This document summarizes two research papers on pavement failure. The first paper examines four cases of premature failure of asphalt overlays due to stripping. Stripping is a loss of bond between aggregates and asphalt binder. The researchers found similarities in the failures including mud stains, flushing, and potholes in wheel tracks. They concluded that moisture can cause stripping and recommended permeable base courses and inspecting existing pavements. The second paper examines causes of cracks and deterioration in Jordanian highways from contractors' perspectives. Contractors identified poor construction quality, inappropriate pavement dimensions, high traffic loads, substandard drainage and materials, and inadequate supervision and testing as leading causes. The study aims to minimize failure and reduce repair

1. Assignment: PavementFailure
Transportation Engineering-II.
Submitted to:Engr.MehwishSiddiqui Written by: Ahmed
Zakaria
670-2013
BS CV-7th sem.
S.no
Title Author Year Place of Publication Summary of Findings
01
PREMATURE
FAILURE OF
ASPHALT
OVERLAYS FROM
STRIPPING: CASE
HISTORIES
Prithvi S. Kandhal
&
Ian J. Rickards
April
2001
Paper presented at
the annual meeting
of the Association
of Asphalt Paving
Technologists held
in Clear Water,
Florida
The research was conducted on the
asphalt pavement stripping which
is a loss of bond between
aggregates and asphalt binder that
typically begins at the bottom of
the HMA layer and progress
upward.
The writers have emphasized that
during late 70s this issue was
increased in U.S which may be due
to the crude oil change or using of
drum mixers in asphalt plant.
In this regard the writers have
studied four projects in which
stripping took place just after 3 or
6 years of project completion.
The similarities they found in
pavement failure in all four
projects were appearingof Mud
stains, Flushing and Potholes on
wheel tracks where the pressure
applies mostly and due to presence
of moisture the pavement damages
early.
The writers have concludedthat:
Absence of moisture can prevent
stripping.
Due to poor drainage moisture
vapors occur and move upwards
due to capillary action and
saturated the soil.
If saturation exist under the
layer, then stripping is likely to
occur.
They recommended that:
An asphalt treated permeable
material base course at the
bottom of asphalt pavement.
The pavement design engineer
to inspect the already existing
pavements.
To develop lab test method to
predict moisture presence.

2. Assignment: PavementFailure
Transportation Engineering-II.
Submitted to:Engr.MehwishSiddiqui Written by: Ahmed
Zakaria
670-2013
BS CV-7th sem.
References:
http://profemery.info/kandhal_rickards.pdf
http://pakacademicsearch.com/pdf-files/eng/453/16-26%20Vol%203,%20No%2010%20(2013).pdf
S.no
Title Author Year Place of
Publication
Summary of Findings
01
CAUSES OF
CRACKS AND
DETERIORATION
OF PAVEMENT
ON HIGHWAYS IN
JORDAN FROM
CONTRACTORS’
PERSPECTIVE
Dr. Sultan
Tarawneh
&
Dr.
Mohammad
Sarireh
October
2013
The
International
Institute for
Science,
Technology and
Education
(IISTE)
www.iiste.org
The research is done on the causes of
pavement failure on highways of Jordan
in contractor’s point of view.
In this research the writer has designed
a questionnaire after a literature review
of scholarlypapers, international
articles on pavement failure and after
interviewingseniors field contractors
and directed that to contractors in road
constructions to fill the questionnaire
so that conclude their perspective about
deterioration in pavement of Jordan
highway’s.
The writers have emphasized on the
point that developingcountries like
Jordan has spent millions on
infrastructure and due to poor design
of road and traffic we face deterioration
on pavement which causes to spent
extra other millions to repair them.
This study focuses on to minimize the
pavement failure risk to save budget.
The study concluded that the reason
behind these crack and deterioration on
pavement are:
Poor construction quality.
Pavement Width
High traffic axial load and volume
Drainage systems and aggregate
quality are sub standards.
Poor supervision and quality tests
during construction
Road alignment and thickness of
surface and sub base are
inappropriate w.r.t to the highway