Problem
Determine the SSD mix proportions of concrete required for an outdoor pavement subject to frequent freeze-thaw cycles. The following data are given:
Specified 28-day compressive strength: 20 MPa
Slump: 75 mm
Coarse aggregate: 25 mm max. size; dry-rodded weight vol. per unit volume of concrete = 0.71
Fine aggregate: 2.8 fineness modulus
Specific gravities of cement, coarse aggregate, and fine aggregate: 3.15, 2.72, and 2.70, respectively.
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.