TM 5-822-11/AFP 88-6, Chap. 7
CHAPTER 4
JOINT AND CRACK PREPARATION
4-1. Equipment Used. All machines, tools,
width of the joint to ensure a uniform joint
and equipment used to complete a joint or crack
reservoir. The saw is used primarily for forming
sealing or resealing project must be inspected
new joints and refacing existing joints. Using the
before work is started. The inspector must make
saw to reface existing joints helps to provide a
these checks before the start of the project and
clean surface. When the saw is being used to
continue the inspections as work progresses to
prepare cracks, a small diameter diamond blade (6
ensure that the equipment is being maintained in
inch or less) as shown in figure 4-2 should be used
satisfactory condition at all times. Test sections
to follow closely the crack. This produces a
should be required to demonstrate the equipment's
sealant reservoir similar to those of a prepared
capability of performing the designated work with-
joint.
out damaging the pavement.
b. Joint Plow. The joint plow is a tractor
a. Concrete Saw. The concrete saw is usually a
mounted cutting tool, such as the one shown in
self-propelled, water-cooled power saw that uses
figure 4-3, used to remove old joint sealant from
diamond or abrasive saw blades to cut the pave-
joints in PCC. The cutting tool is pulled through
ment without damaging it. A typical saw is shown
the joint, removing the sealant from the joint
in figure 4-1. The blades must have rigid spacers
walls. The shape of the cutting tool is very
or "dummy" blades to separate the two cutting
important. The tool face must be rectangular and
blades or must have a solid blade of the specified
the tool's width should be close to but narrower
4-1
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