STRIPPING ON SAUDI ARABIAN ROADS –
PREDICTION AND PREVENTION
H.I. Al-Abdul Wahhab1, I.M. Asi1, S.A.
Ali2, S. Al-Swailmi3
and A. Al-Nour4
1: Professor and Assistant Professor, respectively,Civil Engineering
Dept, KFUPM, Dhahran 31261
2: Associate Professor, Chemistry Dept., KFUPM,
3: Director, Operations & Maintenance, Riyadh Municipality,
4: Engineer, M&R Dept., Ministry of
The 6th Saudi Engineering Conference, KFUPM,
Dhahran, December 2002 Vol. 3.
Pavement weathering or stripping is a major distress
in the highway network in the Kingdom
of Saudi Arabia.
Stripping severity varies between the regions of the Kingdom. The highway networks
of the Al-Qassim and Hail regions are the most
affected by pavement stripping in the Kingdom. Saudi roads, which are
experiencing stripping and weathering, have passed
locally used water sensitivity tests. In this study, which is funded by King Abdulaziz City
for Science and Technology (KACST), seventeen road test sections were selected,
out of which eight were stripped and nine were unstripped
sections. These sections were selected across the Kingdom to cover the
different stripping affected regions. Aggregates from quarries used to build
these sections were also collected for laboratory analysis evaluation.
Collected materials were subjected to detailed physical and chemical testing to
evaluate the ability of these tests to distinguish between stripped and
non-stripped sections. Out of these tests, modified Lottman
which has the highest significance and currently adopted as a result of SHRP
research, worldwide, in addition to Swedish Rolling Bottle which has the
ability to screen asphalt-aggregate materials for their stripping potential,
were selected. Eleven antistripping liquid additives,
lime, and cement in addition to two polymers were evaluated for their ability
to reduce/eliminate stripping potential of stripping-prone aggregates. It was
found that EE-2 Polymer and Portland cement and their combination were
effective with all aggregate sources.
Keywords: Stripping, ECS,
Polymer, Antistripping agents, Lottman