Prestress Loss Diagnostics in Pretensioned Concrete Structures with Corrosive Cracking

Dai, Lizhao; Bian, Hanbing; Wang, Lei; Potier‐Ferry, Michel; Zhang, Jianren

doi:10.1061/(asce)st.1943-541x.0002554

Cited by 100 publications

(43 citation statements)

References 33 publications

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“…Grouting quality is one of the focus issues [5]. In the actual cement grouting, owing to the stoppage of the prestressed tendon duct, incorrect grouting method, poor expansion rate of cement slurry and other problems, it is inevitable that the grouting is not compacted and even the void appears in the prestressed tendon duct [6,7]. A prestressed tendon duct is generally embedded in the concrete bridges, and, with the characteristics of invisibility, it is difficult or impossible to directly observe the grouting quality.…”

Section: Introductionmentioning

confidence: 99%

Detecting of the Longitudinal Grouting Quality in Prestressed Curved Tendon Duct Using Piezoceramic Transducers

Jiang

Zhang

et al. 2020

Sensors

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To understand the characteristics of longitudinal grouting quality, this paper developed a stress wave-based active sensing method using piezoceramic transducers to detect longitudinal grouting quality of the prestressed curved tendon ducts. There were four lead zirconate titanate (PZT) transducers installed in the same longitudinal plane. One of them, mounted on the bottom of the curved tendon duct, was called as an actuator for generating stress waves. The other three, pasted on the top of the curved tendon duct, were called as sensors for detecting the wave responses. The experimental process was divided into five states during the grouting, which included 0%, 50%, 75%, 90%, and 100% grouting. The voltage signals, power spectral density (PSD) energy and wavelet packet energy were adopted in this research. Experimental results showed that all the amplitudes of the above analysis indicators were small before the grouting reached 90%. Only when the grouting degree reached the 100% grouting, these parameters increased significantly. The results of different longitudinal PZT sensors were mainly determined by the distance from the generator, the position of grouting holes, and the fluidity of grouting materials. These results showed the longitudinal grouting quality can be effectively evaluated by analyzing the difference between the signals received by the PZT transducers in the curved tendon duct. The devised method has certain application value in detecting the longitudinal grouting quality of prestressed curved tendon duct.

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Section: Introductionmentioning

confidence: 99%

Detecting of the Longitudinal Grouting Quality in Prestressed Curved Tendon Duct Using Piezoceramic Transducers

Jiang

Zhang

et al. 2020

Sensors

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“…The Structural Engineering Institute (SEI) of American Society of Civil Engineers (ASCE) indicates that corrosion has been become one of the biggest threats for the structure safety (Biondini and Frangopol 2018). Corrosion will reduce the cross-section area of strand, lead to the concrete cracking, degrade the bond strength, and eventually cause the flexural deterioration (Dai et al 2020;Zhang et al 2016;Liu et al 2017a;Peng et al 2019;Ma et al 2020). These would lead to the failure of PC structures without warning in severe situation, causing substantial economic losses (Jin et al 2016;Lu et al 2019;Floyd et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Corrosion Morphology and Mechanical Behavior of Corroded Prestressing Strands

Wang

Tang

Dai

et al. 2020

ACT

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The corrosion morphology and the mechanical behavior of corroded prestressing strands are investigated in the present study. Nineteen corroded strands are obtained through controlling stress level, corrosion time and chloride ion concentration under artificial climate conditions. A total of 119 corrosion pits are counted to investigate the geometric morphology of corrosion pits. A depth-width ratio parameter is first defined to describe the distribution law of corrosion pits, which obeys the lognormal distribution. A tension test is conducted to investigate the mechanical behavior of corroded strands. The fracture morphology and micro-cracks of corroded steel wires are observed by the scanning electron microscopy. A constitutive model is proposed to predict the stress-strain curve of corroded prestressing strands and verified by the experimental results. Results show that the maximum corrosion loss of strand increases by 4.91% when the stress level changes from 45% to 75% of strand yield strength. The high stress level can promote the propagation of corrosion micro-cracks on strand surface. The propagation of corrosion micro-cracks has a significant effect on ultimate strength of strand, while has a little effect on elastic modulus. The proposed model can give an accurate prediction for the stress-strain of corroded prestressing strand.

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“…Because of chloride-induced corrosion, the volume of corrosion products of steel bars is 2-6 times that of steel bar usage [1]. e excessive internal pressure of concrete leads to cracking of concrete until structural damage occurs, which causes heavy economic losses [2,3]. erefore, it is important to study concrete cover cracking due to steel corrosion.…”

Section: Introductionmentioning

confidence: 99%

A Prediction Model for Concrete Cracks due to Chloride‐Induced Corrosion

Wang

Zhang

et al. 2020

Advances in Materials Science and Engineering

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The nonhomogeneity of concrete leads to randomness in the development and extension of cracks. Scholars have proposed different models to analyze the development of cracks. Different from existing works on crack development, in this paper, we establish a crack spacing model on the basis of the mechanical equilibrium relation of differential elements. We also establish a mechanical equilibrium model considering that the shrinkage of concrete is constrained by the bonding force of reinforced concrete. Then, on the basis of the equilibrium condition, we propose an analytical model of spacing between the first crack and the second crack at the interface of steel and concrete due to corrosion expansion. This calculation model has only three variables: tensile strength, effective constraint length of the reinforcement, and bond force. In addition, the parameters are clearly defined. We verified the development of cracks at the interface between steel bar and concrete under chloride corrosion at different locations in a steel bar by comparing it with existing simulations and experimental results. The analytical model proposed in this paper has an accuracy of 92%, indicating that our expression for crack spacing can effectively predict the location of cracks.

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Prestress Loss Diagnostics in Pretensioned Concrete Structures with Corrosive Cracking

Cited by 100 publications

References 33 publications

Detecting of the Longitudinal Grouting Quality in Prestressed Curved Tendon Duct Using Piezoceramic Transducers

Detecting of the Longitudinal Grouting Quality in Prestressed Curved Tendon Duct Using Piezoceramic Transducers

Corrosion Morphology and Mechanical Behavior of Corroded Prestressing Strands

A Prediction Model for Concrete Cracks due to Chloride‐Induced Corrosion

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