The safety evaluation of existing RC buildings strictly depends on the accurate evaluation of the concrete compressive strength. The most consistent way to determine this property is by means of testing on concrete cores extracted from the actual structures. However, non-destructive testings like the SonReb method would be preferred because they do not damage structures, but they are not as reliable as destructive ones. In particular, it is well known in the literature that one of the most important issues encountered using the SonReb method on existing structures is the effect of carbonation of concrete surface. Infact it alters the concrete physico-mechanical characteristics, producing rebound index measures that are no more a good depiction of the effective inner concrete properties. In this work, Authors have developed an improvement of the SonReb method by taking into account, as an additional input parameter, the thickness of the carbonated concrete layer. Using experimental data obtained from existing structures they have shown how this method resulted in a significantly improved accuracy against other traditional NDTs.
Improved sonreb method for the assessment of carbonated concrete
BRECCOLOTTI, Marco;BONFIGLI, MASSIMO FEDERICO
2015
Abstract
The safety evaluation of existing RC buildings strictly depends on the accurate evaluation of the concrete compressive strength. The most consistent way to determine this property is by means of testing on concrete cores extracted from the actual structures. However, non-destructive testings like the SonReb method would be preferred because they do not damage structures, but they are not as reliable as destructive ones. In particular, it is well known in the literature that one of the most important issues encountered using the SonReb method on existing structures is the effect of carbonation of concrete surface. Infact it alters the concrete physico-mechanical characteristics, producing rebound index measures that are no more a good depiction of the effective inner concrete properties. In this work, Authors have developed an improvement of the SonReb method by taking into account, as an additional input parameter, the thickness of the carbonated concrete layer. Using experimental data obtained from existing structures they have shown how this method resulted in a significantly improved accuracy against other traditional NDTs.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
