chapter 3 rigid pavement - DOT On-Line Publications - Department ...

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CM. Edge of Wheel to Edge of Pavement
FIGURE 5 (mcnesj
Since the extended KC pavement siabs had little effect on the lateral wheel
path of the trucks, it suggests that the pavement edge stripe has a major effect on the
traffic distribution. However, opinions on this point differ among maintenance,
traffic, design, and construction engineers. If the pavement edge stripe is located
more than 12 ft (3.7 ml from the centerfine and on an AC shoulder, where will the
SW&S wheel paths be located ? Will they be 20 in (SOS mm) away from ;he edge of
the KC slab or 20 in (508 mm) away from the edge stripe itseif? It is a question :ha:
deserves much more thought by highway agencies.
ANALYSTS OF DATA ON PCC PAVEMEM- DETERIORATION
Extended PCC pavement skbs refers to KC slabs which are built wider than
the conventional 12-ft (3.7 m> striped traffic lane. The normal siab extension that has
typically been constructed varies from 1 to 3 ft (0.3 to 0.9 m). The basic concept
behind the construction of extended slabs is to kee? the heavy wheel loads away
from the outside edge of the pavement so that traffic loads used in design can be
considered interior loads. ‘?ruck wheel loads placed at the outside pavement edge
create more severe conditions than any other load position. Xs the truck piacement
moves inward a few inches from the edge, the effects decrease substantially.““’
Extended KC pavement siabs are not, however, a replacement for an adequate
shoulder pavement stmcture. in extended KC pavement slab should be used with
an adequate shoulder structure to meet an agency’s own design standards.
3.8.15