Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 19, Problem 12P
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A flexible pavement is constructed with 4 inches of hot-mix asphalt (HMA) wearing surface, 8 inches of emulsion/aggregate-bituminous base, and 8 inches of crushed stone subbase. The subgrade has a soil resilient modulus of 10,000 lb/in^2, and M2 and M3 are equal to 1.0 for the materials in the pavement structure. The overall standard deviation is 0.5, the initial PSI is 4.5, and the TSI is 2.5. The daily traffic has 1080 20-kip single axles,400 24-kip single axles, and 680 40-kip tandem axles. How many years would you estimate this pavement would last (how long before its PSI drops below a TSI of 2.5) if you wanted to be 99%confident that your estimate was not too high
Compute the modulus of elasticity of the pavement if the modulus of elasticity of the subgrade is90 MPa with a stiffness factor of 0.55
Problem No. 1A flexible pavement for an urban interstate highway is to be designed using the AASHTO method to carry a design ESAL of 3 x 106. It is estimated that it takes about a week for water to be drained from within the pavement and the pavement structure will be exposed to moisture levels approaching saturation for 30% of the time. The following additional information is available:
Elastic modulus of asphalt concrete = 450,000 psiResilient modulus of base material = 35,000 psiResilient modulus of subbase material = 15,000 psiCBR of subgrade material = 8
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- 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.arrow_forwardFlexible Pavement Design Assume the thickness of Base Course and Sub Base Course. Compute the SN of Asphalt, Asphalt treated Base, Base course, and Sub base course. Compute the thickness of Asphalt and Asphalt Treated Base.arrow_forwardQ:Discuss various tests used for the quality of bitumen used in flexible pavements.arrow_forward
- A 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_forwardi 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_forwardIf pavement and sub grade are considered as two layer system a stiff factor is to be introduced to take into account the different values of modulus of elasticity of the two layers. if the modulus of elasticity of the subgrade is 100 kg/cm2 and the modulus of elasticity of the pavement is 1000kg/cm2, what is the stiffness factor ?arrow_forward
- A pavement consists of 5 inches of asphalt underlain by a crushed stone based course. There is no sub base. The asphalt has an elastic modulus of 350,000 psi at room temperature and the base course has a CBR of 70. Determine the thickness of the crushed stone base needed to reach an SN of 2.85. Assume the base course is saturated 5% of the time and drains within a day.arrow_forwardCompute the modulus of elasticity of pavement if the modulus of elasticity of subgrade is 15MPa with a stiffness factor of 0.50.arrow_forwardDiscuss various tests used for the quality of bitumen used in flexible pavements Subject. Transportation engineering.arrow_forward
- an interstate highway pavement composed of a hma surface course, a cement treated base course, and a sand–gravel subbase is to be designed for an esal of 1.2*10^6.the quality of drainage is considered fair because water can be removed from the subbase within a week. however, there is a large amount of precipitation, so more than 25% of the time the pavement will be exposed to moisture levels approaching saturation. the material properties are as follows: effective roadbed soil resilient modulus = 5,500 psi, resilient modulus of subbase = 15,000 psi, unconfined compressive strength of cement-treated base at 7 days = 500 psi, and resilient modulus of hma = 4.3*10^5 psi. assuming a minimum thickness for hma, determine the thicknesses of the surface, base,and subbase courses required. Assuming a minimum thickness for HMA, determine the thicknesses of the surface, base,and subbase courses required.arrow_forwardMechanistic design procedure is based on the assumption that a pavement can be modelled as multi-layered elastic or viscoelastic. Discuss the combination of Visco-elastic considerations assumption in pavement design procedure.arrow_forwardA flexible pavement has a structural number of 3.8 (all drainage coefficients are equal to 1.0). The initial PSI is 4.7 and the terminal serviceability is 2.5. The soil has a CBR of 9. The overall standard deviation is 0.40 and the reliability is 95%. The pavement is currently designed for 1800 equivalent 18-kip single-axle loads per day. If the number of 18-kip single-axle loads were to increase by 30%, by how many years would the pavement design life be reduced?arrow_forward
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