Fatigue behaviour analysis for the durability prequalification of strengthening mortars

Bocca, Pietro Giovanni; Grazzini, Alessandro; Masera, Davide

doi:10.1088/1742-6596/305/1/012041

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…The correlations between non-destructive tests and laboratory tests will be calibrated for the different types of historic masonry walls. The results of this experimental research may also be useful for further specific shear tests between strengthening mortars and stone structures [40], in order to model the behavior of the mortar-stone composite system, as already carried out in other research studies [41,42], and to validate the mechanical compatibility and durability of strengthening materials to be applied on damaged masonry structures.…”

Section: Discussionmentioning

confidence: 83%

Mechanical Properties of Historic Masonry Stones Obtained by In Situ Non-Destructive Tests on the St. Agostino Church in Amatrice (Italy)

Grazzini

Lacidogna

2021

Applied Sciences

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The design of strengthening and securing work for historic buildings requires knowledge of the masonry mechanical characteristics, often obtainable through laboratory tests that require invasive samples. The non-destructive techniques, applicable in situ in a rapid and non-invasive way, represent a valid alternative to estimate mechanical strengths without destructive sampling. In this study, a methodology was calibrated which, by combining the results of the ultrasonic and impact tests, makes it possible to reach a good estimate of the compression strength and elastic modulus of a particular rock: sandstone. Most buildings in Amatrice, the city devastated by the violent earthquake of Central Italy in 2016, were built by means of this sedimentary rock. By carrying out a diagnostic campaign on the remaining walls of the St. Agostino church in Amatrice, it was possible to obtain a correlation, specific for this case study, between the compression strengths from laboratory tests and the results of the ultrasonic and impact tests. Unlike the traditional Sonreb methods, this methodology wanted to favor the use of the impact method instead of the sclerometrer test. In this way, it will be possible to operate on other damaged buildings of similar construction types located in the seismic crater of Amatrice, evaluating the mechanical characteristics of the masonry structures be means of in situ non-destructive tests in order to design the safety and strengthening work.

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Section: Discussionmentioning

confidence: 83%

Mechanical Properties of Historic Masonry Stones Obtained by In Situ Non-Destructive Tests on the St. Agostino Church in Amatrice (Italy)

Grazzini

Lacidogna

2021

Applied Sciences

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“…Moreover, this qualitative assessment was according to the values of compressive strength and elastic modulus obtained from the double flat jacks test. The sonic values obtained also demonstrated the ineffectiveness of the mortar injections to penetrate and therefore, to contribute to the increase in masonry strength [22,23]. Although a comparison with the sonic values cannot be performed before the injection operation, such low values cannot correspond to an effectively injected masonry.…”

Section: Discussionmentioning

confidence: 91%

Sonic and Impact Test for Structural Assessment of Historical Masonry

Grazzini

2019

Applied Sciences

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Diagnostics is a very important tool of knowledge in the field of historical buildings. In particular, non-destructive techniques allow to deepen the study of the mechanical characteristics of the historical walls without compromising the artistic value of the monumental building. A case study of the use of sonic and impact tests was described, performed using the same instrumented hammer, for the characterization of the masonry walls at the Sanctuary of Santa Maria delle Grazie at Varoni, one of the churches damaged in the 2016 Amatrice earthquake. Sonic tests showed the presence of a discontinous masonry texture, as well as confirming the ineffectiveness of the strengthening work made by injections of lime mortar. The impact test allowed us to obtain the elastic modulus of the omogeneous stones of the masonry. The results obtained from the non-destructive techniques were confirmed by the flat jacks test carried out on the building, confirming the great potential of the non-destructive diagnostics suitable for analyzing important structural parameters without affecting the preservation of historical masonry structures.

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“…The phases that govern their conduct, from the diagnostic project to the choice of material and its final application, are often affected by different and concomitant errors or shortcomings. This means that in a present in which the progress of knowledge is supported by the availability of refined investigation and analysis procedures and in a technological context which would make it possible to fulfil the production of very high-quality materials, it is becoming increasingly complex to operate in such a way as to limit the repetition of operations that soon turn out to be ineffective [8,9].…”

Section: Introductionmentioning

confidence: 99%

Operational atlas of exposed mortars and conglomerates for interventions on the widespread architectural heritage

Fasana¹,

Zerbinatti²,

Grazzini³

et al. 2020

tema

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When it comes to Science Heritage, the availability of refined investigation techniques, an advanced knowledge of the characteristics of materials, the current technological capacity and the synergy of specialised operators, coordinated into multidisciplinary teams, guarantee, with the support of cutting-edge tools, excellent results for every conservative operation applied to monumental buildings of acknowledged interest. On the contrary, there are still strong limits to the likelihood that this excellence will reverberate on the multitude of interventions performed on widespread architectural heritage. The research project underway envisages the preparation of an operational atlas of reference for exposed mortars and conglomerates, based on the historical and technological knowledge of materials (particularly those available locally) complete with experimental data on constitution and performance, which is useful to support the development of compatible maintenance and conservation procedures.

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Fatigue behaviour analysis for the durability prequalification of strengthening mortars

Cited by 6 publications

References 6 publications

Mechanical Properties of Historic Masonry Stones Obtained by In Situ Non-Destructive Tests on the St. Agostino Church in Amatrice (Italy)

Mechanical Properties of Historic Masonry Stones Obtained by In Situ Non-Destructive Tests on the St. Agostino Church in Amatrice (Italy)

Sonic and Impact Test for Structural Assessment of Historical Masonry

Operational atlas of exposed mortars and conglomerates for interventions on the widespread architectural heritage

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