Question: 1. Briefly discuss the advantages and disadvantages of precast, prestressed concrete compared to cast-in-place concrete.
2. When placing parallel No.8 (metric No. 25) reinforcing bars in a column form, what minimum clear distance between bars should be obtained if the maximum concrete aggregate size is 2 in. (51 mm)?
3. Why should interior columns be isolated from floor slabs? How is this usually accomplished?