دراسة مرجعية إلداء الرصف الخرساني بالمطارات بمناطق االجواء الحارة في ليبيا

Abstract

Libya is characterized by a relatively moderate climate in the north and a desert climate
(hot and dry) in the south, where the desert climate areas are characterized by high temperatures and
low rainfall rates in addition to the large change in temperatures between night and day, and due to
the presence of many airports in these southern regions. It has aircraft parking areas and
maintenance areas. Therefore, many problems appeared in the concrete paving at the construction
joints in these areas, resulting in poor paving performance. This study aims to identify the causes
and mechanisms of damage to concrete paving in airports located in hot, dry areas in Libya and to
suggest treatment methods. And to know concrete paving and construction joints.
This study included a field and reference study of airports located in hot climate areas, namely
Ghadames, Sebha, airports, to identify all concrete pavements, construction joints between concrete
pavements and asphalt shoulders, and the transition zone between concrete pavements and asphalt
pavements, and to identify the prevailing and similar damages to concrete pavements at these
airports.
By analyzing the causes of damage, it became clear that most of them in concrete pavement are
directly or indirectly related to the movement of concrete slabs. It was found that the damages were
similar, namely the widening of the gaps between the concrete pavement and the asphalt shoulders,
their filling with sand, and the elevation of the asphalt pavement above the level of the concrete
pavement surface. The expansion joints widened by a distance of up to 5 cm and were filled with
sand, as at Sebha Airport, and some contraction joints widened by a distance of up to 10 cm and
were filled with sand, as a result of the thermal expansion of the concrete and the rise in
temperatures. It became clear that the gap between the concrete and asphalt pavement at the end of
the buried concrete slab widens during the shrinkage movement and is penetrated by sand. When
the concrete pavement expands, the asphalt pavement rises upwards as a result of the concrete
pavement pushing on it. The asphalt pavement collapses. Treatment methods were suggested using
a camera to prevent movement transfer between the concrete and asphalt pavement, as well as
paving a strip 1.5 to 2 meters wide with aggregate only, adjacent to the concrete pavement. Wide
expansion joints are treated by removing the entire slab and re-pouring it.
One of the conclusions of this study is that the failure of the designs did not take into account the
environmental conditions at Ghadames Airport, such as the large change in temperatures, which
caused excessive expansion and contraction, and thus an increase in the value of the coefficient of
expansion of the concrete. This repeated thermal movement caused the expansion of the joints.
When constructing concrete pavements in hot areas, it was recommended that the distance between
expansion joints should not exceed 30 metres, that the reinforcement mesh should be continuous