Problem
1. Describe the significance of workability of concrete and the factors affecting the property.
2. According to the ACI Building Code 318, selection of mix proportions should be based on the average strength, not the specified strength. Is this justified? Given a specified strength value, what procedures are used to determine the average strength?
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.