Behavior of corroded bonded fully prestressed and conventional concrete beams

Abstract

Prestressed concrete is widely used in the construction buildings. And corrosion of steel is one of the most important and prevalent mechanisms of deterioration for concrete structures. Consequently the capacity of post-tension elements decreased after exposure to corrosion. This study presents results of the experimental investigation of the performance/behavior of bonded fully prestressed and conventional concrete beams, with 40 MPa compressive strength exposed to corrosion. The experimental program of this study consisted of three fully prestressed and two conventional concrete beams with overall dimensions equal to 150 Â 400 Â 4500 mm. The variables were considered in terms of corrosion exposure effect, prestressed level, and corrosion location effect for fully prestressed beams. Mode of failure, cracking width/distribution, ultimate load and the corresponding deflection of each beam were recorded. The results showed that the fully prestressed beam in comparison with conventional beam was considered to be even more resistance to corrosion because it was perceived to be crack-free as a result of prestressing. Also the mention deterioration incident in fully prestressed beams fully corrosion exposure level unnoticed that deterioration incident in partially corrosion exposure level. The most of deterioration incident in fully prestressed beam acts on compression of non-prestressed steel reinforcement. Because the bonded tendons are less likely to corrode. Cement grout/duct is a barrier to moisture and chloride penetration,

On the Effectiveness of Vibration-Based Monitoring for Integrity Management of Prestressed Structures

“…This result is general and independent of the beam geometry. In Figure 8, the variation of the ultimate moment with the decrease of the tendon area obtained for the prestressed beam in the previous numerical example is compared with the experimental values obtained in [52] for a fully prestressed specimen. Despite the radical difference in geometry of the section and the fact that the AASHTO beam is connected to a reinforced concrete slab, the behavior is almost identical.…”

Flexural Behavior of Post-Tensioned Concrete Beams with Multiple Internal Corroded Strands

“…Moawad et al [5] fabricated bonded fully PC beams with accelerated corrosion using electrochemical techniques. After flexural tests had been conducted, the results showed that the flexural strength had been reduced by up to 10%, and that the ductility and initial stiffness were reduced compared to the non-corroded specimens.…”