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Historic Preservation and Conservation

University of Pennsylvania

Argillaceous

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Consolidation Treatments For The Alveolar Erosion Of The Agrillaceous Sandstone At Durham Castle, Mary Catherine Collins Jan 2012

Consolidation Treatments For The Alveolar Erosion Of The Agrillaceous Sandstone At Durham Castle, Mary Catherine Collins

Theses (Historic Preservation)

The thesis addresses possible consolidation treatments for the sandstone masonry of Durham Castle, a UNESCO World Heritage site located in Durham, England. The historic masonry is made of an argillaceous sandstone that suffers a unique deterioration phenomenon known as alveolar erosion. Alveolar erosion is a problem that relates to the geo-chemical nature of the stone, particularly the presence of swelling clays. Two treatments were considered in this thesis: a plain ethyl silicate (Prosoco OH100), and an elastified ethyl silicate (Remmers KSE 300 E). The performance of each treatment was compared through laboratory testing of the following properties: water absorption and ...


Evaluation Of Consolidation Treatments For The San José Convento Column, San Antonio Missions National Historic Park, San Antonio, Texas, Kalen Daniel Mcnabb Jan 2012

Evaluation Of Consolidation Treatments For The San José Convento Column, San Antonio Missions National Historic Park, San Antonio, Texas, Kalen Daniel Mcnabb

Theses (Historic Preservation)

The retreatment of previously consolidated stone has become a common occurrence and an important area of research in the field of architectural conservation. The San José Convento Column within the San Antonio Missions National Historical Park in San Antonio, Texas is a prime example for consideration. Initially analyzed, tested, and treated in 1993 by the Architectural Conservation Laboratory at the University of Pennsylvania, the limestone column is in need of additional treatment. Recent analysis has determined that while the 1993 treatment had been largely successful, microcracks originally present have advanced and surface detachment has worsened, largely due to clay swelling ...