By Bruce R. Doe
About The Product
Published via the yank Geophysical Union as a part of the Field journey Guidebooks Series.
This afternoon journey in downtown Washington, D.C., will enable research of toxins, structural, and different kinds of wear and tear to buildings with emphasis on these built of excellent- to coarse-grained marble yet with representatives of limestone and crimson sandstone. The journey will comprise so as of exam [date of labor initiated (i) and/or occupied (o.) and stone type]: the Renwick Museum (1859o., crimson sandstone trim changed 1987), Corcoran Museum (1879c. enlarged 1927, coarse-grained marble), crimson go constructions (1915i.-1917o., 1927i., fine-grained marble), Memorial Continental corridor of the Daughters of the yankee Revolution, DAR (1904i.-1909o., fine-grained marble), Pan American Union development (1908i.-1910o., coarse-grained marble), structure corridor (DAR) (1929o., limestone), Washington Monument (1885o., marble), Jefferson Memorial (1943o., external of fine-grained marble), and Lincoln Memorial (1922o., very fine-grained marble). Coarse-grained marble is in general extra proof against pollutants harm than fine-grained marble. Direct publicity to the weather hurries up degradation. the main serious toxins harm happens to balustrades and columns: runoff from bronze onto fine-grained marble may also reason critical degradation. Any kind of overhang has a tendency to guard the underlying stone, yet exceptions might be obvious on the Jefferson Memorial. commonly, vertical partitions have much less toxins harm than horizontal surfaces that could start to convey roughening inside years of install. Limestone in universal use is strangely immune to degradation owing, at the very least partly, to the porous nature of the stone that inhibits runoff. If one of many journeys is made to the Powell development of the U.S. Geological Survey in Reston, Virginia (1974o., concrete), it is going to be noticeable that concrete behaves very like limestone and marble.
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