You are currently working for the City and you have to select a performance grade asphalt binder for a paving project. Local weather statistics: High 7 day air temperature Low 1 day air temperature Latitude: 20.63° Avg 33.1° C 2 standard deviations -39.6° C Longitude: 104.67° 2.2 3.9 Elavation:557m A) Calculate the low pavement design temperature and high pavement design temperature at 50% reliability and 98% reliability. B) What PG grade asphalt would you choose at 50% reliability and 98% reliability? C) Considering at the intersections with stop signs the PG should upgraded by 2, which PG asphalt binder would you recommend for?

You are currently working for the City and you have to select a performance grade asphalt binder for a paving project. Local weather statistics: High 7 day air temperature Low 1 day air temperature Latitude: 20.63° Avg 33.1° C 2 standard deviations -39.6° C Longitude: 104.67° 2.2 3.9 Elavation:557m A) Calculate the low pavement design temperature and high pavement design temperature at 50% reliability and 98% reliability. B) What PG grade asphalt would you choose at 50% reliability and 98% reliability? C) Considering at the intersections with stop signs the PG should upgraded by 2, which PG asphalt binder would you recommend for?

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 11P

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Similar questions

Repeat Problem 19-7 using two different depths of untreated aggregate bases of 6 in. and 12 in. Highway contractors in your area can furnish rates for providing and properly laying an asphalt concrete surface and untreated granular base. Assume a structural coefficient of 0.12 for the base course. If these rates are available, determine the cost for constructing the different pavement designs if the highway section is 5 miles long and the lane width is 12 ft. Which design will you select for construction?
For the following temperature conditions, calculate the proper PG grade for both 50% and 98% reliabilities (show your calculation).Seven-day maximum pavement temperature of 48°C with a standarddeviation of 2.5°C. Minimum pavement temperature of -21°C with a standard deviation of 3°C.
A dual wheel having a load per tire of 5000 Ib, 70 psi pressure and μ = 0.5. Calculate thetotal pavement deflections due to the dual wheel by one-layer theory at the followingradial distances from the centerline of one tire: r=0, 3.5,10.5. (Use Pavement Thickness= 8in).
A flexible pavement has a structural number of 3.8(all drainage coefficients are equal to 1.0). The initialPSI is 4.7 and the terminal serviceability is 2.5. The soilhas a CBR of 9. The overall standard deviation is 0.40and the reliability is 95%. The pavement is currentlydesigned for 1800 equivalent 18-kip single-axle loadsper day. If the number of 18-kip single-axle loads wereto increase by 30%, by how many years would thepavement’s design life be reduced?
Q#3. Discuss root causes and remedial measures of the following distresses occurring in flexible pavements: Slippage failure, Potholes, Rutting and its types, Bitumen bleeding
11. The range of typical terminal serviceability indices (pt) used in design of highway pavements is:a. -1.0 and 0.0b. 0.0 and 1.0c. 2.0 and 2.5d. 10.0 and 20.0 14. In the AASHTO 1986 and 1993 design guide, the following modification(s) was(were) incorporated in the design procedure:a. Reliabilityb. Changes in modulus of elasticity subgrade materials due to climatec. Drainage layersd. All of the above15. Interstate highways should be designed for a lower level of reliability as compared to secondary roads.a. Trueb. False 17. In the Asphalt Institute flexible pavement design approach, Where are the critical stress and strain locations checked?a. Top of the asphalt concrete layerb. Middle of the asphalt concrete layerc. Bottom of the asphalt concrete layerd. Bottom of the asphalt concrete layer and top of the subgrade 19. In the Portland Cement Association (PCA) design of rigid highway pavements, the design approach is based on:a. Fatigue Damageb. Erosion Damagec. Both Fatigue Damage and…
Define pavement management system (PMS) and describe its benefits.
ex/ Comparison Between Flexible and Rigid Pavements? -The fuel that falls on the airport grounds, how does it affect Flexible and Rigid Pavements? -the price. -Ease of maintenance -need the pavements to maintenance.
Replace the 5 forces acting on the next pavement with a single force and position it so as to obtain a equivalent system.
A 7-day average high temperature of the pavement at a ¾” depth is expected to be 138 degrees F (std. dev. 3.5 deg. F), and the average low temperature in the pavement is expected to reach 10 degrees F (std. dev. 2.5 deg. F). The pavement will be used to repave the intersection of a busy local road. Address the following: a) Determine the performance grade of the asphalt that should be used for this pavement with 98% reliability. b) Discuss the general considerations for ductility of the binder for the conditions stated. c) If a penetration test yields a penetration of 8.5 mm into the asphalt, list its penetration grade, viscosity grade, and expected flashpoint. d) Discuss the suitability of the addition of lime to the pavement mix.
Write the significance of each layer of flexible pavement in a single line. B) Describe the one most important factor of causing failure of highway subgrade
Take rotation of pavement by inner edge.