Section 17: Intersections and Irregular Shapes
Introduction
In general, intersections and irregular shapes should be seal
coated before the main lanes. This will minimize aggregate loss
due to turning movements from construction equipment and provide
a sharp longitudinal joint.
Transitions
Transitions are shot in a similar manner to shoulders. It
is good practice to start at the narrow end, whenever possible.
Then as the surface widens, one or two nozzles can be turned on
quickly at the right time. If progression is toward the narrow end,
there is more potential for overspray error. There are cases where
it is not practical to start at the narrow end.
In some cases, transitions may require some touch-up with
the hand sprayer in order to even up the outside edge. The inside
joint at the full lane should be straight and sharp. The outside
edges can be touched up easier than a ragged joint.
Radii at Intersections
To seal the radii at intersections, apply the asphalt with
the distributor hand sprayer and apply the aggregate with the spreader
or by hand.
Crossovers on Divided Highways
Sealing the crossovers on divided highways normally entails
a combination of techniques used for transitions and intersection
radii.
Driveways and Private Roads
Driveways and private roads, which provide access to the highway,
are not normally sealed even though they are within TxDOT’s right
of way.
Problems with Hand Work
Anytime that hand spraying and manual aggregate spreading
is required, achieving uniform application rates will be difficult.
It is desirable to keep hand work to a minimum. Any lack of uniformity
will usually result in some type of problem, either immediately
or in the future.