Precast Prestressed Hollowcore Planking
STRONGER... FASTER... BETTER!
Mack Industries is known for its reputation in precast concrete. For over 75 years, the Company has been leading the way with innovative precast concrete products. In 2004, Mack added prestressed hollowcore planking to its large product offering, making the move into both prestressed concrete and structural concrete for residential, commercial and industrial building construction. Put Mack's reputation for Quality and Service to work for you !
Prestressed concrete has been used for over 30 years in commercial and highway construction projects where concrete must span long distances between supporting structures. Precast, Prestressed Hollowcore Planking is used primarily as a floor, roof, mezzanine area or tilt-up wall panel in commercial, institutional and industrial buildings. It also has found widespread application in residential construction as maintenance-free porches, decks, wine cellars, safe rooms and garage floors where living space beneath the garage is desired. Able to clear-span over 40 feet using less than a foot of vertical height, the product is a better substitute over traditional steel building methods in many designs. Once delivered to the jobsite, the product is quickly set in place by employees using a crane and connected to a building's masonry or steel structure.
How It Works
Low-slump concrete is continuously placed on a 500-ft. long casting bed utilizing a slip-forming machine. The concrete is consolidated around high-tensile strength steel prestressing strands that have been tensioned to over 31,000 lbs. each. More strands placed in the product allows higher plank strengths and loading for a given span. The cores and keyways on the side are formed as the slip-forming machine moves down the casting bed. After forming, block-outs, weld plates and other embedded items may be added to the product.
After curing, the bed is detensioned; imparting additional compressive strength to the product from the release of the prestressing strands. The product is then cut to length and width per specifications, removed from the bed and allowed to cure to full strength prior to shipment. Once shipped to the jobsite, a crane lifts each piece into place. It is then connected to the building by welding when on steel or by grouted rebar connection in the case of masonry or concrete. All precast-to-precast joints are then grouted solid to provide a unitary structure. Often a thin, self-leveling compound or composite structural concrete topping is then applied.
The Mack Advantage
Mack is a Precast Prestressed Concrete Institute (PCI) certified producer-member; giving you the assurance the highest quality levels are attained.
Mack's use of recycled content can contribute up to 2 points toward the U.S. Green Building Councils' Leadership in Energy and Environmental Design (LEED) Green Building Rating SystemTM for certification in sustainable design. Superior design flexibility; allowing for curves, angles, cantilevered balconies, penetrations and large openings.