Select one for each of the following:1. Tire pressure affects the:a) pavement thickness b) quality of surface course2. Tie bars in rigid pavements are at:a) expansion joints3. The fundamental factor in selection of pavement type isa) climatic condition b) type and intensity of traffic c) subgrade and drainage condition d) cost4. Present Serviceability Index (PSI) depends ona) slope variance5. Using subbase course in rigid pavement is for:a) resist unlimited loading b) more economical c) drainage purpose d) no reinforcement usedc) number of layersd) pavement typeb) contraction jointsc) warping jointsd) longitudinal jointsb) ruttingc) crackingd) all of them

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1. Tire pressure affects the: a) pavement thickness b) quality of surface course 2. Tie bars in rigid pavements are at: a) expansion 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 c) number of layers d) pavement type b) contraction joints c) warping joints d) longitudinal joints

1. Tire pressure affects the: a) pavement thickness b) quality of surface course 2. Tie bars in rigid pavements are at: a) expansion 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 c) number of layers d) pavement type b) contraction joints c) warping joints d) longitudinal joints

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 13P: Repeat Problem 19-7 using two different depths of untreated aggregate bases of 6 in. and 12 in....

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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,
highway engineering
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
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.
Mechanistic 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.
A rigid pavement is designed with a 10-inch slab,an Ec of 6 million lb/in^2, a concrete modulus of rupture of 432 lb/in^2, a load transfer coefficient of 3.0, an initial PSI of 4.7, and a terminal serviceability index of 2.5.The overall standard deviation is 0.35, the modulus of subgrade reaction is 190 lb/in^3, and a reliability of 90%is used along with a drainage coefficient of 0.8. The pavement is designed assuming traffic is composed entirely of trucks (100 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 structural number of 4 and is expected to last the same number of years as the rigid pavement. What is the assumed soil resilient modulus? (Assume all other factors are the same as for the rigid pavement.)
A pavement was designed to have 50 mm bituminous surface course, bituminous binder course 190 mm, 200 mm crushed aggregate road base, and 150 mm granular subbase. The designed was based on the number of ESALs for the base year is 1.4 million, design period is 20 years and average annual traffic growth factor is 4.5%. Using these data: Determine the Subgrade modulus design input value and Estimate the design traffic (ESAL DES).
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
B. A rigid pavement with a 10-inch slab thickness, 90 percent reliability, E. = 4 million lb/in², 600 lb/in² 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 lanes.
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