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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Question
Chapter 4, Problem 18P
To determine
The design life of the rigid pavement when the modulus of subgrade reaction is changed.
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New flexible pavement is designed based on the following condition, use the design chart:
5.(e) Design the pavement section by triaxial test method using
the following data:
Wheel load = 4100 kg
Radius of contact area = 15 cm
Traffic coefficient, X = 1.5
Rainfall coefficient Y = 0.9
Design deflection A = 0.25 cm
E-value of subgrade soil E = 100 kg/cm²
E-value of base course material E = 400 kg/cm²
E-value of 7.5 cm thick bituminous concrete surface course =
1000 kg/cm2
The traffic on the design lane of a proposed four-lane rural interstate highway consists of 25% 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
1885, pi = 4.2.
Growth rate = 6.5%
%3D
SN,
Design life = 20 yrs
Reliability level = 95%
Standard deviation = 0.45
Surface course
DI
%3D
SN2
%3D
D2
%3D
SN3
Base course
Subbase course
D3
Roadbed course
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 courses are 70 and 22, respectively, and Mr for the asphalt mixture, 3102 MPa
(450,000 lb/in?).
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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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
- Question It is required to design a collector road pavement in an urban area composed of 3 layers with different material and resilient modulus values as shown in Figure 1. Given, ESAL=1.0*106, drainage quality is good. Less than 25% of the time the pavement will be exposed to moisture levels approaching saturation. Determine the thickness of the pavement courses layers. Assume So=0.35 and APSI=2.0. HMA surface Untreated base course Sand gravel subbase E1-500000 psi D1 E2= 20000 psi D2 E3=15000 psi D3 MR=5500 psiarrow_forwardFill in the following blanks: 1. . . is a collapse of pavement structure or a breakdown of one or more pavement components. 2. For soils that have particle sizes between 3. The thickness design of flexible pavement is influenced by the 4. The scale Present Serviceability Index (PSI) ranges from .... considered as sand. 5. The traffic load is determined in terms of a single-axle load applied to the pavement on two sets of dual tires which is ... lb.arrow_forwardCorrect answer will upvotearrow_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. A pavement with maximum CBR value of 8% for the subgrade soil supporting this load. The tire pressure is equal to 4kg/cm².Use U.S. Corps of Engineers Formula.arrow_forwardA conventional flexible pavement has been periodically checked for accumulated permanent deformations in various layers using a multi-depth deflectometer (MDD). The following subgrade soil rut data were obtained: Subgrade Soil Rut (in.) Number of 18-kip Axle Loads 0.1 10,000 0.225 100,000 Estimate the rut depth contributed by the subgrade soil for 1-million 18-kip axle loads.arrow_forwardGiven: Design ESAL = 5 x 106 Initial serviceability index = 3.5 Terminal serviceability = 2.5 Standard deviation = 0.5 Reliable = 90%arrow_forward
- Please solve all the questions askedarrow_forwardQ#1: (a) Explain the working mechanism of Flexible pavements. (b) What are the main factors that the designers prefer Flexible pavements over the Rigid pavements?arrow_forwardThe 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 1000, pi=4.2 and pt=2.5. Growth rate= 4% Design life= 20 years Reliabilitylevel= 90% Standard deviation= 0.45 The pavement will be exposed to moisture levels approaching saturation 20% of the time, and 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, 450kips/in2.arrow_forward
- Question is in the image.arrow_forwardqtextarrow_forwardB. A rigid pavement with a 10-inch slab thickness, 90 percent reliability, E. = 4 million Ib/in?, 600 lb/in? modulus of rupture, 150 lb/in³ modulus of subgrade reaction, a 2.8 load transfer coefficient, initial PSI of 4.8, final PSI of 2.5, overall standard deviation of 0.35, and a drainage coefficient of 0.8 is designed. The pavement's design life is 20 years. The three-lane road is built for vehicles with one 20,000-pound single axle, one 26,000-pound tandem axle, and one 34,000-pound triple axle. Calculate the projected daily truck traffic on the three lanesarrow_forward
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