Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 19, Problem 19P
To determine
The expected rut depth of the fourth layer.
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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.
Given data:
35% of traffic belongs to SAST group, LSF = 1.3, fcf = 4.5 MPa, NDT = 5e7 HVAGs
12. Refer to Figure II-1 attached. A flexible pavement is to be evaluated according to the AASHTO 1972 design guide. The existing pavement has a weighted structural number=3.4, a regional factor=2.0, and a soil support value=4.5. What would be the approximated number of daily equivalent 18-kip axles to be allowed on this road for a 20-year analysis period?a. 10b. 33c. 100d. 1490
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- 12.7 Figure P12.7 shows a concrete pavement with the thicknesses and elastic moduli as indi- cated. Assume a modulus of rupture of 650 psi, a load transfer coefficient of 3.2, a service- ability loss from 4.5 to 2.0, and poor drainage with 5% of time near saturation. Determine the performance traffic by Eq. 12.21 without the reliability term and check the result by the AASHTO design chart. [Answer: 8.5 × 106] Portland Cement Concrete E = 4 x 106 psi Granular Subbase ESB = 30,000 psi Subgrade MR = 5000 psi 8 in. 8 in. FIGURE P12.7arrow_forwardIf 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_forward2. You are asked to design a new flexible pavement structure for an existing road that will be totally replaced. You are provided with the following borehole results: a) Existing (Old) HMA - 135 mm b) Existing (Old) Granular A Base - 170 mm c) Existing (Old) Granular B Subbase - 340 mm d) Gravelly Silty Sand (Till) Subgrade (25 % 5-75 um) What is the current GBE for the existing pavement structure? What is the GBE for the same pavement structure when it was newly constructed?arrow_forward
- Q: Evaluate whether 9in of slab thickness for rigid pavement will be adequate on a rural expressway for 20-year analysis period if design criteria are as follows: Pi = 4.5 Pt =2.5 ESAL over design period = 6* 10 Concrete Elastic modulus, Ee = 5*106 Ib/in? %3D Mean Concrete modulus of Rupture 700 Ib/in? Drainage Coefficient Ca = 1.0 R = 0.95 So = 0.3 K = 170 Ib/in %3D Load transfer coefficient = 3.2arrow_forwardQ3: Evaluate whether Sin of slab thickness for rigid pavement will be adequate on a rural expressway for 20-year analysis period if design criteria are as follows: (30 Marks) Pi = 4.5, Pi=2.5, ESAL over design period = 10* 10, Concrete Elastic modulus, E, 6.5*10 Ib/in', Mean Concrete modulus of Rupture 800 Ib/in', Drainage Coefficient C= 1.0, R=0.95, S. = 0.3, K = 100 Ib/in', Load transfer coefficient 3.2arrow_forwardCase Study 2: Determine the expected AADT over the 10 year design period in one direction if the initial traffic in 2020 data is 1970, the first 5 year has 5% growth rate and the remaining years is 4%. The total traffic distribution is car/jeep 44%, buses = 26% and truck = 30%. Design the thickness of the flexible %3D pavement using the Road Note Catalogue 31 and the CBR of the subgrade is 5%. What is 80 equivalent single application load of the significant damage to pavement of bus = 0.45 and truck = 1.0.arrow_forward
- A 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 bearrow_forwardDetermine the base thickness of plain concrete pavement (PCP) without dowelled joints using the information and charts provided be • Desired project reliability - 85% Subgrade design CBR-6% • Design period -30 years • Design Traffic 5.0*10* HVAG(B) Note: The information obtained from each table or figure must be stated in the examination script to obtain relevant marks. Table 3.1: Minimum subbase requirements for rigid pavements Design traffic (HVAG) Subbase type 125 mm bound Up to 10⁰ Up to 5x10 150 mm bound or 125 mm LCS Up to 1x10 170 mm bound or 125 mm LCS 150 mm LCS Greater than 1x 10 1 Under CRCP, a heavily bound subbase with an asphalt surfacing is an acceptable alternative 75 Maximum permitted value CBR % Effective subgrade strength used in concrete base thickness determinations 60 50 40 35 30 25 20 15 12 10 Concrete Base 200 Thickness 190 (mm) 180 8. Pavement type 7. 6. 5. PCP Dowelled & CRCP 260 250 240 230 220 210 170 160 150 140 150mm LCS 125mm LCS 8 10 Design subgrade…arrow_forwardQuestion is in the image.arrow_forward
- need it correctlyarrow_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_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_forward
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