Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Chapter 20, Problem 26P
To determine
Themain criteriasthat are used for evaluating a trial
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2- Describe six of the main differences between rigid and flexible pavements.
The highest CBR number is required for
A.
Pavement
B. O
Subgrade
C. O
Subbase
D.
Base
Seven-Day
Maximum
Minimum Pavement
Recommended PG Grade
Pavement
Temperature, °c
Temperature, °c
Case
50%
98%
Mean, °C
Std. Dev., °C
Mean, °C
Std. Dev., °C
Reliability
Reliability
1
39
1
-32
3.5
2
54
1.5
-17
Chapter 20 Solutions
Traffic and Highway Engineering - With Mindtap
Ch. 20 - Portland cement concrete consists of what four...Ch. 20 - List and briefly describe the five main types of...Ch. 20 - What is the main requirement for the water used in...Ch. 20 - Prob. 4PCh. 20 - Prob. 5PCh. 20 - Prob. 6PCh. 20 - Prob. 7PCh. 20 - Prob. 8PCh. 20 - Prob. 9PCh. 20 - Prob. 10P
Ch. 20 - Prob. 11PCh. 20 - Prob. 12PCh. 20 - Repeat Problem 20-12, with the slab containing...Ch. 20 - Prob. 14PCh. 20 - Prob. 15PCh. 20 - Prob. 16PCh. 20 - Prob. 17PCh. 20 - Prob. 18PCh. 20 - An existing rural 4-lane highway is to be replaced...Ch. 20 - Prob. 20PCh. 20 - Prob. 21PCh. 20 - Prob. 22PCh. 20 - Prob. 23PCh. 20 - Prob. 24PCh. 20 - Prob. 25PCh. 20 - Prob. 26PCh. 20 - Prob. 27P
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- 3. The AASHTO present serviceability index (PSI) correlates the PSR to actual pavement performance in terms of applied traffic, and select distresses.a. Trueb. Falsearrow_forwardWhat will be the proper pavement to use when the traffic loads consist of heavy trucks or wheeler trucks?arrow_forwardQ#3. Discuss root causes and remedial measures of the following distresses occurring in flexible pavements: Slippage failure, Potholes, Rutting and its types, Bitumen bleedingarrow_forward
- Draw the cross section of a typical pavement with its recommended dimensions.arrow_forwardSeven-Day Maximum Pavement Minimum Pavement Temperature, °c Temperature, °c Recommended PG Grade 50% 98% Case Mean, °C Std. Dev., °C Mean, °C Std. Dev., °C Reliability Reliability 1 43 1.5 -29 2.5 2 51 3 -18 4 3 62 2.5 10 2arrow_forwardA 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.arrow_forward
- Explain the pavement using the mechanistic empirical method?arrow_forwardHow 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, etcarrow_forwardPavement Design and Analysis - Design a HMA pavement structure for a 6-lane divided urban highway using the AASHTO method to accommodate the traffic loads and conditions as follows. Give two alternative layer thickness combinations.arrow_forward
- 1- What are the two main criteria of pavement failure in mechanistic-experimental design approach? Explain the type and location of applied stresses.arrow_forwardRepeat 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?arrow_forwardFor 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.arrow_forward
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