Civil Engineering Reference
In-Depth Information
9
Poles should be inspected upon receipt by the Purchaser, immediately
after construction, and periodically during the life of the structure.
Prestressed concrete poles, when properly installed, require little or no
maintenance. However, the prestressed concrete poles should be inspected
periodically under the terms of agreements or warranties, as required, to
ensure that there are no points of deterioration in the product. Isolated
damage may occur as a result of storms, high winds, impact damage by
vehicles, equipment and fl ying debris, vandalism, and a host of other
reasons. Although the ultimate life of prestressed concrete poles may vary,
existing research suggests a 50- to 100-year life is reasonable depending
on some key factors, such as the environment, materials, design, and
manufacturing methods.
Pole Surface
The surface of the prestressed concrete pole should appear smooth and
uniform. Variations in color and hue are common. Over time the surface
appearance may change. Age, environment, and raw materials used in
manufacturing the pole all contribute to these changes. Surface appear-
ances and changes in appearance over time are normally acceptable.
Small surface shrinkage cracks may exist. These cracks can appear on
small or large areas. They are close together, short in length, hairline or less
in width and usually have minimal depth. Typically the cause is associated
with a thermal transition during the life of the structures. These small
surface shrinkage cracks have no negative impact to structural integrity.
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