Healing and simultaneous ultrasonic monitoring of cracks in concrete

Kaur, Nimrat Pal; Shah, Jay Kumar; Majhi, Subhra; Mukherjee, Abhijit

doi:10.1016/j.mtcomm.2018.10.022

Cited by 36 publications

(9 citation statements)

References 51 publications

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“…For example, in [26], investigated small cracks under environmental changes. In [27], presented the efficacy of the ultrasonic technique in discerning healing from its failure. In [28], studied real crack and influence on the diffusion parameters (degradation of the signal scattered from structural deformation).…”

Section: Introductionmentioning

confidence: 99%

Early Crack Detection of Reinforced Concrete Structure Using Embedded Sensors

Chakraborty

Katunin

Klikowicz

et al. 2019

Sensors

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The damage in reinforced concrete (RC) structures can be induced either by the dynamic or static load. The inspection technologies available today have difficulty in detecting slowly progressive, locally limited damage, especially in hard-to-reach areas in the superstructure. The four-point bending test on the benchmark RC structure was used as a test of the quality and sensitivity of the embedded sensors. It allowed assessment of whether any cracking and propagation that occurs with the embedded sensors can be detected. Various methods are used for the analysis of the ultrasonic signals. By determining the feature from the ultrasonic signals, the changes in the whole structure are evaluated. The structural degradation of the RC benchmark structure was tested using various non-destructive testing methods to obtain a comprehensive decision about structural condition. It is shown that the ultrasonic sensors can detect a crack with a probability of detection of 100%, also before it is visible by the naked eye and other techniques, even if the damage is not in the direct path of the ultrasonic wave. The obtained results confirmed that early crack detection is possible using the developed methodology based on embedded and external sensors and advanced signal processing.

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Section: Introductionmentioning

confidence: 99%

Early Crack Detection of Reinforced Concrete Structure Using Embedded Sensors

Chakraborty

Katunin

Klikowicz

et al. 2019

Sensors

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“…To prevent ultrasonic energy reduction, a gel-like material should be used between the device probes and concrete surface. In addition, this test works best on a smooth surface without concrete pores (Kaur et al 2019). In the ultrasonic test, a high ultrasonic wave velocity represents high concrete quality, while a low ultrasonic wave velocity implies low concrete quality.…”

Section: Methodsmentioning

confidence: 97%

A Feasibility Study on Production of Concrete Blocks Using Treated Municipal Solid Waste Leachate

Esmaeili

Heidarzadeh

2021

Preprint

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Population growth and development have increased the need for drinking water all over the world. Hence, it is required to find an alternative to water in different industries. Concrete represents a remarkable water-consuming industry. The present study investigates whether the treated leachate of municipal landfills can be employed as a substitute for water in the concrete mixing scheme. For this purpose, concrete samples fabricated at different concentrations of treated leachates were compared to the control sample containing distilled water in terms of unconfined compressive strength (UCS) at the ages of 7 and 28 days. The experimental results revealed treated leachate accelerated the cement setting time by nearly 15 min and increased concrete slumping by 16%. The complete replacement of distilled water with treated leachate decreased UCS by 25% (from 50 to 38 MPa). The scanning electron microscope (SEM) and ultrasonic results showed that a rise in the treated leachate content of concrete increased porosity. Increased porosity would reduce UCS. The presence of heavy metals and leaching from the cement matrix are important characteristics of leachates. The toxicity characteristic leaching procedure (TCLP) revealed that the leaching of heavy metals in all the samples was in the acceptable range.

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“…The change of ultrasonic wave can reflect the internal defects a concrete specimen [25,26]. Tektronix AFG3022B arbitrary waveform generator and Tektronix TDS1002B-SC was used as the digital oscilloscope in this testing.…”

Section: Ultrasonic Testingmentioning

confidence: 99%

Effect of Graphene and Carbon Fiber on Repairing Crack of Concrete by Electrodeposition

Yang¹

2019

Ceramics - Silikaty

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For many years, researches have investigated concrete repair technologies including epoxy resin injection technology, bioremediation technology and self-healing technology. However, these repair methods have proven to be expensive and cumbersome to be carry out. A more recent technology electrochemical deposition, the focus of this paper emphases in a new way of healing concrete cracks that restores durability and mechanical strength of a concrete structure. Therefore, the emphasis of the research work reported here in is to prove the repair efficiency of the electrodeposition method by adding carbon fiber and graphene to the concrete. By analyzing the mass change of the concrete, total charge passed, crack width variation, ultrasonic waves, sediment composition and morphology, it was found that the cracks with width of 0.3-0.5 mm in samples healed within 20 days. The repair efficiency of samples mixed with carbon fiber and graphene were better than specimens without carbon fiber and graphene. Moreover, the mass increase rate of a concrete samples mixed with carbon fiber and graphene was 10.15 ‰, which is twice the mass of conventional concrete. The results of SEM and X-ray diffraction analysis showed that the samples mixed with carbon fiber and graphene produced more ZnO and that had a continuous compact structure.

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Healing and simultaneous ultrasonic monitoring of cracks in concrete

Cited by 36 publications

References 51 publications

Early Crack Detection of Reinforced Concrete Structure Using Embedded Sensors

Early Crack Detection of Reinforced Concrete Structure Using Embedded Sensors

A Feasibility Study on Production of Concrete Blocks Using Treated Municipal Solid Waste Leachate

Effect of Graphene and Carbon Fiber on Repairing Crack of Concrete by Electrodeposition

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