A non destructive testing method for masonry by using UPV and cross validation procedure
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ORIGINAL ARTICLE
A non destructive testing method for masonry by using UPV and cross validation procedure E. Vasanelli
. F. Micelli . D. Colangiuli . A. Calia . M. A. Aiello
Received: 18 June 2020 / Accepted: 3 October 2020 RILEM 2020
Abstract The paper presents a new procedure to assess the compressive strength of regular masonry starting from results of non-destructive ultrasonic pulse velocity tests (UPV) on the constituent materials. The procedure has been calibrated on a soft calcarenitic stone used in the heritage masonry of Southern Italy, and starts from the knowledge of the regression between UPV and the compressive strength (UCS) of the material, determined by means of a wide experimental campaign on different varieties of quarry samples. Through an improved cross validation technique, the proposed method allows to estimate the compressive strength of new samples by making only non-destructive measurements without the need to conduct compression tests. The quality of the procedure was assessed both at the block scale and at the E. Vasanelli (&) D. Colangiuli A. Calia Institute of Heritage Science-National Research Council (ISPC-CNR), via per Monteroni, 73100 Lecce, Italy e-mail: [email protected] D. Colangiuli e-mail: [email protected] A. Calia e-mail: [email protected] F. Micelli M. A. Aiello Department of Engineering for Innovation, University of Salento, via per Monteroni, 73100 Lecce, Italy e-mail: [email protected] M. A. Aiello e-mail: [email protected]
wall scale by comparing the estimated results with those obtained experimentally. In particular, the experiments were performed using new quarry stone blocks and blocks taken from existing walls of two ancient buildings during restoration works. The proposed method has proven to be reliable for the investigated material and it is easy to apply also for other materials as soon as it is possible to carry out a preliminary calibration in the laboratory, which allows knowing the UPV–UCS relationship over a wide range of strengths. Keywords Non destructive test Mechanical characterization of masonry Soft building limestone Cross validation procedure Predictive performance of regression models Ultrasonic pulse velocity
1 Introduction The structural monitoring of existing masonry is still a complex task due to different reasons: the great variability of construction techniques, the complexity of the geometry, the wide range of material used, the different state of damage, the possible presence of retrofitting/repair interventions carried out over time, etc. [1]. Nevertheless, its knowledge is the base for the assessment of the structural safety and of the design of possible interventions. The process should start from
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the knowledge of the building and its construction techniques that in most cases and for the above mentioned drawbacks, requires a considerable effort of in-site investigations. It is worth underlining that the most part of existing masonry constructions i
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