fast-setting cement

"We'll need about a cubic yard of fast-setting cement."

Fred Cohrs, Ideal Basic's executive vice president, said the company sells a fast-setting cement that cures in two to four hours with a strength of 3,000 to 4,000 pounds per square inch.

They perfected a traditional Spanish and Italian technique for light, center-less vaulting using layers of tiles in fast-setting cement set flat against the surface of the curve, rather than perpendicular to it.

The leak blew one large bubble, which burst when it was about six inches across, then a much smaller one, then it subsided as the fast-setting cement did its work, He watched it intently for several minutes, but there was no further sign of activity.