Lesson 5/Learning Event 1
In the example shown below, it is assumed that the aggregate blend is:
Coarse Aggregate
-
53 percent
Fine Aggregate
-
42 percent
Mineral Filler
-
5 percent
The OAC was determined as 4.7 percent of the total mix weight. Thus, to determine the
percentages of each size aggregate of the total mix weight, it is necessary to multiply each of the
given percentages by 95.3 percent (100% - 4.7%; total percent of aggregate by weight in the
mix) as follows:
The job-mix formula then is: CA 50.5%, FA 40.0%, MF 4.8%, and AC 4.7%.
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