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In some countries floors are made with clay blocks. For their characterization it would be useful to know the fracture energy, the higher the fracture energy the better the composite structure behaviour. In order to obtain sufficient data it is necessary to evaluate the dimension of the fracture process zone during the crack propagation and to establish the stress-crack opening relationship. In this paper the authors describe the application of Electronic Speckle Pattern Interferometry (ESPI) techniques, in connection with a large experimental programme on notched clay specimens obtained from clay blocks of normal production. Even though clay material is characterized by very limited strains at crack propagation, the high sensitivity of the equipment led to an interesting result and allowed quantitative analysis of cracking phenomenon.

Additional information

Authors: BOSCO C, Politecnico di Torino, Department of Structural Engineering (IT);CADONI E, JRC Ispra (IT);FACCHINI M, Ecole Politecnique Federale de Lausanne (CH)
Bibliographic Reference: Paper presented : Nondestructive Testing of Concrete in the Infrastructure, Nashville (US), June 12-14, 1996
Availability: Available from (1) as Paper EN 39957 ORA
Record Number: 199610972 / Last updated on: 1996-09-30
Original language: en
Available languages: en
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