Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 21, Problem 6P
To determine
The DR (Distress Rating) for the given pavement rating method by using six distress types.
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a) As a pavement inspector, you are assigned to assess a pavement condition. Following
photographs were taken during a survey from 2 locations of the pavement.
Figure 1: Location 1
Figure 2: Location 2
Describe these distresses with possible causes and repair techniques.
Q:
Discuss various Design, Construction, and Supervision factors causing pavement failures?
Subject: Pavement Structure and design.
Program: MS in Transportation Engineering
Determine the base thickness of plain concrete pavement (PCP) without dowelled joints using the information and charts provided be
• Desired project reliability - 85%
Subgrade design CBR-6%
• Design period -30 years
• Design Traffic 5.0*10* HVAG(B)
Note: The information obtained from each table or figure must be stated in the examination script to obtain relevant marks.
Table 3.1: Minimum subbase requirements for rigid pavements
Design traffic (HVAG)
Subbase type
125 mm bound
Up to 10⁰
Up to 5x10
150 mm bound or 125 mm LCS
Up to 1x10
170 mm bound or 125 mm LCS
150 mm LCS
Greater than 1x 10
1 Under CRCP, a heavily bound subbase with an asphalt surfacing is an acceptable alternative
75
Maximum permitted value
CBR %
Effective subgrade
strength used in
concrete base
thickness
determinations
60
50
40
35
30
25
20
15
12
10
Concrete Base 200
Thickness 190
(mm)
180
8.
Pavement type
7.
6.
5.
PCP
Dowelled & CRCP
260
250
240
230
220
210
170
160
150
140
150mm LCS
125mm LCS
8 10
Design subgrade…
Chapter 21 Solutions
Traffic and Highway Engineering
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- Assume that the overall pavement evaluation of Interstate highways in a district consists of four categories: Surface distress index = 75, drainage index = 80, roughness index = 85, and structural index = 90. For all indices, 100 represents the best condition. Calculate the overall pavement index (OPI) of the interstate highways in this district, if the relative weights of different indices are 0.20, 0.25, 0.28, and 0.27, respectively.arrow_forwardQ9. The preventive rehabilitation technique is that which involves: a) surface applications of either structural or nonstructural improvements intended to keep the quality of the pavement above a predetermined level b) all means that enables the designer to consider each maintenance alternative in terms of a final product and then select the most appropriate one in terms of results desired and cost. c) the permanent or temporary repair of deficiencies on an as-needed basis d) a and b e) b and c Q10. When compacting a soil at wet to optimum, then; a) the soil fabric is oriented and it has lower permeability b) the soil fabric is dispersed and it has lower permeability c) the soil fabric is dispersed and it has a higher strength d) the soil fabric is dispersed and it has a lower strengtharrow_forwardDiscuss the process and major considerations on the application/installation of pavement markings.arrow_forward
- 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 − 0.531 TRAN, 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 = 108 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 = 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…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 bleeding Answer in word formatarrow_forwardDefine precisely the difference between pavement serviceability and performance. Using a sketch to indicate the concept of remaining service life of a pavement segment.arrow_forward
- The following are the results of pavement distress survey: Distresses identified are: Alligator cracks, patching, raveling and bleeding. The corresponding factors are: 2.4, 2.0, 2.1, 1.5, respectively. The weights are: 9, 6, 3, 3, respectively. Compute the distress rating. Blank 1 Blank 1 Add your answerarrow_forwardDefine pavement management system (PMS) and describe its benefits.arrow_forwardDescribe these five (5) types of pavement deformations (A-E) and then discuss the causes and propose the proper solutions of each type.arrow_forward
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