Properties of the Ignimbrites in the Architecture of the Historical Center of Arequipa, Peru
Source abstract
Abstract
The petrographic and petrophysical characteristics of three varieties of ignimbrites used in the architectural heritage of Arequipa (southwest Peru) are analyzed. The modal classification QAFP and TAS diagram discriminate their dacitic nature. Mercury injection porometry revealed very high porosity: 46.5% for white and beige ignimbrites, and 35.5% for the pink variety. Ignimbrites contain intrusions of vulcanodetrital fragments and vacuoles that influence their predominantly non-linear mechanical behavior. The results of water absorption by capillarity (C) and ultrasound pulse velocity (UPV) demonstrate a slight anisotropy for the beige variety and near isotropy for white and pink ignimbrites, which justify the randomness of the application of the ashlars in the masonry and in the selection of the faces to carve. Surfaces with hollows in the white and beige ignimbrites are the result of the erosion of the acicular pumice that fills the vacuoles.
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Research context
OpenAlex topics: Building materials and conservation · Cultural Heritage Materials Analysis · Geological and Geophysical Studies Worldwide
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Escuela Técnica Superior de Arquitectura, Universidad Politécnica de Madrid, Av. Juan de Herrera, 28040 Madrid, Spain
GEGENAA EA3795, Université de Reims Champagne-Ardenne 2, Esplanade Roland Garros, 51100 Reims, France
Ministerio Para la Transición Ecológica (MITERD-OECC), Avda San Juan de La Cruz, 10, 28071 Madrid, Spain
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