Classification and inspection of reinforced concrete elements for use in retaining walls using ultrasound tests

Silva, Rodrigo Rogerio Cerqueira da; Gonçalves, Raquel; Pedroso, Cinthya Bertoldo

doi:10.1016/j.conbuildmat.2020.120010

Cited by 3 publications

(4 citation statements)

References 30 publications

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“…Also as expected, there was an increase in slump (NM 67, 1998) as the watercement factor increased (Table 2). Despite the variations, the values for all densities are within the limits considered normal for concrete, from 2000 kg.m -3 to 2800 kg.m -3 , according to the Brazilian standard (ABNT-NBR 9778, 2015) and the literature (Silva, et al, 2020). The sample for each w/c ratio consisted of 48 cylindrical specimens (100 x 200 mm) made in accordance with ABNT-NBR 5738 ( 2003) and 16 prismatic specimens (200 x 200 x 400) mm, using CPII-F-32 cement, commonly used in construction.…”

Section: Experimental Programmentioning

confidence: 63%

“…According to Silva (2020), the ultrasonic velocities obtained from indirect measurements are lower than the velocity obtained from direct measurements, due to the measurement being carried out close to the surface of the concrete, which generally has a different composition to the internal concrete.…”

Section: Effect Of Temperature On the Resistance Rigidity And Propaga...mentioning

confidence: 99%

“…Researchers have used ultrasound testing to create correlation models to predict the relationship between ultrasound wave propagation and other physical-mechanical characteristics. However, care must be taken when using correlation curves, as there are several factors that can interfere with the results, such as strength (Silva, 2020), modulus of elasticity (Trtnik et al, 2008;Yıldrım andŞengul, 2011), density (Mohammed andHasan, 2016), porosity (Lafhaj et al, 2006) and permeability (Panzera et al, 2008). In addition, the properties of the water-cement ratio (Ye et al, 2011;Silva, 2020), aggregate size (Berriman et al, 2005), hydration process (Zhang, et al, 2009), and curing conditions chamber et al (2019).…”

Section: Introductionmentioning

confidence: 99%

“…However, care must be taken when using correlation curves, as there are several factors that can interfere with the results, such as strength (Silva, 2020), modulus of elasticity (Trtnik et al, 2008;Yıldrım andŞengul, 2011), density (Mohammed andHasan, 2016), porosity (Lafhaj et al, 2006) and permeability (Panzera et al, 2008). In addition, the properties of the water-cement ratio (Ye et al, 2011;Silva, 2020), aggregate size (Berriman et al, 2005), hydration process (Zhang, et al, 2009), and curing conditions chamber et al (2019). In addition to the state of stress that affects the speed of propagation of ultrasonic waves, this phenomenon is called acoustoelasticity (Lillamand et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Determinação da resistência e rigidez de concreto após simulação de incêndio através de modelos de regressão múltiplos entre propagação de ondas e temperatura

Silva,

Gomes

2024

Revista de la Asociación Latinoamericana de Control de Calidad,

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O objetivo dessa pesquisa foi avaliar o comportamento dos parâmetros físicos, mecânicos e elásticos de concretos confeccionados com diferente relação água/cimento, submetidos a diferentes patamares de temperaturas, através da propagação de ondas ultrassônicas. Após exposição a elevadas temperaturas, amostras de concretos cilíndricas e prismáticas foram submetidas ao resfriamento tipo lento e brusco, demonstrando a influência do tipo de resfriamento na resistência à compressão, módulo de elasticidade, perda de massa e velocidade de propagação de ondas. Foram desenvolvidos modelos de regressão múltiplos estatisticamente significativos, ao nível de 95% de confiança, como preditores de resistência e rigidez do concreto, através das velocidades obtidas pelo ensaio de ultrassom, permitindo realizar o monitoramento e a verificação da integridade de estruturas após situações de incêndio.

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Section: Experimental Programmentioning

confidence: 63%

Section: Effect Of Temperature On the Resistance Rigidity And Propaga...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determinação da resistência e rigidez de concreto após simulação de incêndio através de modelos de regressão múltiplos entre propagação de ondas e temperatura

Silva,

Gomes

2024

Revista de la Asociación Latinoamericana de Control de Calidad,

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Mechanical Properties of Concrete Produced with Coarse Aggregates from Different Mineralogical Origins Using Ultrasonic Tests

da Silva,

Gonçalves,

Bertoldo

2023

Int J Concr Struct Mater

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The use of nondestructive techniques in the technological control of concrete allows to evaluate and monitor the condition of the material without interfering with its properties; therefore, it is highly desirable in on-site inspections. Among these techniques, ultrasonic testing stands out as one of the most promising by its speed and simplicity to obtain results. However, inferences of strength and stiffness properties using ultrasound parameters should be made with caution, since many factors may interfere with wave propagation. This research aimed to evaluate the behavior of parameters obtained by ultrasonic testing (velocity of wave propagation [V] and stiffness coefficient [C = density × V2]) as predictors of the strength (fc) and stiffness (Eci) of concrete produced with coarse aggregates from different mineralogical origins. To achieve the objective, 128 specimens were produced with four aggregate mineralogical origins and four water-cement ratios, with 8 replications each. The ultrasonic tests were performed with two-frequency transducers (45 and 80 kHz). Prediction models of fc and Eci were statistically significant (P-value < 0,05) for both frequencies. The model using [C] as independent variable present better correlation with Eci (R2 > 91,2%) and with fc (R2 > 82%) than the model using only [V]. General regression models (regardless of the gravel type) were also statistically significant (P-value < 0.05), with R2 > 79% and prediction errors higher than those obtained for the specific models for different rock types.

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Simulação de manifestações patológicas em parede diafragma através de propagação de ondas ultrassônicas

Silva

Pedroso

2022

Revista de la Asociación Latinoamericana de Control de Calidad,

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O objetivo dessa pesquisa foi simular manifestações patológicas em parede diafragma através de concretos produzidos com diferentes adições de polímero sintético, propondo obter modelos de predição de resistência e rigidez através de propagação de onda de ultrassom. Foram realizados ensaios de compressão para determinação da resistência e rigidez, assim como ensaios de ultrassom pelo método direto e indireto em concretos produzidos com diferentes concentrações de polímero sintético. Os resultados obtidos indicaram queda nas propriedades mecânicas e acústicas do concreto com o aumento da concentração de polímero sintético em sua confecção. Os modelos gerados pelo ensaio ultrassônico foram estatisticamente significativos, ao nível de confiança em 95%, podendo, as correlações estabelecidas em concreto, serem utilizadas na detecção de manifestações patológicas in loco.

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Classification and inspection of reinforced concrete elements for use in retaining walls using ultrasound tests

Cited by 3 publications

References 30 publications

Determinação da resistência e rigidez de concreto após simulação de incêndio através de modelos de regressão múltiplos entre propagação de ondas e temperatura

Determinação da resistência e rigidez de concreto após simulação de incêndio através de modelos de regressão múltiplos entre propagação de ondas e temperatura

Mechanical Properties of Concrete Produced with Coarse Aggregates from Different Mineralogical Origins Using Ultrasonic Tests

Simulação de manifestações patológicas em parede diafragma através de propagação de ondas ultrassônicas

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