In recent years, a lot of studies upon built heritage emphasize the need to use appropriate techniques to evaluate the current condition of the structure before designing an intervention. In fact, the technicians very often encounter a lot of economic and logistical problems that don’t always give possible to plan suitable diagnostic tests; and that need regards whether the masonry buildings or reinforced concrete buildings. The research focuses on the recovery of reinforced concrete buildings, that now beginning to show signs of decay and deterioration. In the reinforced concrete structures, the most important properties are - among others - the concrete compressive strength, the concrete condition and steel bars yield strength and fracture. Through the concrete compressive strength, it can be obtained other concrete properties, such as elastic modulus, tensile strength and durability. So to do this, it can be used the “destructive” methods (that required a local material removal) and “non-destructive” tests such as the sclerometer, the ultrasonic test and the combined method called “SonReb”. The combined results from different “non-destructive” tests are a very interesting instrument to evaluate the concrete strength. This methodological approach can help us to reduce the possible errors made by using the sclerometer and ultrasonic tests separately; in this way, it was developed the combined method called “SonReb” (SONic + REBound). In fact, it been noticed that the umidity content of a structural element underestimates the sclerometer index and - at the same time - overestimates the ultrasonic speed. Using a combined method it make it possible to balance some of the errors made using separately the two methodologies. Moreover, this combined method requires short time to carry out the results, it’s non invasive method and it does not affect the resistance of structural elements. The above defined methodology has been tested on a post-war building which is located in Gravina in Puglia (Italy): the “Centrone” Theatre; it was realized using a mixed structure - reinforced concrete and bearing masonry built using local stone. The building was used until the Nineties and now is abandoned. The diagnostic tests have shown an enough high speed and homogeneous surface values. It was also compared these data with the method “SonReb” to improve - as said before - the qualitative interpretation of results; the analysis showed an satisfactory results upon the state of concrete conservation. The analysis and qualification of the masonry structures of built heritage shows how this approach is useful to classifying the pathological events that regard each building and to implement the innovative solutions that allow the durability of a recovery intervention.

The “SonReb” method for qualifying the reinforced concrete structure

GUIDA, Antonella Grazia;PAGLIUCA, ANTONELLO;
2011

Abstract

In recent years, a lot of studies upon built heritage emphasize the need to use appropriate techniques to evaluate the current condition of the structure before designing an intervention. In fact, the technicians very often encounter a lot of economic and logistical problems that don’t always give possible to plan suitable diagnostic tests; and that need regards whether the masonry buildings or reinforced concrete buildings. The research focuses on the recovery of reinforced concrete buildings, that now beginning to show signs of decay and deterioration. In the reinforced concrete structures, the most important properties are - among others - the concrete compressive strength, the concrete condition and steel bars yield strength and fracture. Through the concrete compressive strength, it can be obtained other concrete properties, such as elastic modulus, tensile strength and durability. So to do this, it can be used the “destructive” methods (that required a local material removal) and “non-destructive” tests such as the sclerometer, the ultrasonic test and the combined method called “SonReb”. The combined results from different “non-destructive” tests are a very interesting instrument to evaluate the concrete strength. This methodological approach can help us to reduce the possible errors made by using the sclerometer and ultrasonic tests separately; in this way, it was developed the combined method called “SonReb” (SONic + REBound). In fact, it been noticed that the umidity content of a structural element underestimates the sclerometer index and - at the same time - overestimates the ultrasonic speed. Using a combined method it make it possible to balance some of the errors made using separately the two methodologies. Moreover, this combined method requires short time to carry out the results, it’s non invasive method and it does not affect the resistance of structural elements. The above defined methodology has been tested on a post-war building which is located in Gravina in Puglia (Italy): the “Centrone” Theatre; it was realized using a mixed structure - reinforced concrete and bearing masonry built using local stone. The building was used until the Nineties and now is abandoned. The diagnostic tests have shown an enough high speed and homogeneous surface values. It was also compared these data with the method “SonReb” to improve - as said before - the qualitative interpretation of results; the analysis showed an satisfactory results upon the state of concrete conservation. The analysis and qualification of the masonry structures of built heritage shows how this approach is useful to classifying the pathological events that regard each building and to implement the innovative solutions that allow the durability of a recovery intervention.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/18225
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