Problem
1. Discuss the factors that influence the compressive strength of concrete exposed to a fire of medium intensity (650oC, short-duration exposure). Compared to the compressive strength, how would the elastic modulus be affected, and why?
2. What is the effect of pure water on hydrated portland cement paste? With respect to carbonic acid attack on concrete, what is the significance of balancing CO2?
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.