Avaliação da capacidade de detecção de falhas no concreto através do ensaio ultrassônico

Lorenzi, Alexandre; Chies, Josué Argenta; Adamatti, Daniela Santini; Filho, Luiz Carlos Pinto Silva

doi:10.21041/ra.v7i3.127

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…The identification of discontinuities can be done either by checking the decrease in wave speed or the increase in the time the wave takes to travel through the concrete samples. The speed or travel time of the ultrasonic pulses vary because fissures and voids hinder the propagation of waves and, consequently, their arrival at the receiving transducer [24], [25].…”

Section: Ultrasonic Pulse Velocity Test (Upv)mentioning

confidence: 99%

Non-destructive tests for performance evaluation of self-healing concrete by addition of methyl methacrylate-containing microcapsules

Valerio

Fernandes

Futai

et al. 2024

Rev. IBRACON Estrut. Mater.

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The objective of this work was to develop a chemical admixture to make concrete capable to heal its fissures autonomously and, consequently, mitigate the concrete’s reinforcement corrosion due to the ingress of aggressive agents. For that, polymeric microcapsules built by a shell of urea-formaldehyde-melamine (UFM) and a core of methylmethacrylate were developed and added to the concrete to further evaluation. The concrete specimens containing 0%, 3% and 6% of the proposed microcapsules (mass of microcapsules / mass of cement) were subjected to destructive and non-destructive tests. The water absorption and the mechanical tests i.e., compressive strength and indirect tensile strength (Brazilian test) were carried out to characterize concrete, while the electrochemical impedance spectroscopy (EIS) and the non-destructive ultrasonic pulse velocity (UPV) tests were conducted to evaluate the concrete self-healing ability. These tests showed that the proposed admixture was able to heal the concrete’s fissures partially. In addition, it was concluded that the samples with 3% of microcapsules presented higher self-repairing rates. Despite the microcapsules developed in this work have presented a satisfactory self-healing efficiency, their effectiveness looks to be affected by the mixing procedure once part of them is broken during the process.

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Section: Ultrasonic Pulse Velocity Test (Upv)mentioning

confidence: 99%

Non-destructive tests for performance evaluation of self-healing concrete by addition of methyl methacrylate-containing microcapsules

Valerio

Fernandes

Futai

et al. 2024

Rev. IBRACON Estrut. Mater.

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“…The study shows that UPV tests are sensitive to variations in homogeneity and density, thus providing important data for making decisions about conditions of concrete structures. UPV testing could also contribute to the quality control of the concrete structures in conditions of use [11].…”

Section: Importance Of the Researchmentioning

confidence: 99%

Evaluation of mechanical damage in concrete subjected to uniaxial compression and tensile by diametrical compression with longitudinal and transverse ultrasonic waves

Araujo

Silva

Nogueira

et al. 2018

Rev. IBRACON Estrut. Mater.

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In the research program both longitudinal and transverse ultrasonic waves were applied to concrete specimens under uniaxial compression and tensile diametrical compression. A total of 45 concrete specimens with five (5) different mixes were loaded until failure. While load was being applied - in compression and split tension - ultrasonic pulses were recorded and velocities calculated for both shear and pressure waves. The results indicate that longitudinal or transverse ultrasonic waves can be applied in the evaluation of diffuse damage (microcracking in uniaxial compression) or concentrated damage (tensile microcracking by diametrical compression) imposed on the concrete mechanically through the application of loads.

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“…En la actualidad existen diversos ensayos no destructivos que permiten evaluar de forma rápida y eficaz el estado de una estructura, además de estimar sus propiedades mecánicas (Chang et al, 2003;McCann y Forde, 2001;Rehman et al, 2016). De los diversos métodos no destructivos disponibles (McCann y Forde, 2001), la Velocidad de Pulso de Ultrasónico (VPU) ha demostrado varias aplicaciones en hormigón (Aggelis et al, 2010;Lorenzi et al, 2017;, siendo empleada por más de 60 años para evaluar la calidad del hormigón (Kraub y Hariri, 2006). El ensayo se basa en la aplicación de la propagación de ondas ultrasónicas a través del hormigón, donde por medio de un transductor emisor y un receptor, la onda recorre el material; la velocidad se obtiene entre la división de la distancia de los transductores y el tiempo proporcionado por el equipo (Cánovas, 1988;Quispe, 2015).…”

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Estimación de la resistencia a la compresión del hormigón por medio del ensayo de Velocidad de Pulso Ultrasónico (VPU)

Chileno¹,

Moran-Velásquez²,

Rocha³

2021

Congreso Latino-Americano De Patología De Construcción

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El presente estudio tiene por objetivo estimar la resistencia a la compresión del hormigón mediante el ensayo de Velocidad de Pulso Ultrasónico (VPU). Se elaboraron 6 prismas de hormigón (20 cm x 20 cm x 25 cm) para dos resistencias a la compresión de diseño (fc'), 21 y 28 MPa, totalizando 12. Se aplicó el ensayo de VPU por transmisión indirecta a diferentes distancias (5 cm, 10 cm y 15 cm). Los resultados de VPU y de resistencia a la compresión de los prismas fueron analizados mediante regresiones lineales. Los modelos lineales de cada fc' por separado no son estadísticamente significativos; no obstante, el modelo que considera todos los datos (ambos fc') presenta un mejor ajuste.

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Avaliação da capacidade de detecção de falhas no concreto através do ensaio ultrassônico

Cited by 4 publications

References 1 publication

Non-destructive tests for performance evaluation of self-healing concrete by addition of methyl methacrylate-containing microcapsules

Non-destructive tests for performance evaluation of self-healing concrete by addition of methyl methacrylate-containing microcapsules

Evaluation of mechanical damage in concrete subjected to uniaxial compression and tensile by diametrical compression with longitudinal and transverse ultrasonic waves

Estimación de la resistencia a la compresión del hormigón por medio del ensayo de Velocidad de Pulso Ultrasónico (VPU)

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