Civil Engineering Reference
In-Depth Information
Table 9-5 (Metric). Approximate Mixing Water and Target Air Content Requirements for Different Slumps and
Nominal Maximum Sizes of Aggregate
Water, kilograms per cubic meter of concrete, for indicated sizes of aggregate*
Slump, mm
9.5 mm
12.5 mm
19 mm
25 mm
37.5 mm
50 mm**
75 mm**
150 mm**
Non-air-entrained concrete
25 to 50
207
199
190
179
166
154
130
113
75 to 100
228
216
205
193
181
169
145
124
150 to 175
243
228
216
202
190
178
160
—
Approximate amount of
entrapped air in non-air-
3
2.5
2
1.5
1
0.5
0.3
0.2
entrained concrete, percent
Air-entrained concrete
25 to 50
181
175
168
160
150
142
122
107
75 to 100
202
193
184
175
165
157
133
119
150 to 175
216
205
197
184
174
166
154
—
Recommended average total
air content, percent, for level
of exposure:
†
Mild exposure
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
Moderate exposure
6.0
5.5
5.0
4.5
4.5
4.0
3.5
3.0
Severe exposure
7.5
7.0
6.0
6.0
5.5
5.0
4.5
4.0
* These quantities of mixing water are for use in computing cementitious material contents for trial batches. They are maximums for reason-
ably well-shaped angular coarse aggregates graded within limits of accepted specifications.
** The slump values for concrete containing aggregates larger than 37.5 mm are based on slump tests made after removal of particles larger
than 37.5 mm by wet screening.
† The air content in job specifications should be specified to be delivered within -1 to +2 percentage points of the table target value for mod-
erate and severe exposures.
Adapted from
ACI 211.1
and
ACI 318
.
Hover (1995)
presents this information in graphical form.
Table 9-5 (Inch-Pound Units). Approximate Mixing Water and Target Air Content Requirements for Different
Slumps and Nominal Maximum Sizes of Aggregate
Water, pounds per cubic yard of concrete, for indicated sizes of aggregate*
Slump, in.
3
⁄
8
in.
1
⁄
2
in.
3
⁄
4
in.
1 in.
1
1
⁄
2
in.
2 in.**
3 in.**
6 in.**
Non-air-entrained concrete
1 to 2
350
335
315
300
275
260
220
190
3 to 4
385
365
340
325
300
285
245
210
6 to 7
410
385
360
340
315
300
270
—
Approximate amount of
entrapped air in non-air-
3
2.5
2
1.5
1
0.5
0.3
0.2
entrained concrete, percent
Air-entrained concrete
1 to 2
305
295
280
270
250
240
205
180
3 to 4
340
325
305
295
275
265
225
200
6 to 7
365
345
325
310
290
280
260
—
Recommended average total
air content, percent, for level
of exposure:
†
Mild exposure
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
Moderate exposure
6.0
5.5
5.0
4.5
4.5
3.5
3.5
3.0
Severe exposure
7.5
7.0
6.0
6.0
5.5
5.0
4.5
4.0
* These quantities of mixing water are for use in computing cement factors for trial batches. They are maximums for reasonably well-shaped
angular coarse aggregates graded within limits of accepted specifications.
** The slump values for concrete containing aggregates larger than 1
1
⁄
2
in. are based on slump tests made after removal of particles larger than
1
1
⁄
2
in. by wet screening.
† The air content in job specifications should be specified to be delivered within -1 to +2 percentage points of the table target value for mod-
erate and severe exposures.
Adapted from
ACI 211.1
.
Hover (1995)
presents this information in graphical form.
