Products 04/06/2011 Way Down In The Hole: Drill Rig The Sandvik DI550 is a down-the-hole hammer drill rig that features a 434-hp diesel engine and a 24.4-m³ compressor with airflow at 24 bar. It is designed to work with Sandvik’s 3-in. to 5-in. RH550 hammers. The rig features a built-in dust collector with persistent cleaning to reduce overall dust emissions. Sandvik Mining and Construction; www.sandvik.com Concrete Testing: Portable Field Unit Resipod is a non-destructive, portable device for checking the electrical resistivity of concrete. It meets AASHTO’s TP9511 standard on concrete surface resistivity. Proceq; 800-839-7016; www.proceq.com Concrete Bonding: Hot Melt System
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.