MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
5th Edition
ISBN: 9781305581159
Author: Nicholas J. Garber; Lester A. Hoel
Publisher: Cengage Learning US
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Question
Chapter 21, Problem 12P
To determine
The current PCR for the pavement section and the new IRI that will trigger the rehabilitation.
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An agency uses the following formula to determine pavement condition rating,
PCR = 99.3 5.51 (5.0-ROUGH) 1.59 LNALL 0.221 AVGOUT 0.0306 LONG
where we have the following.
ROUGH = roughness measured by present serviceability rating (PSR), scale of 0 to 5
LNALL = natural logarithm of alligator cracking, ft per mile
AVGOUT = outer wheel path rutting (all locations averaged), 0.01 inch
LONG = longitudinal cracking, ft per mile
TRAN = transverse cracking, number of cracks per mile
And, present serviceability rating is determined as the following.
PSR = 5e-0.0051118 IRI-0.0016027
A pavement section has the following distress data.
IRI = 106 in./mi
Alligator cracking
110 ft/mi
Average rutting =
0.20 in.
Longitudinal cracks = 130 ft/mi
Transverse cracks = 12/mi
Determine the current PCR for this section.
PCR =
0.531 TRAN,
Now, assume a new roughness measurement is expected soon. When PCR falls below 60, the section will be scheduled for rehabilitation. Determine the new IRI value (in in./mi)…
As a materials engineer working for a
highway department, what standard PG
asphalt binder grade would you specify for
each of the conditions show in the table.
Seven-Day
Мaximum
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
39
1
-32
3.5
54
1.5
-17
2
69
2.5
1.
What standard PG asphalt binder grade should be selected under the following conditions:a. The seven-day maximum pavement temperature has a mean of 62°C and a minimum pavement temperature of -15°C. (table9.2)
b. According to part a, what is your recommendation for 20 million ESALs and 50 km/h speed? (table ESALs)
c. For 50 million ESALs and 80 km/h speed. (table ESALs)
Chapter 21 Solutions
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
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