Problem
1. After reviewing the ASTM C 618 and C 989 Standard Specifications and other published literature, write a critical note comparing the two standards.
2. What are the essential differences in composition and mode of action between the surfactants used for air entrainment and those used for water reduction?
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.