Detecting Onset of Different Types of Flaws in Reinforced Concrete

Garcia, Eric; Erdogmus, Ece; Schüller, M.; Harvey, Donald

doi:10.14359/51710962

Cited by 3 publications

(14 citation statements)

References 3 publications

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“…Corrosion can lead to delamination when left unmanaged. As explained in further detail in [2], chemical delamination forms the first stage of corrosion-related deterioration. These initial stages of corrosion temporarily improve the bond between concrete and steel.…”

Section: Background and Motivationmentioning

confidence: 99%

“…The experimental results presented in this paper are part of a larger study. This portion of the experimental study has four primary objectives in terms of improving both the theoretical foundation and practical applications of the proposed method: (1) to identify the onset and monitor the progression of corrosion products on the rebar in reinforced concrete bridge decks; (2) to examine the influence of directional and multiple layers of reinforcement on the ability of the UGWL arrangement to identify multiple types of early stage flaws; (3) to explore different attachment options and coupling gels for improved coupling conditions between the transducers and test materials (i.e., concrete and rebar); and (4) to perform pilot field trials to understand the real-life challenges associated with the process and identify new research needs related to implementation.…”

Section: Objectivesmentioning

confidence: 99%

“…The purpose of this specimen was to investigate the capabilities of the proposed method for (1) detecting the onset of corrosion in a larger and more complex specimen than those established previously by the authors [1,2] and (2) detecting corrosion and delamination flaws in the same specimen.…”

Section: Setup For the Laboratory Experimentsmentioning

confidence: 99%

“…Specimen Set 2 was a larger reinforced concrete slab measuring 305 cm × 122 cm × 20.3 cm (10 ft. × 4 ft. × 8 in). This specimen was cast (1) to examine the influence of multiple layers and directions of reinforcement on the proposed UGWL method, (2) to test greater distances between the transmitter and receivers than those tested by previous experiments, and (3) to evaluate whether the proposed method can detect a variety of flaws (corrosion, delamination, and cracks) in the same specimen (Figure 3). Each layer of reinforcement had a cover of 6.35 cm (2.5 in.)…”

Section: Specimen Setmentioning

confidence: 99%

“…In the previously published phases of this study, first, the proof of concept for the proposed ultrasonic guided wave leakage (UGWL) method's effectiveness to detect the onset of delamination in reinforced concrete was demonstrated successfully [1]. Then, early detection of the onset of corrosion and cracking in concrete was also demonstrated in simple specimens with unidirectional reinforcement [2].…”

Section: Introductionmentioning

confidence: 96%

See 4 more Smart Citations

A Novel Structural Health Monitoring Method for Reinforced Concrete Bridge Decks Using Ultrasonic Guided Waves

et al. 2020

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This article presents the latest improvements in a recently developed nondestructive testing (NDT) approach for early detection of various flaws (corrosion, delamination, and concrete cracking) in reinforced concrete (RC) bridge decks. The proposed method involves the use of internal steel reinforcement as a wave guide for transmitting ultrasonic waves through the system and the measurement of leaked energy from the surface of the concrete. This paper builds upon the progress made in the previously published phases of the project and aims to further explore the capabilities and practicality of the proposed NDT method. Specifically, the limits of propagation distance, effect of bidirectional reinforcement, methods of attachment and coupling of the sensors to the reinforcement and concrete, and suggestions for optimal sensor arrays are discussed in this paper based on the findings from the most recent laboratory tests and pilot field tests. The results show that with careful placement of sensors and data interpretation, early stages of localized corrosion and delamination can be detected, even when bidirectional and multiple layers of reinforcement are present. For field applications, an angled seat made of fast-setting Hydrocal gypsum cement is recommended, and it is projected that the optimal angle of attachment is 33 degrees or less from the vertical axis.

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Section: Background and Motivationmentioning

confidence: 99%

Section: Objectivesmentioning

confidence: 99%

Section: Setup For the Laboratory Experimentsmentioning

confidence: 99%

Section: Specimen Setmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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A Novel Structural Health Monitoring Method for Reinforced Concrete Bridge Decks Using Ultrasonic Guided Waves

et al. 2020

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Early Age Concrete Strength Monitoring Using Power Spectral Density and Wavelet Packet Analysis

Xia

Yang

et al. 2020

Advances in Civil Engineering

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Concrete is a complex building material. Under normal curing conditions, concrete strength shows a nonlinear development process at an early age (1∼28 d). In the first few days after the completion of pouring, the strength of concrete increases slowly. Subsequently, the strength of concrete increases rapidly, reaching about 90% of its age strength. Finally, its strength gradually stabilizes. This paper introduces the experiment of 28-day concrete age strength monitoring based on embedded piezoelectric smart aggregate (SA). Two piezoelectric SAs were embedded in a concrete-filled GFRP (glass fiber reinforced polymer) tube column, one of which emitted a sinusoidal sweep signal and the other SA received the signal. With the hydration reaction of concrete, the stress wave would be significantly different when passing through concrete, and the received signal is changing constantly. Through power spectral density and wavelet packet energy analysis, the monitoring signal of concrete age within 28 days was analyzed. The experimental results show that the wavelet packet energy and power spectral density of the sensor monitoring signal show a nonlinear growth trend with time during the concrete target age. It can be divided into three stages, and the fifth day and the fourteenth day are the demarcation point of energy growth. And the trend of energy change corresponds well with the change of actual concrete strength and age. Comparing and analyzing the received signal energy of the sensor and the power spectral density function of the stress wave signal of the concrete specimen, the trend of the amplitude in the natural frequency domain is found to be the same in the three stages.

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A Comparison between Ultrasonic Guided Wave Leakage and Half-Cell Potential Methods in Detection of Corrosion in Reinforced Concrete Decks

Amiri

Erdogmus

Richter-Egger

2021

Signals

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This article presents the advantages and limitations of a recently developed Ultrasonic Guided Wave Leakage (UGWL) method in comparison to the well-known Half-Cell Potential (HCP) method in their ability to detect corrosion in reinforced concrete (RC) bridge decks. This research also establishes a correlation between UGWL data and chloride content in concrete RC slabs. Concrete slabs submerged in a 10% NaCl solution were monitored using both methods over a period of six months. The chloride content from the three cores (0.84, 0.55, and 0.18%) extracted from the slab after the 6-month long process all exceeded the chloride threshold values suggested in ACI 318, which is 0.05 to 0.1% by weight of concrete. Further, the UGWL method detected changes due to corrosion approximately 21 days earlier than the HCP method.

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Detecting Onset of Different Types of Flaws in Reinforced Concrete

Cited by 3 publications

References 3 publications

A Novel Structural Health Monitoring Method for Reinforced Concrete Bridge Decks Using Ultrasonic Guided Waves

A Novel Structural Health Monitoring Method for Reinforced Concrete Bridge Decks Using Ultrasonic Guided Waves

Early Age Concrete Strength Monitoring Using Power Spectral Density and Wavelet Packet Analysis

A Comparison between Ultrasonic Guided Wave Leakage and Half-Cell Potential Methods in Detection of Corrosion in Reinforced Concrete Decks

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