Q2: Select one for each of the following: 1. Tire pressure affects the: a) pavement thickness b) quality of surface course c) number of layers d) pavement type 2. Tie bars in rigid pavements are at: a) expansion joints b) contraction joints c) warping joints d) longitudinal joints 3. The fundamental factor in selection of pavement type is a) climatic condition b) type and intensity of traffic c) subgrade and drainage condition d) cost 4. Present Serviceability Index (PSI) depends on a) slope variance b) rutting c) cracking d) all of them 5. Using subbase course in rigid pavement is for: a) resist unlimited loading b) more economical c) drainage purpose d) no reinforcement used

Q2: Select one for each of the following: 1. Tire pressure affects the: a) pavement thickness b) quality of surface course c) number of layers d) pavement type 2. Tie bars in rigid pavements are at: a) expansion joints b) contraction joints c) warping joints d) longitudinal joints 3. The fundamental factor in selection of pavement type is a) climatic condition b) type and intensity of traffic c) subgrade and drainage condition d) cost 4. Present Serviceability Index (PSI) depends on a) slope variance b) rutting c) cracking d) all of them 5. Using subbase course in rigid pavement is for: a) resist unlimited loading b) more economical c) drainage purpose d) no reinforcement used

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 16P

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Similar questions

Problem 1: Make a diagram showing the comparison between Flexible and Rigid Pavement. Categorize the comparison based on the type and number of layers, materials used, design input data, suitability, durability etc. Note: For reference use AASHTO
4.13) A rigid pavement is being designed with the same parameters as used in Problem 4.5. The modulus of subgrade reaction is 300 1b/in? and the slab thickness is determined to be 8.5 inches. The load transfer coefficient is 3.0, the drainage coefficient is 1.0, and the modulus of elasticity is 4 million Ib/in?. What is the design modulus of rupture? (Assume that any parameters not given in this problem are the same as those given in Problem 4.5.) 4.5 has been added for reference.
A rigid pavement is being designed with the same parameters as used in Problem 4.5. The modulus of subgrade reaction is 300 lb/in? and the slab thickness is determined to be 8.5 inches. The load transfer coefficient is 3.0, the drainage coefficient is 1.0, and the modulus of elasticity is 4 million 1b/in?. What is the design modulus of rupture? (Assume that any parameters not given in this problem are the same as those given in Problem 4.5.) 4.5 for reference: A flexible pavement was designed for the following daily traffic with a 12-year design life: 1300 single axles at 8000 Ib each, 900 tandem axles at 15,000 1b each, 20 single axles at 40,000 Ib each, and200 tandem axles at 40,000 lb each. The highway was designed with 4 inches of HMA wearing surface,
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
A rigid pavement is designed with a 11-inch slab, an E_c of 6 million Ib/in^2, a concrete modulus of rupture of 432 Ib/in^2, a load transfer coefficient of 3.0, an initial PSI of 4.50, and a TSI of 2.5. The overall standard deviation is 0.56, the modulus of subgrade reaction is 190 Ib/in^3, and a reliability of 90% is used along with a drainage coefficient of 0.87. The pavement is designed assuming that traffic is composed entirely of trucks (50 per day). Each truck has one 20-kip single axle and one 42-kip tandem axle (the effect of all other vehicles is ignored). A section of this road is to be replaced (due to different subgrade characteristics) with a flexible pavement having a SN of 5 and is expected to last the same number of years as the rigid pavement. What is the assumed soil resilient modulus? (Assume that all other factors are the same as for the rigid pavement). Please report your answer as a decimal in units of Ib/in^2. For example, report 3000.6 Ib/in^2 as 3000.6.
4- Describe the characteristics and functions of the top layer in a pavement system.
Q, Discuss the following terms briefly: a, Emulsion breaking and Cutback curing, b, Water bound and aggregate base, c, Flexible pavement and Rigid pavements,
What are the critical pavement responses in flexible pavements that can be analyzed using structural models? What are the typical resilient (elastic) modulus values for fine-grained subgrade soil, coarse grained subgrade soil, granular base, cement stabilized base, PCC, AC (at different temperatures), etc.? How sensitive are the critical pavement responses to (a) increased tire pressure, (b) increased subgrade strength, (c) Poisson's ratio changes, (d) lime stabilization of top 6 in. of subgrade, (e) asphalt or cement stabilization of base layer, etc.?
Discuss various tests used for the quality of aggregate used in flexible pavements.
If 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 ?
Problem 32: What is the stiffness factor of a pavement if the modulus of elasticity is 180 MPa and whose subgrade modulus is 40 MPa?
50 KPa is equivalent to: O A) 5x 10^6 N/m^2 O B) 5 x 10^5 N/m^2 O0 5 x 10^3 N/m^2 O D) 5 x 10^4 N/m^2 Concrete is required for a plain concrete pavement to be constructed in Southern Alberta. The pavement will be exposed to freezing, thawing, and deicers. If aggregates with a nominal maximum size of 20 mm are used, what is the minimum cement content per cubic meter of concrete as per the CSA Standard? OA) 320 kg O B) 335 kg OO 390 kg OD) 420 kg During Lab 5, the relative density of a coarse aggregate sample was determined. The sample of coarse aggregate was towel dryed to represent this moisture state: O A) OD B) Wet OC SSD O D) Air Dry When performing the slump test, each layer of concrete is rodded times as per CSA specifications: OA) 20 O B) 25 OO 30 O D) 12