May 1990 Table of Contents

Features Concrete Structure Supports Ecology Research Center

A unique structure at Oracle, Arizona will house a re-creation of the earth's natural climates, life cycles, and systems completely sealed off from the surrounding atmosphere. Called Biosphere II, the 3.1-acre self-contained habitat provides 7 million cubic feet of laboratory space. Read more

Features Concrete Garage Serves Postal Trucks on Four Levels

A 35-million-dollar structure is now home to the United States Postal Service trucks. Their new concrete maintenance center in midtown Manhattan is clad in louvered and solid aluminum panels and rises four stories high. Read more

Features Architectural Concrete Wins for St. Peter's

When construction bids for St. Peter's Lutheran Church building in Columbus, Indiana, exceeded the 3.5-million-dollar original estimate by 70 percent, plans clearly had to be reworked. Eight months later modifications were completed and the cost had been reduced without compromising the original design Read more

Features Skydome Structure Cast in Place

The first season of play in Toronto's new concrete Skydome brought the city's baseball team, the Bluejays, the 1989 American League East pennant. The world's first multipurpose stadium has a retractable roof and will accommodate 56,000 spectators for football, about 59,000 for baseball, and up to 70,000 at concerts. The basic structure of the stadium consists of 48 concrete bents. In addition, the playing field base is a concrete slab. All structural elements are concrete except for the retractable roof and movable bleachers. The basic material of the exterior is also exposed concrete, with limited use of metal grilles and curtain walls. Read more

Features Seattle Lid Covers I-90

Construction of the Seattle Lid and connecting Mount Baker Ridge Tunnel along Interstate 90 reestablished physical continuity and brought together neighborhoods separated years ago. The Lid combines two different types of structural designs. The west end uses a system of prestressed concrete girders supported on continuous box-shaped walls, which serve as ventilation ducting. At the eastern end where the Lid joins with the tunnel, the structure walls resist shear and are tied into aboveground and underground support buildings. The finished ceiling above the roadways is a 4-inch concrete slab suspended by stainless steel hangers. Read more

Features Fast-Tracked Concrete Hotel

The architect of the Sheraton Grande Torrey Pines in La Jolla, California, provided all guests with an ocean view by designing a 30 percent bend in the sidewalls of the rooms. Walls that are 8 inches thick and slabs that are 5.5 inches thick also give guests the added benefits of fire safety and noise resistance. Read more

Features Win More Concrete Work with Color

The use of color, especially in landscape applications, is increasing dramatically as more landscape architects creatively use concrete to achieve their design goals. Read more

Features The Kahn Reinforcing Bar

It is often assumed that Albert Kahn developed the Kahn bar. However, it was actually his brother, Julius, who invented the bar early in the twentieth century. At the beginning of reinforced concrete construction, most of the bars used for tensile reinforcement were square, or less often round, but always plain and not deformed as bars are today. Read more

Features Concrete Hardscape Revitalizes Plymouth, England

In view of the hazards of accidents, pollution, and noise, 70 percent of the local businesses in the city of Plymouth, England, favored pedestrianization. There were several broad avenues from which all vehicular traffic could be withdrawn, freeing the area for a major landscaping scheme with room for both hard and soft features. Read more

Features The New Stone Age

Thin stone panels have made stone affordable and popular again, reopening a market for masonry contractors. Read more

Problem Clinic Concrete Topping for Cellular Concrete

We're doing a rehab job on an old building that's being converted into offices. We tore out a 2-inch-thick wood floor that was too creaky. Beneath it we found 2x8-inch sleepers on 16-inch centers. The voids between sleepers were filled with what looks lik Read more

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