Berntsen offers the following styles of aluminum concrete survey markers for use in concrete or rock:
"C" style (US Army Corps of Engineers Type 1 Disc) concrete survey marker has the classic 3" (76mm) long split-style tapered stem. It is available in 3-1/2" (89mm) or 4" (102mm) diameters. Orbital formed from solid 6000 series aluminum bar.
For smaller concrete markers use the "CD" style 2" (50mm) diameter marker has a 3 /4" (19mm) diameter x 2" (50mm) long stem and is notched to hold firmly in concrete or rock. Orbital formed from solid 6000 series aluminum bar. It is also available as a leveling mark with a raised datum point (with recessed center) for precise monitoring (model CD2L).
The "RT" style concrete marker is a variation on the concrete disc theme and is available in a 3-1/2" (89mm) diameter. The RT1 offers more resistance to twisting and features four legs.
Orbital formed from solid 6000 series aluminum bar.
The CAPMAG ceramic magnet can be used with concrete markers to assure easy detection of the mark by a magnetic locator. Dimensions are 1/2" (13 mm) in diameter & 1/4" (6 mm) long. Can be located up to four feet deep with a magnetic locator.
For Aluminum Concrete marker installation instructions Click Here
In high purity form, aluminum is a soft and ductile metal. Aluminum of 99 percent or higher purity has many applications but has very low structural strength. Most commercial applications for aluminum require greater strength than can be achieved with high purity aluminum. Additional strength is achieved in aluminum by adding other elements to produce alloys. These elements, either alone, or in combination impart strength to the metal. Additional strengthening is also possible by means of heat treating techniques or other processes such as cold forging. (Cold forging provides only a moderate increase in strengthening high purity 1000 Series aluminum; 1000 Series aluminum is not heat-treatable). Commercially pure aluminum components can also function like anodes used to protect buried pipelines and sacrifice themselves to protect the (iron or steel) pipe.
Berntsen's Better Way
6000 Series Aluminum-Berntsen has always worked with strong corrosion resistant alloys such as those found in 6000 Series. Alloys in this group contain magnesium and silicon (which form magnesium silicide) and make the alloy heat-treatable. Alloys in the series can also gain considerable strength through cold working techniques such as orbital cold forming-a Berntsen exclusive in survey monument components since 1986. Several components of Berntsen survey monuments and markers such as caps, pipe and rods are manufactured from this versatile alloy series, and, depending on the intended use, may be
heat-treated for added strength.
Orbital formed survey caps from Berntsen are guaranteed to not crack, chip or break.