Said to be economical for spans between 24 and 34 feet, a patented composite floor system consists of hollow-core precast planks supported at the ends by composite beams. The planks are set on precast beam forms that are supported by scaffolding. Beams are then cast by filling the pocket between the ends of the planks with concrete.
Placing concrete for an addition to a water treatment plant in North Dakota was complicated by limited access to the construction site.
Strap on the backpack harness, turn on the air compressor, grip the handles, and slowly walk backward--this is all that is required to operate this aluminum vibratory screed. One worker who actually wears the screed can position and maneuver it.
The $4.6 million contract to rehabilitate a bridge on Interstate 190 near Grand Island, New York allowed 18 months for construction. Based on a visual inspection of the bridge, the contract called for the removal of 14,000 square feet of bridge deck. Deteriorated surface concrete was to be removed to a depth of at least 1 inch below the top reinforcing steel.
To select blades or bits for cutting concrete, a contractor doesn't need to know how they are made, but he should know how they will be used--the type of concrete he has to cut and the machine he plans to cut with. A manufacturer of concrete cutting equipment can then recommend a blade or bit that will match the concrete and the machine.