Sufficient time shall be allowed between grout lifts to preclude
displacement or cracking of face shells of masonry units. If blowouts,
flowouts, misalignment, or cracking of face shells should occur during
construction, the wall shall be torn down and rebuilt.
3.9.1
Vertical Grout Barriers for Fully Grouted Walls
Grout barriers shall be provided not more than 10 m 30 feet apart, or as
required, to limit the horizontal flow of grout for each pour.
3.9.2
Horizontal Grout Barriers
Grout barriers shall be embedded in mortar below cells of hollow units
receiving grout.
3.9.3
Grout Holes and Cleanouts
3.9.3.1
Grout Holes
Grouting holes shall be provided in slabs, spandrel beams, and other
in-place overhead construction. Holes shall be located over vertical
reinforcing bars or as required to facilitate grout fill in bond beams.
Additional openings spaced not more than 400 mm 16 inches on centers shall
be provided where grouting of all hollow unit masonry is indicated.
Openings shall not be less than 100 mm 4 inches in diameter or 75 by 100 mm
3 by 4 inches in horizontal dimensions. Upon completion of grouting
operations, grouting holes shall be plugged and finished to match
surrounding surfaces.
3.9.3.2
Cleanouts for Hollow Unit Masonry Construction
Cleanout holes shall be provided at the bottom of every pour in cores
containing vertical reinforcement when the height of the grout pour exceeds
1.5 m 5 feet. Where all cells are to be grouted, cleanout courses shall be
constructed using bond beam units in an inverted position to permit
cleaning of all cells. Cleanout holes shall be provided at a maximum
spacing of 800 mm 32 inches where all cells are to be filled with grout. A
new series of cleanouts shall be established if grouting operations are
stopped for more than 4 hours. Cleanouts shall not be less than 75 by 100
mm 3 by 4 inch openings cut from one face shell. Manufacturer's standard
cutout units may be used at the Contractor's option. Cleanout holes shall
not be closed until masonry work, reinforcement, and final cleaning of the
grout spaces have been completed and inspected. For walls which will be
exposed to view, cleanout holes shall be closed in an approved manner to
match surrounding masonry.
3.9.3.3
Cleanouts for Solid Unit Masonry Construction
Cleanouts for construction of walls consisting of a grout filled cavity
between solid masonry wythes shall be provided at the bottom of every pour
by omitting every other masonry unit from one wythe. A new series of
cleanouts shall be established if grouting operations are stopped for more
than 4 hours. Cleanout holes shall not be plugged until masonry work,
reinforcement, and final cleaning of the grout spaces have been completed
and inspected. For walls which will be exposed to view, cleanout holes
shall be closed in an approved manner to match surrounding masonry.
SECTION 04200
Page 51
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