section of a two-lane rural highway is to be realigned and replaced by a four-lane highway with a full-depth asphalt pavement. The AADT (both ways) on the existing section can be represented by 500 ESAL. It is expected that construction will be completed 5 years from now. If the traffic growth rate is 5 percent and the effective CBR the subgrade on the new alignment is 8.5, determine a suitable depth of the asphalt pavement (in inches) using the AASHTO method. Take the design life of the pavement as 20 years. The resilient modulus of the asphalt (EAC) is 400,000 lb/in.². Assume m, for the subgrade is 1 and the percent of traffic on the design lane is 45 percent. Use a reliability level of 90 percent, a standard deviation of 0.45, and a design serviceability loss of 2.0. inchesarrow_forwardA flexible pavement has the following class of loads during a particular hour of the day, i. 80 buses with 2-axles (each axle load of 40 KN): ii. 160 trucks with 2-axles (front and rear axle loads of 40 kN and 80 kN, respectively) The equivalent standard axle load repetitions for this vehicle combination as per IRC:37-2012 would be A. 320 B. 250 C. 240 D. 180arrow_forward
- section of a two-lane rural highway is to be realigned and replaced by a four-lane highway with a full-depth asphalt pavement. 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. It is expected that construction will be completed five years from now, and pi =4.5 and pt = 2.5. Growth rate = 4%. Design life = 20 years. The pavement structure will be exposed to moisture levels approaching saturation 20% of the time, and it will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase are 70 (Mr=30000 lb/in2 ) and 22 (Mr=13500 lb/in2 ), respectively, and Mr for the asphalt mixture, 400,000 lb/in2 .arrow_forward2 a. The scales reading the weight of each truck were reading 10% low. Calculate the ESAL for the following truck, assuming flexible pavement for both the axle/axle group weight and the weight increased by 10% 12,000 lbs 40,000 lb shoporst 20,000 b. Calculate the ESAL for the above truck, assuming rigid pavement. 20,000arrow_forwardAn existing rural four-lane highway is to be replaced by a six-lane divided expressway(three lanes in each direction). Traffic volume data on the highway indicate that theAADT (both directions) during the first year of operation is 24,000 with the followingvehicle mix and axle loads.Passenger cars 50%2-axle single-unit trucks (12,000 lb/axle) 40%3-axle single-unit trucks (16,000 lb/axle) 10%The vehicle mix is expected to remain the same throughout the design life of 20 years,although traffic is expected to grow at a rate of 3.5% annually. Using the AASHTOdesign procedure, determine the minimum depth of concrete pavement required forthe design period of 20 years.R 95%So 0.3Cd 1.0J 3.2k 130Ec 5 106lb>in.2S¿c 650 lb>in.2Pt 2.5Pi 4.5arrow_forward
- Given a concrete pavement with a thickness of 8 in. (203 mm), a kvalue of 100 pei (37.1 MN/m³) doweled joints, and no concrete shoulders, determine the allowable repetitions under a 54-kip (240-kN) tridem-axle load based on erosion enteria. The Question is related to Highway and transportation Engineering.arrow_forwardCalculate ESAL in the design lane for 20 year design period for asphalt (assume TSI= 2.5) and concrete (assume TSI= 2.5 and D = 9 inch) pavement, respectively, based on the initial traffic of single axle-loads shown below, given that the yearly rate of growth 2%, Direction Distribution Factor -50%, Lane Distribution Factor = 75% Axle Load Number (kip) 18 20 22 24 26 28 30 32 34 per day 61.4 47.2 21.4 12.9 6.1 2.9 1.2 0.7 0.3arrow_forwardThe AADTT of a 2-way (2-lane each way) highway is 10,000. The directional distribution may vary between 45 and 55% depending on season. The lane distribution may vary between 60 and 75%. The driving lane always carries more loads compared to the passing lane. The growth factor for the pavement is 3.5%. Based on the above information, calculate the design AADTT for the driving lane if the pavement service life is 20 years.arrow_forward
- 3. 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 48,050 lb each. The highway is to be designed with rigid pavement having a modulus of rupture of 600 lb/in? and a modulus of elasticity of 5 million lb/in. The reliability is to be 95%, the overall standard deviation is 0.4, the drainage coefficient is 0.9, APSI 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/in'. If a 20-year design life is to be used, determine the required slab thickness.arrow_forwardQ2: 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 1150, pi = 4.5, and pt = 2.5 . Growth rate = 3% Design life = 20 years Reliability level = 95% Standard deviation = 0.45 The pavement structure will be exposed to moisture levels approaching saturation 20% of the time, and it will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase are 70 and 22, respectively, and Mr for the asphalt mixture, 3102 MPa (450,000 lb/in2).arrow_forwardA roadway project will be constructed in 2026 as flexible pavement, pt-2.5, expected SN= 4 and has a 20-year design life. Design work was done in 2021, with growth rate of 6%. The traffic survey gives axles loads shown in table above. Find the design ESAL according to AASHTO design method. Truck type Axle Category Type-1 1-single axle of 30 kips 1- tandem axle of 32 kips 1-single axle of 18 kips 2- tandem axle of 40 kips 1-single axle of 20 kips 1- tandem axle of 36 kips 1- tandem axle of 50 kips 2-single axle of 22 kips 1- tandem axle of 38 kips 2-single axle of 38 kips 1- tandem axle of 52 kips 2-single axle of 14 kips 1- tandem axle of 32 kips 1- triple axles of 50 kips 1-single axle of 40 kips 1- tandem axle of 32 kips CS Cams Typer triple axies of 58 kips Type-2 Type-3 Type-4 Type-5 Type-6 % Total AADT 9% 10% 7% 5% 3% 5% 4%arrow_forward
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