Civil Engineering Reference
In-Depth Information
Table 9-15 illustrates the change in mix proportions
for various types of concrete mixtures using a particular
aggregate source. Information for concrete mixtures using
particular ingredients can be plotted in several ways to
illustrate the relationship between ingredients and prop-
erties. This is especially useful when optimizing concrete
mixtures for best economy or to adjust to specification or
material changes (Fig. 9-9).
Water content, lb/yd
3
240
260
280
300
320
340
360
380
1000
550
900
500
800
450
700
400
600
350
300
500
250
400
200
300
150
Nominal maximum aggregate size, mm (in.)
175
7
6
150
125
5
100
4
75
3
50
2
25
1
Air-entrained concrete
0
0
150
160
170
180
190
200
210
220
230
Water content, kg/m
3
Fig. 9-9. Example graphical relationship for a particular aggregate source demonstrating the
relationship between slump, aggregate size, water to cement ratio, and cement content (
Hover 1995
).
