Masonry Magazine January 1980 Page. 24
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24 MASONRY/JANUARY, 1980
Budding Designers Study Block-making
Budding professionals from the New York School of Interior Design recently visited the Plasticrete Block & Supply Corp., North Haven, Conn., to see how concrete masonry block are made. The tour, led by Yale architectural school almnus Prof. Michael Altschuler, included points of outstanding architectural interest in New Haven. Here the group watches as a giant hopper is filled with the wet mixture from which concrete block are formed.
NATIONAL GALLERY OF ART
continued from page 16
Although giving the impression of an enormously heavy stone wall, the fact is that not a single stone anywhere in the walls of the East Building carries the weight of any other stone. Every stone is separately, independently supported, and is surrounded by a specially designed, pliable rubber gasket which absorbs the expansion and shrinkage of each stone without passing that movement on to the surrounding stones.
And, despite the fact that the stones don't rest against each other and no conventional mortar is used between stones, the walls are also perfectly water-tight, according to James W. Mann, vice president of Tompkins Construction Co. and on-site supervisor for the gallery construction.
The unique wall system starts with a 12-inch brick wall. In the wall, at specific intervals, are pre-cast blocks of concrete. The builders attached special steel shelves to the concrete with bolts, and rested the blocks of stone on the shelves.
Aligned in this way, the stones would have rested th of an inch apart. But, in between the stones, Pei put a one-eighth-inch rubber gasket. Thus, the weight of the stone compresses the gasket and forms a tight seal.
What the visitor sees is a smooth, even wall of huge blocks of stone. But the entire system is really held together by the brick back-up wall. Every stone expands and contracts all by itself.
The stone itself comes from the same quarry that produced the marble used in the old National Gallery building which still stands next door. It is arranged in the same pattern of darker stones at the botton, and light shades towards the sky. But instead of stone 18 and 24 inches thick, the new building uses pieces only three or four inches thick. Specially-cut "legs" are used in the corners to give the impression of massive blocks.
To the visitor, the technological innovations that made the new museum possible are invisible. The result-and the craftsmanship that carried Pei's ideas into beautiful reality are very much apparent, in a new jewel of a building that has become Washington. D.C.'s newest center of interest.