be limited to 1.2 m 4 feet in height. The first lift of grout shall be
placed to a uniform height within the pour section and vibrated thoroughly
to fill all voids. This first vibration shall follow immediately behind
the pouring of the grout using an approved mechanical vibrator. After a
waiting period sufficient to permit the grout to become plastic, but before
it has taken any set, the succeeding lift shall be poured and vibrated 300
to 450 mm 12 to 18 inches into the preceding lift. If the placing of the
succeeding lift is going to be delayed beyond the period of workability of
the preceding, each lift shall be reconsolidated by reworking with a second
vibrator as soon as the grout has taken its settlement shrinkage. The
waiting, pouring, and reconsolidation steps shall be repeated until the top
of the pour is reached. The top lift shall be reconsolidated after the
required waiting period. The high-lift grouting of any section of wall
between vertical grout barriers shall be completed to the top of a pour in
one working day unless a new series of cleanout holes is established and
the resulting horizontal construction joint cleaned. High-lift grout shall
be used subject to the limitations in Table III.
TABLE III
POUR HEIGHT AND TYPE OF GROUT FOR VARIOUS GROUT SPACE DIMENSIONS
Minimum Dimensions of the
Total Clear Areas Within Grout
Maximum
Spaces and Cells (mm) (1,2)
Grout Pour
Height
Grout
Grouting
Multiwythe
Hollow-unit
(m) (4)
Type
Procedure
Masonry (3)
Masonry
____________
_______
____________
___________
_____________
0.3
Fine
Low Lift
20
40
x
50
1.5
Fine
Low Lift
50
50
x
75
2.4
Fine
High Lift
50
50
x
75
3.6
Fine
High Lift
65
65
x
75
7.3
Fine
High Lift
75
75
x
75
0.3
Coarse
Low Lift
40
40
x
75
1.5
Coarse
Low Lift
50
65
x
75
2.4
Coarse
High Lift
50
75
x
75
3.6
Coarse
High Lift
65
75
x
75
7.3
Coarse
High Lift
75
75
x
100
TABLE III
POUR HEIGHT AND TYPE OF GROUT FOR VARIOUS GROUT SPACE DIMENSIONS
Minimum Dimensions of the
Total Clear Areas Within Grout
Maximum
Spaces and Cells (in.) (1,2)
Grout Pour
Height
Grout
Grouting
Multiwythe
Hollow-unit
(feet) (4)
Type
Procedure
Masonry (3)
Masonry
____________
_______
____________
___________
______________
1
Fine
Low Lift
3/4
1-1/2 x 2
5
Fine
Low Lift
2
2x3
8
Fine
High Lift
2
2x3
12
Fine
High Lift
2-1/2
2-1/2 x 3
24
Fine
High Lift
3
3x3
1
Coarse
Low Lift
1-1/2
1-1/2 x 3
SECTION 04200
Page 53
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