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

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Corinu Procedure: A metal detector was used to locate the
designated test dowel at the test joint. Partial depth core
holes, centered over the ends of the dowel, were then drilled
down to the depth of the dowel. The concrete core was then
snapped off at the depth of the dowel, exposing the upper portion
of the ends of the dowel bar for location measurements.
Measurements Collected for Test Dowels: The following
measurements were collected for each end of each test dowel.
Vertical oosition: The distance from the top of the dowel
end to the pavement surface was measured directly with a
tape measure, either from the core or the core hole. These
measurements were used to determine the average depth and
vert?cal rotation of the dowels.
Lateral mosition: The distance from the center of the dowel
end to the shoulder edge of the lane was measured using the
following procedure. A two-foot carpenter's level was
fitted with a custom-built tripod with leveling screws. A
small black mark was made at the center of the dowel end.
To project a vertical line above the dowel center, the level
was plumbed vertically and the edge of the level was sited
in to line up with the mark on the dowel. An eight-foot
straightedge was laid longiza5inally at the shoulder edge of
the pavement. A tape measure 7;as stretched transversely
along the pavement surface from the siting edge of the level
to the straightedge at the shoulder, and the resulting
measurement was defined as the lateral position. These
measurements were used to determine the horizontal rotation
of the dowels.
Lonaitudinal oosition: The distance from the end of the
dowel to the sawn joint was measured using the following
procedure. To project a vertical line above the end of the
dowel, the same mounted carpenter's level was plumbed and
sited in to line up with the end of the dowel. A tape
measure was laid on the pavement surface directly over and
parallel to the dowel from the siting edge of the level to
the center of the sawn joint. The resulting measurement was
defined as the longitudinal position. These measurements
were used to determine the longitudinal offset from the
center of the dowel to the sawn joint.
Dowel Placement Parameters Evaluated: The four dowel placement
parameters evaluated in this study are defined below.
Note that lateral spacing of the dowels was not evaluated in this
study, because consecutive dowels across a single joint were not
cored. Lateral spacing is not an especially sensitive parameter,
and previous WisDOT coring on basket projects and the CTL report
on the Janesville inserter project both showed no problem with
meeting the contract specification -(12" plus or minus 1") for
lateral spacing.
3.5.9