Problem
1. Explain why the process of proportioning concrete mixtures is still in the realm of art. Have you any ideas on how to make the currently used practice in the United States more scientific?
2. You find yourself the project manager for a concrete structure involving several million cubic yards of concrete. Briefly, what tips would you like to pass on to the engineer in charge of mix proportioning on the subject of materials cost reduction? In your answer, emphasize the key ingredient in concrete from the standpoint of cost.
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.