Difference between revisions of "Sphinxstone"

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[[File:Sphinxstone Mellon.jpg|thumb]]
 
==Description==   
 
==Description==   
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[Sphinx Acoustical Company] A cast acoustic building stone.
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[Sphinx Acoustical Company] An acoustic [[cast stone]] produced by the Sphinx Acoustical Company.  In 1934, Sphinxstone was used in the construction of the Mellon Auditorium in Washington DC. During restoration of the building, visual inspection of the stone indicates that mollusk shell, and white Portlands were used in the concrete mixture.  Other fillers and binders are unknown.
 
[[File:Sphinxstone label 2.png|thumb|Sphinxstone label]]
 
[[File:Sphinxstone label 2.png|thumb|Sphinxstone label]]
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==Resources and Citations==
 
==Resources and Citations==
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* Scott Lynn Paden, contribute information, June 2022.
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* Scott Lynn Paden, [http://www.citadeldca.com Citadel DCs] contributed information, June 2022.
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* Richard Pieper, 'The Maintenance, Repair and Replacement of Histoic Cast Stone' NPS, Technical Briefs #42 [https://www.nps.gov/tps/how-to-preserve/briefs/42-cast-stone.htm Link]
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* Richard Pieper, 'The Maintenance, Repair and Replacement of Historic Cast Stone' NPS, Technical Briefs #42 [https://www.nps.gov/tps/how-to-preserve/briefs/42-cast-stone.htm Link]
  
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materials and finishes at the Mellon Auditorium in Washington, DC. This Neoclassical hall by Arthur Brown, and built in 1934 is primarily comprised of an acoustic stone known as Sphinxstone and produced by the Sphinx Acoustical Company on which I can find no historical background. This cast composite stone was molded into the various shapes and profiles. It is comprised of mollusk shells with white Portland and is particularly susceptible to impact, especially along arrises. In the hall there are large sections that have been sheared off and many edges that have significant degradation
 
  
 
[[Category:Materials database]]
 
[[Category:Materials database]]
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precast concrete building units
 
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Cast stone was just one name given to various concrete mixtures that employed molded shapes, decorative aggregates, and masonry pigments to simulate natural stone. The basic mixtures included water, sand, coarse aggregate, and cementing agents. Natural cements, portland cements, oxychloride cements, and sodium silicate based cements were all used as binding agents. The differences in the resulting products reflected the different stone aggregates, binding agents, methods of manufacture and curing, and systems of surface finishing that were used to produce them. Versatile in representing both intricately carved ornament and plain blocks of wall ashlar, cast stone could be tooled with a variety of finishes.
 

Revision as of 14:17, 5 June 2022

Sphinxstone Mellon.jpg

Description

[Sphinx Acoustical Company] An acoustic Cast stone produced by the Sphinx Acoustical Company. In 1934, Sphinxstone was used in the construction of the Mellon Auditorium in Washington DC. During restoration of the building, visual inspection of the stone indicates that mollusk shell, and white Portlands were used in the concrete mixture. Other fillers and binders are unknown.

Sphinxstone label

Resources and Citations

  • Scott Lynn Paden, Citadel DCs contributed information, June 2022.
  • Richard Pieper, 'The Maintenance, Repair and Replacement of Historic Cast Stone' NPS, Technical Briefs #42 Link

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