Problem
1. Briefly state the influence of maximum aggregate size (i.e., 19 mm vs. 38 mm) on the mixing water content and the cement content of a concrete mixture with a given water-cement ratio of 0.5.
2. Why is it important to control the aggregate gradation once the concrete mix design has been selected? How is this gradation control expressed in a specification?
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.