Experimental tests on post-tensioned PC girders with grouting defects under different prestressing levels: preliminary results

During last decades, prestressed reinforced concrete (PC) was widely used in the construction of bridge decks. Recent assessments of existing bridges demonstrated how degradation phenomena and construction defects can significantly reduce performance levels of PC elements. In the case of post-tensioned tendons, insufficient grouting of ducts is one of the most common types of defects in existing girders. This paper presents preliminary results of an experimental testing program on 1/5 scale PC bridge girders. The specimens were casted in different configurations including local voids and lacking grout within ducts, while varying the prestress level in the tendons. Experimental outcomes provide useful information for load-bearing capacity assessment of PC girders with defective grout.