Masonry Magazine October 1995 Page. 43
Concrete Structure
In addition to the chip-mix cellular concrete, Dolese Brothers supplied varying designs for structural mix. Columns for the all concrete structure also used a chip mix that contained a superplasticizer and ranged between 6,000 and 8,000 psi, according to Dolese's Jim Clymer.
Deck concrete used a Class A. 11/2 inch crushed limestone, a W.R. Grace admixture, five to six percent air entrainment, and a water reducer. Design strength for the 52-inch pan-formed decks was 3,500 to 4,000 psi, except for the higher strength mix used around columns and core walls.
Designed by the architectural engineering firm HTB, Incorporated, the 550,000-sq-ft structure is a maximum security facility that will temporarily house prisoners enroute to prisons throughout the country. The six-pod design has cell blocks at levels three, four, five and six, says HTB's Darrell Stevens, project manager. A mezzanine extends to the seventh level, and a circular eighth level above the core will house some mechanical installations and elevators.
The facility will provide permanent employment for 250, says Stevens.
While bids were received for both pre-cast and poured-in-place wall construction, Stevens says the reinforced grout filled block design was selected for security reasons, no formwork requirements, and greater ease in building a complicated hexagonal design with multiple angles for six pods. And blocklayers, it was determined, could readily construct interior door openings, partitions and mechanical enclosures. Manually applied. Additional labor requirements included the block layers and rebar installers, vibrator operators, pump crews and forklift operators-in all, well over fifty workers, Cook says. And while wall forming wasn't a requirement, portable scaffolding was needed for block installation and grouting.
GLASS BLOCK
Continued from Page 17
panels will suffer damage. The g-forces were greatest in Northridge, which was the region of the epicenter; however, the ground shaking was very intense in other areas, such as Santa Monica.
A detailed survey was made of the performance of structures containing Pittsburgh Corning glass block panel applications located in the cities of Northridge and Santa Monica. The epicenter was located in Northridge and thus its selection is self-evident. The City of Santa Monica was selected because the ground shaking was intense and the architectural fabric of the city contains considerable quantities of glass block.
In all sites visited, the glass block walls and panel systems that were designed and constructed in accordance with Pittsburgh Corning specifications and the provision of the UBC (1991 UBC, Sec 2407, p. 225) resisted the g-force without failure. In these two cities, the magnitude of the g-force was at least two times greater than the g-force used for the design of the glass block panel systems.
The advantage of glass block is that it offers a building material to the architect that can provide both light and privacy. Therefore, the glass block panels that were examined contained a wide variety of creative architectural styles.
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MASONRY-SEPTEMBER/OCTOBER, 1995 43