ITEM 510 DOWEL HOLES
510.01
Description
510.02
Materials
510.03 Drilling
of Holes
510.04
Placement
510.05 Curing
and Loading
510.06 Basis of
Payment
510.01 Description. This work consists of
drilling holes into concrete or masonry, and furnishing and placing grout into
the holes. The furnishing and placing of steel for dowels is included in
Item 509.
510.02 Materials. Cement grout
consists of one part of hydraulic cement conforming to Item 701 and three parts sand conforming to 703.03, by volume, and water.
Furnish
nonshrink, nonmetallic grout conforming to 705.20.
510.03 Drilling of Holes. Drill
holes at the location and the depth shown on the plans without spalling the concrete.
Drill
holes for cement grout at least 1/2 inch (13 mm) larger in diameter than the
dowel bar. Drill holes diameters for nonshrink,
nonmetallic grout at least 1/16 inch (1.5 mm) larger in diameter than the dowel
bar. Drill hole for encapsulated type nonshrink,
nonmetallic grout as recommended by the manufacturer.
Instead
of drilling holes, the Contractor may install formed holes with laitance
removed.
510.04 Placement. Do not install grout if the
temperature of the concrete into which the grout is being placed is below 40 °F
(4 °C). Force dowel bars into the holes, to the specified depth,
spreading the grout around the bar and solidly filling the hole.
Before
installing cement grout and dowels, saturate cement grout dowel holes with
water then blow out all excess water. Place enough cement grout to
completely fill the holes during dowel installation. If cement grout does
not completely fill the hole, remove the dowel, pour additional grout into the
hole, and reinstall the dowel.
Before
installing nonshrink, nonmetallic grout and dowel, clean
and dry the grout holes. Immediately after mixing, place a sufficient
amount of nonshrink, nonmetallic grout to provide
complete coverage around the dowel to ensure anchorage. If nonshrink, nonmetallic grout does not completely fill the
hole, pour additional grout in until the hole is filled flush.
Obtain
the correct protrusion of the anchors or dowels, and hold dowels in the plan
position within the holes until the grout has initially hardened.
If
horizontal holes are specified, provide a means of retaining the grout in the
hole flush with the vertical face and remove this material after the grout has
hardened. Do not use material for retaining the grout that bonds to the
grout.
510.05 Curing and Loading Before
applying any stresses to dowels, cure nonshrink,
nonmetallic grout as follows:
Daily Minimum Ambient Temperature |
Minimum Curing Time |
33 to 50 °F (1 to 10 °C) |
3 hours |
51 to 68 °F (11 to 20 °C) |
1 1/2 hours |
above 68 °F (above 20 °C) |
1 hour |
510.06 Basis of Payment. The Department
will pay for accepted quantities at the contract prices as follows:
Item
Unit
Description
510
Each
Dowel holes with cement grout
510
Each
Dowel holes with nonshrink, nonmetallic
grout