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.

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.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter19: Design Of Flexible Highway Pavements

Section: Chapter Questions

Problem 8P

See similar textbooks

Similar questions

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 .
(i) It is proposed to widen and strengthen the existing 2-lane NH section as a divided highway. The existing traffic in one direction is 2500 commercial vehicles (CV) per day. The construction will take 1 year. The design CBR of soil subgrade is found tobe 5 per cent. Given : traffic growth rate for CV = 8 per cent, vehicle damage factor =3.5 (standard axles per CV), design life = 10 years and traffic distribution factor =0.75. Calculate the cumulative standard axles.
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 msa using 2 decimal places.
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 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 msa
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 *
A proposed highway is to be designed with adequate shoulder and clearance in a level terrain with the following: AADT = 40,000 pcu/day D% = 70% K = 7% Solve for: the volume to capacity ratio of four-lane two-way highway with lane width of 4 meters.
A 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.
The proposed roadway has the following specifications: 1) rural road 2) design speed = 50 kph 3) radius of curvature = 192m; 4) 3-lane two-way direction 5) use maximum superelevation, emax= 8% Calculate the superelevation rate and coefficient of friction to be implemented in the road design.
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.
A 40km gravel surfaced road on a reasonably good alignment, is now carrying an annual average daily traffic of 100 vehicles (10% trucks). The traffic is expected to grow at an annual rate of 5% compounded (for each road type and all vehicles). The minimum attractive rate of return is 10% per annum. It is proposed to pave the road with minor reconstruction and the rest of the project details are shown in Table 1 below. Determine the benefits and costs after the year of paving
the 15 year design traffic loading is 5× 10^5, design suitable pavement structures by using Modified Shell Method. If the subgrade CBR = 2.5, and CBR=6.
A 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 design