Photo courtesy Nitto Construction Co. In a departure from traditional rebound hammer designs, a test hammer developed by a Japanese construction firm has a built-in accelerometer to provide a baseline for its calculations. An electronic concrete test hammer, developed by a Japanese construction company looking to improve non-destructive testing tools, is now available in the U.S. market along with a stateside product representative.Nitto Construction Co. Ltd., Monbetsu-gun, Hokkaido, Japan, began to develop the hammer after concrete delaminated and fell in the Sanyo high-speed rail tunnel in 1999.The company was dissatisfied with testers based on the widely used rebound design developed
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.