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Road pavement distress case study

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Ameera K

on 18 June 2014

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Transcript of Road pavement distress case study

Table of content
General idea of pavement structural
Major causes of pavement distress
The pavement distress case study
Location of the road
Distresses at First segment, Second and third
Causes and repair techniques
Maintenance plans internationally
Maintenance plans from the Municipality of Abu Dhabi
Safety and traffic control
Compare and contrast with Korea

General idea of pavement structural
A pavement is thick compensation of layers in the road which is designed to the need of the road depending on:
Traffic loads
condition of the area
The surrounding weather condition

Types of pavements
Flexible
rigid

Types of pavement failure:
functional
Structural
Major causes of pavement distress
Traffic and loading
Wheel loading
Environmental factors
Temperature
Construction quality and material characterization
Compaction, Moisture content
Inadequate design
Sub-grade
Lack of maintenance
When and how maintenance preformed
Pavement distress case study
Aim of the case study: to be able to identify between different types of pavement distresses.
A local road in Abu Dhabi ( Khalifa city ) was selected length of 300 meters
The Location of the road
Pavement distress study
The main reasons behind selecting this area:
1- The level of water table (high)
2- Traffic loads
3- Drainage and sewage
4- The soil type
5- The presence of salts

Major reason: Municipality provided a temporary roads
Distresses at First segment
Distresses at First segment
Causes of patching:
used to repair defects in a pavement
Types of repair techniques:
• Partial Depth (patching less than 4 inches thick and contained within the asphalt surface)

• Deep Patching (“dig outs” at least 4 inches thick, and removal of additional material beneath the asphalt surfacing).

Prevention of distresses is better than maintenance
Road pavement distress case study
Course: Road design & Construction
Name: Ameera Mohamed
Instructor: Ali Badi


First segment from CH0 to CH100m
Patching distress
Cross section of 7m2
The severity level of the distress considered to be Low because patch is in good condition and satisfactory. Ride quality is affected minimally
Transverse Cracking was found at the edges of the patching.
Te severity level of the distress: Low because Average crack width is less than 6mm (1/4 inch) with no raveling or distortion along crack edges.

Distresses at First segment
Distress at first segment
Causes of Transverse cracking
Reflective crack caused by cracks beneath the surface layer
Shrinkage crack (due to low temperature or bitumen hardening) in an asphalt surface
The structural failure of a concrete base course

Repair strategies for Transverse cracking:
Typically sealed
Overlaid with adequate thickness of HMA to resist reflective cracking


Distress at first segment
Longitudinal cracking with 7 meter long
The severity level of the distress is: Medium because Crack opened to a width between 6mm and 25mm (1/4 and 1 inch)


Distress at first segment
Causes of Longitudinal distress
• he reflection of a crack or joint in the road pavement,
• poorly constructed joints in the asphalt surface
• asphalt hardening
• Temperature fluctuations.

Repair strategies for longitudinal cracking:
• During early stages, by sealing
• Overlay when it is extensive


Distress at second segment
The second segment starts from ch.100 to ch.200m

Edge cracking was found with a length of 3 meters.
The severity level of the distress is Medium because Crack opened to a width between 6mm and 25mm (1/4 and 1 inch)
Occasional because Cracking occurs along less than 20% of the pavement edge within the section.



Distress at second segment
Possible causes of Edge cracking
Lack of lateral support
Settlement of underlying material
Weak base or sub-grade layer
Poor drainage
Frost heave
Heavy traffic or vegetation along edge
Repair plans:
Crack sealing
Re-construction





A small pothole distress with a depth of 10.5mm and a middle length of 0.18m.
The severity level of the distress is low because D-bonded area is less than 0.8m2 and the depth of the De-bonded area is less than 25mm



Distress at second segment
Possible causes of Pothole cracking
Alligator cracking
dislodge of binder between layers
Repair plans:
Patching
Re-construct

Another Transverse cracking was found.
The severity level of the distress is Low
because Average crack width is less than 6mm



Distress at second segment
Distress at second segment
An alligator cracking was found
The severity level of the distress is Medium because The cracks developed into a pattern or network of cracks that may be lightly open.



Causes of Alligator cracking:
Too heavy loads
More load than provided for in design.
Repetitive passes with overweight trucks
Inadequate pavement thickness due to improper design or poor quality control during construction

Repair strategies for fatigue cracking:
Overlay
Removal and Replacement
Place a thick overlay over the area that is fatigue cracked




Distress at second segment
Distress at Third segment
From CH200 to CH300
Medium edge cracking
because crack width greater than 6mm



• Low Longitudinal cracking
because crack width less than 6mm with



• Medium alligator cracking
because the cracks developed into a pattern which are lightly open




Maintenance techniques Internationally and locally
Internationally:
The general maintenance techniques are provided in Appendix D which was provided from the municipality of Abu Dhabi

Locally :
The Municipality of Abu Dhabi is managing the internal roads in the Emirate of Abu Dhabi
Roads area selected for maintenance upon priority

Procedure of maintenance
A survey is done
A contract is made
variation of work orders

Asphalt Milling machine For the minor distresses
Core Cutter Machine For sever distresses


Maintenance plans for minor distresses
Asphalt Milling machine
Removal of at least 5cm of the surface
Ironing or pressing
pressing of the pavement layers with a hot gas
to melt the
bitumen and join the cracks
Seal with grouting



Maintenance plans for sever distresses
Core Cutter Machine For sever distresses


Locally maintenance methods
Locally maintenance methods
Other maintenance methods:
Crack sealing
Patching
regular maintenance
Drainage maintenance
Reclamation or stabilization


Compare and contrast with Korea
Major distresses in Korea
Rutting before 10 years ago
These days, cracks are the major

Pavement manage System


Routine maintenance
Patching, sealing of surface cracks
Repair of concrete pavement joints
Repair of paving blocks and slabs
Cleaning and maintaining tunnels, bridges, culverts

Periodic Maintenance
Pavement strengthening, overlays and recycling
Mill and pave, resurfacing
Repair and replacement of damaged/missing road furniture and signboards




Maintenance plans in Korea
Safety and traffic control
Construction signs and flags
Construction cones
Construction sign-boards
Safety training of team
Appropriate safety vests

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