Masonry Magazine October 1966 Page. 29
Use New Construction Technique
Architects, building engineers and developers are running counter to form as they drop by V-R Corporation's new Seventeenth Green apartment development in Hallandale, Florida. The big attraction is a new construction technique that is achieving such spectacular speed-ups and economies that men in the industry cannot maintain their customary aloofness from projects other than their own. John Arbib, developer, plays host daily to them as they gather from all parts of the country to watch load bearing concrete columns being gunned into place.
New "Gunned Columns" take form fast on the Seventeenth Green Development. Work on the 120-unit Seventeenth Green apartment project in Fort Lauderdale's suburbs is running three weeks ahead of anticipated schedule and Arbib credits the gunning technique fully for this record. John Gaul recommended the concrete gunning system. Gunite column forming has been successfully used in other parts of Florida for over a year and a half by Certified Gunite Company of Miami. This firm pioneered the technique, using the same high-capacity Airplaco Concrete Guns employed in building swimming pools.
"Structural support columns gunned with this equipment reach their rated strength faster than when they're poured in the conventional manner," according to Mr. Arbib. "There are no voids-air spaces where concrete does not form a solid mass and the forms necessary are minimal compared to those needed for a conventional pour. The columns not only reach rated strength faster, but as they cure, they exceed it."
With some 1800 columns going into the Seventeenth Green development, the speed and economics constitute a major advance in concretehandling. As applied by Certified Gunite Company, only the simplest plywood panels are required to form columns -even corners. The system dispenses with clamps, snap-ties, shoes, and all other form hardware. Columns can be gunned by the Airplaco equipment "14 feet high or up to the sky" in one application-without cranes, buckets or vibrators. Concrete gunned at high velocity "can be substantially better than conventionally placed concrete because the low water/cement ratio provides higher strength than high slump concretes, and because there is very must less honey-combing., Mr. Christopher G. Tyson, Construction Control Supervisor, wrote to members of the South Florida Building Officials Council.
The Airplaco Nucretor Concrete Gun used on the Hallandale project is capable of production rates up to 14 cu. yds. per hour. It is supplied by an Airplaco Mix-Elevator that proportions automatically and mixes con-tinuously the desired sand/cement blend. This mix is carried through the Nucretor's material hose and shot by a high-velocity, compressed air stream to the nozzle. Here it is completely hydrated just prior to the instant it is deposited onto the surface at a speed of 400-500 ft. per second. This method of column construction produces a concrete of extraordinary mechanical values, plus extreme hardness, low permeability offering resistance to de-terioration under conditions that could be damaging or destructive to ordinary poured concrete or other ma-sonry.
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