The results of an extensive experimental investigation on reinforced concrete bridge decks of the Orte-Ravenna highway (E45) in Italy are reported in this paper. The main investigation object is the reinforced concrete slab of the “Fornello” viaduct which was destined to demolition, since it exhibited serious structural deficiencies. The investigation is carried out by using non-destructive techniques, based on ultrasonic evaluation and termography, as well as producing chemical, physical and mechanical characterization of specimens drawn from damaged and undamaged regions of the R/C bridge decks. The distribution of chlorides and sulphates into the slab thickness is analysed by means of ion chromatography, which has revealed also the presence of organic anions such as formiate and acetate. Frost sensitivity of cement paste is detected by mercury porosimetry. The study is aimed to evaluate the level of concrete damage, to investigate the causes of degradation, and to assess a possible strengthening technique for repair.
Investigation of a deteriorated reinforced concrete infrastructure and possible repair
CAPUANI, Domenico;APRILE, Alessandra
2008
Abstract
The results of an extensive experimental investigation on reinforced concrete bridge decks of the Orte-Ravenna highway (E45) in Italy are reported in this paper. The main investigation object is the reinforced concrete slab of the “Fornello” viaduct which was destined to demolition, since it exhibited serious structural deficiencies. The investigation is carried out by using non-destructive techniques, based on ultrasonic evaluation and termography, as well as producing chemical, physical and mechanical characterization of specimens drawn from damaged and undamaged regions of the R/C bridge decks. The distribution of chlorides and sulphates into the slab thickness is analysed by means of ion chromatography, which has revealed also the presence of organic anions such as formiate and acetate. Frost sensitivity of cement paste is detected by mercury porosimetry. The study is aimed to evaluate the level of concrete damage, to investigate the causes of degradation, and to assess a possible strengthening technique for repair.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
