Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 19, Problem 8P
To determine
A suitable depth of the asphalt pavement using the AASHTO method.
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A 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 750 ESAL. It is expected that construction will be completed 5 years from now. If the traffic growth rate is 2 percent and the effective CBR of the subgrade on the new alignment is 9.0, 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 450,000 lb/in.2. Assume
mi
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.
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
.
In one road project , for rehabilitation existing pavement by overlay technique , the effective structural number of existing pavement ( SNeff may be determined in two ways , NDT and condition survey . If the NDT value is 4.89 and the value of the condition estimation is 5.25 , the SNeff will be *
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- Assume that the overall pavement evaluation of Interstate highways in a district consists of four categories: Surface distress index = 75, drainage index = 80, roughness index = 85, and structural index = 90. For all indices, 100 represents the best condition. Calculate the overall pavement index (OPI) of the interstate highways in this district, if the relative weights of different indices are 0.20, 0.25, 0.28, and 0.27, respectively.arrow_forwardDesign is required for a new pavement to be constructed in 2010. The annual average daily traffic for commercial vehicles on the opening day will be 2000. Growth rate = 4% Design Life = 20 years Design is required for a new pavement to be constructed in 2010. The annual average daily traffic for commercial vehicles on the opening day will be 2000. Growth rate = 4% Design Life = 20 years Solve for the design traffic in msaarrow_forwardA transportation agency is planning a pavement roughness data collection program to monitor statewide pavement performance. Assuming that 10 percent of change in roughness should be detectable at 95% confidence level, how many 1-mile pavement segments should be included in the annual condition survey? There are 20,000 center-line miles of pavement in total.arrow_forward
- New flexible pavement is designed based on the following condition, use the design chart:arrow_forwardDetermine the required structure number of the pavement based on the following information: . . ESAL= 5 million Reliability = 99% Standard deviation = 0.45 • Pi = 4.5, Pt = 2.5 . Subgrade Mr=9,000psiarrow_forwardAn existing flexible airport pavement has 3-in. bituminous surface course, 4-in. stabilized base course, and 10-in. subbase. The CBR of the subgrade is 7 and that of the subbase is 13. Provide a flexible overlay to strengthen the pavement for 25,000 annual departures of a design aircraft with maximum weight of 75,000 lb. and 25 000 annual departures.arrow_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_forwardBriefly describe a suitable type of cutback bitumen to be used as a prime coat and tack coat in the road construction and give justification for each answer.arrow_forwardDESIGN OF A RIGID PAVEMENT1. Give a summary of rigid pavement design procedure by AASHTO method (1993), anddescribe the variables used in the method.2. Explain the CBR test; how to conduct the test and its purposes. Where are the usages oftest results in practical applications? Explain its advantages and disadvantages.3. Determine the thickness of a rigid pavement (thickness of concrete slab) by using thedata provided below:DATA PROVIDED:1. Cumulative 18kips ESAL = 5.000.0002. Overall standard deviation = 0.33. Reliability = 95%4. Design serviceability loose =1.75. Drainage coefficient = 16. Load transfer coefficient = 3.27. Mean concrete modulus of rupture = 650 psi8. Elastic modulus of the concrete to be used = 5.000.000psi9. Results of CBR test on subgrade material in the laboratory (Table 1):10. Standard force-penetration data.arrow_forward
- A grassy drainage area is paved with asphalt. What happens to the time of concentration? 1. increase 2. decrease 3. stays the same 4.not enough informationarrow_forwardA road of two lanes divided by a central island is at presem carrying a traffic of 1000 vehicles per day. This traffic is 80% cars and 20% trucks and their damage factors are 0.04 and 2 respectively For the design life of 15 years. the expected anual growth rate of traffic is 5.5%. Given the subgrade soil stiffness (Mg) is 7500 psi. Required a) Calculate the cumulative equivalent single axle load (ESAL) to be used in designarrow_forwardhighway engineering labartory CBR Test Report Discussion Points 1. Importance of the test.2. Which of basic properties of soil is represented by CBR test?3. How could the CBR value be used in pavement design?arrow_forward
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