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Section 7: Damage from Super Heavy Load Moves

The five typical damages related to super heavy load moves are given as follows:

  1. Shearing of the pavement surface during turning movements ( Figure 12-4). The figure shows the need to consider road geometry in the super heavy load route evaluation. This damage can be prevented by using trailers with steerable axles. If the mover does not have this equipment, then the engineer can ask that the mover protect the surface at the turn by placing plywood sheets on the surface or laminated mats.
  2. Rutting or cracking due to overload of the pavement structure. Recent rainfall or poor drainage conditions resulting in weak or wet subgrade or base materials are often associated with structural damage of this type ( Figure 12-5). The figure also shows the need to consider road geometry. The road is narrow, and the outside tires are tracking on the unsurfaced shoulder. Moving of super heavy loads should be avoided on such roads. If there is no other route available, the engineer can have the mover mat the width of road where this trailer is going to track.
  3. Peeling of fresh seal coats or asphalt concrete pavement overlays ( Figure 12-6 and Figure 12-7). Moves should be avoided on fresh seal coats. If there is no other alternative, the mover can protect the surface by placing plywood sheets.
  4. Bleeding of seal coats or asphalt concrete surfaces ( Figure 12-8).
  5. Lateral shear failure at the pavement edge ( Figure 12-9 and Figure 12-10).

    Shearing of the pavement surface during
turning movements. (click in image to see full-size image) Anchor: #i1000229grtop

    Figure 12-4. Shearing of the pavement surface during turning movements.

    Rutting or cracking due to overload of
the pavement structure. Recent rainfall or poor drainage conditions
resulting in weak or wet subgrade or base materials are often associated
with structural damage of this type. (click in image to see full-size image) Anchor: #i1000231grtop

    Figure 12-5. Rutting or cracking due to overload of the pavement structure. Recent rainfall or poor drainage conditions resulting in weak or wet subgrade or base materials are often associated with structural damage of this type.

    Peeling of fresh seal coats (1st photo). (click in image to see full-size image) Anchor: #i1000233grtop

    Figure 12-6. Peeling of fresh seal coats (1st photo).

     Peeling of fresh seal coats (2nd photo). (click in image to see full-size image) Anchor: #i1000235grtop

    Figure 12-7. Peeling of fresh seal coats (2nd photo).

    Bleeding of seal coats. (click in image to see full-size image) Anchor: #i1000237grtop

    Figure 12-8. Bleeding of seal coats.

    Lateral shear failure at the pavement edge
(1st photo). (click in image to see full-size image) Anchor: #i1000241grtop

    Figure 12-9. Lateral shear failure at the pavement edge (1st photo).

    Lateral shear failure at the pavement edge
(2nd photo). (click in image to see full-size image) Anchor: #i1000243grtop

    Figure 12-10. Lateral shear failure at the pavement edge (2nd photo).


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