Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 19, Problem 10P
To determine
The design of a suitable pavement consisting of a granular subbase, a granular base layer and an asphalt concrete surface.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Discuss various tests used for the quality of bitumen used in flexible pavements
Subject. Transportation engineering.
The 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.
A pavement was designed to have 50 mm bituminous surface course, bituminous
binder course 190 mm, 200 mm crushed aggregate road base, and 150 mm granular
subbase. The designed was based on the number of ESALs for the base year is 1.4
million, design period is 20 years and average annual traffic growth factor is 4.5%.
Using these data:
Determine the Subgrade modulus design input value and Estimate the design traffic (ESAL DES).
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- 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 pt = 2.5. The percent of traffic on the design lane is 45%. The design life is 20 years and the vehicle mix is: Passenger cars (1000 lb/axle) = 60% 2-axle single-unit trucks (5000 lb/axle) = 30% 3-axle single-unit trucks (7000 lb/axle) = 10% 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 mi values = 1. Use a reliability level of 85%, a standard deviation of 0.45, and a design serviceability loss of 2.0.arrow_forwardQ:Discuss various tests used for the quality of bitumen used in flexible pavements.arrow_forwardA flexible pavement is constructed with 4 inches of hot-mix asphalt wearing surface, 10 inches soil cement base and 10 inches crushed stone subbase. The subgrade has a soil resilient modulus of 12,000 lb/in2, M2 = 1.5 and M3=1.127 for the materials of the pavement structure. The overall standard deviation is 0.5, the initial PSI = 5.0 and the terminal serviceability index (TSI) is 2.5. The daily traffic has 3000 cars, 1000 trucks and 500 trailers. The axle weights are: How long in years would the pavement last if R = 98% ? (Final answer to 2 decimal places)arrow_forward
- i need an answer immediately thank you Design the thickness of a pavement to carry a wheel load of 52kN based on the following conditions and type of pavement. 3. A flexible pavement with an allowable subgrade pressure of 0.14MPa and the max. tire pressure equal to 0.52MPa. This pressure is assumed to be uniformly distributed over the area of tire contact on the roadway according to the principle of cone pressure distribution.arrow_forwardYou 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 600lb/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, ¨PSI 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 thicknessarrow_forwardA northbound direction on an interstate highway consists of four lanes of flexible pavement. It is conservatively designed with a 10-inch sand-mix asphaltic surface, 10-crushed stone base, and a 10-inch crushed-stone subbase (all drainage coefficients are 1.0). The subgrade CBR is 3, the overall standard deviation is 0.4, and the reliability is 95%. The initial PSI is 4.6 and the final PSI is 2.5. Daily total northbound road traffic consists of 51,000 cars (each with two 2-kip single axles), 840 buses (each with two 20-kip single axles), and 1,000 heavy vehicles (each with one 12-kip single axle and two 34-kip tandem axles). How many years was this pavement designed to last?arrow_forward
- A thin sealed unbound granular pavement is comprised of a 300mm CBR-60 Base sitting on a 300mm CBR-10 Sub-base sitting on a CBR-4 subgrade. Estimate the maximum design traffic – DESA for this pavement. Draw the possible pavement layer thickness arrangements.arrow_forwardTraffic loading, material characteristics and environmental conditions, are among the factors that influence pavement performance. Environmental conditions can have a particularly significant impact on the performance of low-volume road pavements. Discuss how environment conditions can effect at Cameron Highland road.arrow_forwardA flexible pavement was designed for the following daily traffic with a 12-year design life: 1300 single axles at 8,000 lb each, 900 tandem axles at 15,000 lb each, 20 single axles at 40,000 lb each, and 200 tandem axles at 40,000 lb each. The highway was designed with 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphaltic base, and 8 inches of crushed stone subbase. The reliability was 70%, overall standard deviation was 0.5, ¨PSI was 2.0 (with a TSI of 2.5), and all drainage coefficients were 1.0. What was the soil resilient modulus of the subgrade used in design?arrow_forward
- Discuss about the effect of overloading of trucks to the pavement condition.arrow_forwardA flexible pavement is constructed with 5 inches of sand-mix asphaltic wearing surface (a = 0.35), 9 inches of dense-graded crushed stone base (a = 0.18), and 10 inches of crushed stone subbase (a = 0.11). The base has a drainage coefficient of 0.90 while the subbase drainage coefficient is 1.0. Determine the structural number of the pavement.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 Solve for the design traffic in msa using 2 decimal places.arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
Traffic and Highway EngineeringCivil EngineeringISBN:9781305156241Author:Garber, Nicholas J.Publisher:Cengage Learning
Traffic and Highway Engineering
Civil Engineering
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Cengage Learning