Please use this identifier to cite or link to this item:
Title: Physical characteristics of Globigerina Limestone using ultrasonic and thermographic methods
Authors: Diana, Giuseppe
Cassar, JoAnn
Zammit, Gabrielle
Keywords: Limestone -- Malta
Building stones -- Malta
Geology -- Malta
Historic buildings -- Conservation and restoration -- Malta
Issue Date: 2014
Publisher: Geological Society of London
Citation: Diana, G., Cassar, J., & Zammit, G. (2014). Physical characteristics of Globigerina Limestone using ultrasonic and thermographic methods. Quarterly Journal of Engineering Geology and Hydrogeology, 47, 251-257.
Abstract: The Globigerina Limestone of the Maltese Islands, widely used in construction and for restoration purposes, comes in a variety of types, with the Franka and Soll types (local terms) being the end members. The Soll type manifests widespread and often serious problems of durability and weathering resistance. The Franka type tends to be more durable. The selection of these materials is generally entrusted to quarry workers and builders, who primarily use visual criteria. This can lead to unsuitable stone being used. The current study uses ultrasonic and thermographic methods to distinguish between the two types at the extreme ends of the range, and to determine how their water absorption characteristics (fundamental when durability is being considered) can be evaluated. Results show that the Franka and Soll types behave very differently; ultrasonic testing showed that the Franka type possesses a significantly higher velocity compared with the Soll type; the thermographic technique verified that the Soll type absorbs less water by capillarity. Having an objective test to distinguish between stone types can lead to fewer errors in the choice of stone; such errors at present are possible because of the subjectivity of the methods used, with ensuing grave economic and practical consequences.
Description: These studies are part of the work performed under an agreement between G. Diana. (PhD, University of Cagliari), the Department of the Built Heritage and the Department of Metallurgy and Materials Engineering of the University of Malta. Further studies on Globigerina Limestone are in progress.
Appears in Collections:Scholarly Works - FacBenCBH

Files in This Item:
File Description SizeFormat 
Physical characteristics of Globigerina Limestone using ultrasonic and thermographic methods.pdf
  Restricted Access
1.51 MBAdobe PDFView/Open Request a copy

Items in OAR@UM are protected by copyright, with all rights reserved, unless otherwise indicated.