Effect of pre-existing longitudinal and transverse corrosion cracks on the flexural behaviour of corroded RC beams

Nasser, Hussein; Verstrynge, Els

doi:10.1016/j.conbuildmat.2021.126141

Cited by 13 publications

(3 citation statements)

References 37 publications

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“…The bridges inevitably suffer from different degrees and different types of diseases under the effect of external long-term environmental corrosion and cyclic vehicle load [1][2][3]. Cracks are the main forms of diseases of existing reinforced concrete (RC) bridges [4][5][6]. The reinforcement will be corroded with the propagation of cracks, further accelerating the degradation of structural stiffness and bearing capacity [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Theoretical Prediction Model of Flexural Bearing Capacity of Pre-Cracked RC Beams

Zhou

Yan

2023

Applied Sciences

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Cracking is one of the main diseases of small- and medium-span reinforced concrete (RC) bridges. It is a key problem to determine the change in mechanical properties of RC beams after cracking in bridge-performance evaluation. The present study performs static loading tests on seven simply supported T-beams with different crack damage conditions. The influences of crack location, crack depth and steel-bar diameter at a prefabricated crack on the stress, deflection and crack distribution pattern of pre-cracked test beams are investigated. The failure mode and mechanism of pre-cracked beams are revealed. Based on the experimental results, a finite element model of a pre-cracked beam is developed and validated. Following this, a theoretical prediction method is proposed to calculate the ultimate load of pre-cracked RC beams. The results indicate that the direct damage to mid-span section size can significantly affect the stiffness of the RC beam. The local damage of the tensile steel section has insignificant influence on the overall stiffness of the beam. The stiffness degradation of the pre-cracked beam at the quarter span is smaller than that of the pre-cracked beam at mid-span. The strain of the T-beam section in the pre-cracked test conformed to the assumption of the flat section. The experimental observations are in good agreement with the theoretical predictions, which can provide a theoretical basis for the performance evaluation of existing RC beams.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Theoretical Prediction Model of Flexural Bearing Capacity of Pre-Cracked RC Beams

Zhou

Yan

2023

Applied Sciences

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“…On the one hand, chloride-induced corrosion is the most frequently occurring degradation mechanism [1]. On the other hand, this type of damage can lead to pitting, a very local reduction of the reinforcing bar (rebar) diameter, which can result in sudden and unexpected decreases of the structural capacity [2,3]. Since large economic and societal losses are generally at stake when civil structures become deteriorated, it is necessary to investigate, monitor and assess corroding concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Preliminary results on acoustic emission and vibration-based monitoring of locally corroded reinforced concrete beams

Vandecruys¹,

Martens²,

Steen³

et al. 2022

eJNDT

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The current tendency to increase the lifetime of reinforced concrete (RC) structures creates concerns about their serviceability and safety. Reinforcement corrosion is the most common deterioration process in RC, which can severely decrease the structural capacity. Corrosion causes a reduction of the rebar’s cross section, cracking and spalling of the concrete cover due to the expansion of the corrosion product and a decrease of the bond strength at the reinforcement-concrete interface. Assessing the structural capacity of corroded existing structures remains an important issue to maintain good safety and to achieve more targeted repairs. On-site quantification of structural reliability requires advanced non-destructive techniques to evaluate the damage and efficient methods for structural health monitoring. This paper presents the initial results of an experimental campaign on corroding RC beams. Beams with a length of 3 m are subjected to local accelerated corrosion while being monitored with the acoustic emission (AE) technique and dynamic vibration testing (DVT). AE investigates the damage progress and underlying causes of the cracks. When cracks are formed, the stress redistribution in the material causes elastic waves, which can be recorded by piezoelectric transducers placed on the surface of the beam. Examination of the waveforms allows for a localization and characterization of the damage source. Additionally, DVT observes the change in modal parameters of the beams, measured by accelerometers. These changes can be related to a loss of stiffness in the structure, resulting in a perception of the decrease in structural capacity. The combination of local (AE) and global (DVT) monitoring techniques improves the damage inspection as both the damage process and the loss of stiffness are observed. The results of AE provides information when the cracks have not yet reached the surface, while DVT is most relevant when severe damage already occurred. After corrosion, a four-point bending test is performed to evaluate the remaining structural capacity.

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“…With the rapid development of infrastructure worldwide, the number of reinforced-concrete (RC) bridges has increased rapidly. For RC bridges, they are often exposed to many threats including corrosion, fatigue loading, and fire during their service [ 1 , 2 , 3 ]. Notably, if RC beams are not properly designed, then their material mechanical properties of reinforcement and concrete are severely degraded under the action of fire, and drastic internal-force redistribution occurs in the structure [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Flexural Performance of UHPC–NC Laminated Beams Exposed to Fire

Zhou

Sheng

2022

Materials

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In recent decades, reinforced-concrete bridges have experienced premature deterioration and other problems during service due to severe environmental effects such as fire and corrosion. Previous studies have shown that the use of ultra-high-performance concrete (UHPC) can improve the durability of bridge structures. In this study, four-point bending tests were conducted on twelve UHPC–NC laminated beams with different UHPC-layer heights and at different temperatures in order to evaluate their flexural performance under fire conditions. The test variables were the UHPC heights (20 mm, 50 mm, 80 mm) and temperatures (20 °C, 200 °C, 400 °C, 600 °C), and the effects on the flexural load capacity of UHPC–NC laminated beams under the influence of these factors were investigated. The test results show that the increase in temperature causes the concrete color to change from grayish blue to white and leads to a significant decrease in the flexural load capacity of the stacked beams. The height of the UHPC layer has an important effect on the stiffness of the stacked beams and delays the formation of local cracks, thus improving the durability of the stacked beams.

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Effect of pre-existing longitudinal and transverse corrosion cracks on the flexural behaviour of corroded RC beams

Cited by 13 publications

References 37 publications

Experimental Investigation and Theoretical Prediction Model of Flexural Bearing Capacity of Pre-Cracked RC Beams

Experimental Investigation and Theoretical Prediction Model of Flexural Bearing Capacity of Pre-Cracked RC Beams

Preliminary results on acoustic emission and vibration-based monitoring of locally corroded reinforced concrete beams

Experimental Study of Flexural Performance of UHPC–NC Laminated Beams Exposed to Fire

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