Q.: We read about roller-compacted concrete (RCC) being used for streets and roads. It's reported to cost less than asphalt pavements. What's the smallest size job that can be done economically?

A.: Ron Pelz of Pelz Construction Company in Alliance, Nebraska, says that he can bid competitively on some jobs requiring as few as 5,000 cubic yards of RCC. However, to get maximum savings for an RCC job, a volume of 20,000 cubic yards or more is best. You'd need about 5,000 cubic yards of RCC for a mile of pavement 40 feet wide and 8 inches thick.