360R-22 ACI COMMITTEE REPORT
Fig. 5.2—Typical isolation joints at tube columns.
Fig. 5.3—Alternate (pinwheel) isolation joint and suggested
concrete fill at wide flange columns.
Fig. 5.4—Typical isolation joint around equipment foundation.
material should extend the full
depth of the slab and not
protrude above it. Where the joint filler will be objectionably
visible, or where there are wet conditions or hygienic or dust-
control
requirements, the top of the preformed filler can be
removed and the joint caulked with an elastomeric sealant.
Two methods of producing a relatively uniform depth of
joint sealant are as follows:
1. Score both sides of the preformed
filler at the depth to
be removed using a saw. Insert the scored filler in the proper
location and remove the top section after the concrete
hardens by using a screwdriver or similar tool.
2. Cut a strip of wood equal to the
desired depth of the joint
sealant. Nail the wood strip to the preformed filler and install
the assembly in the proper location. Remove the wood strip
after the concrete has hardened.
Alternatively, a premolded joint filler with a removable
top portion can be used. Refer to Fig. 5.2 and 5.3
for typical
isolation joints around columns. Figure 5.4 shows an isolation
joint at an equipment foundation.
Isolation joints for slabs using shrinkage-compensating
concrete should be treated as recommended in ACI 223.
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