Study of propagation of ultrasonic pulses in concrete exposed at high temperatures

Dias, Alisson Rodrigues de Oliveira; Amâncio, Felipe Alves; Rafael, Maria Fabíola de Carvalho; Cabral, Antônio Eduardo Bezerra

doi:10.1016/j.prostr.2018.11.012

Cited by 14 publications

(3 citation statements)

References 16 publications

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“…Based on our results, the two ultrasonic parameters of the main frequency and the amplitude of the concrete specimens after exposure to different temperatures are somehow similar, indicating that these two types parameters are unsuitable for evaluating and analysing the performance changes of concrete after exposure to high temperature. This is consistent with the conclusions of the relevant research [32,40,41]. In addition, as it can be seen from Figure 7, the strength loss rate of the NC after treatment at 1000 • C is 88.5%, while the LC-100 shows a strength loss rate of 71.7%, after experiencing a high temperature of 1000 • C. The reason is that the performance of shale ceramsite changes slightly, after exposure to high temperature and the strength loss of the lightweight aggregate concrete is mainly caused by high temperature damage of the cement gel.…”

Section: = /supporting

confidence: 94%

Section: Internal Damage After Exposure To High Temperaturesupporting

confidence: 93%

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Performance Degradation and Microscopic Analysis of Lightweight Aggregate Concrete after Exposure to High Temperature

2020

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This study analyses the deterioration of mechanical properties in lightweight concrete after exposure to room temperature (20 °C) and high temperature, i.e., up to 1000 °C, including changes in visual appearance, loss of mass, and compressive strength. All-lightweight shale ceramsite aggregate concrete (ALWAC) and semi-lightweight shale ceramsite aggregate concrete (SLWAC) are prepared using an absolute volume method to analyse the relationships between relative ultrasonic pulse velocity, loss rate of compressive strength, damage degree, and temperature levels. Our results show that, under high temperature, the lightweight aggregate ceramsite concrete performs better compared to normal concrete. After exposure to 1000 °C, the ALWAC shows a strength loss of no more than 80%, while the normal concrete loses its bearing capacity, with a similar strength loss as the SLWAC. Furthermore, the relative ultrasonic pulse velocity and damage degree are used to evaluate the effects of high temperature on the concretes, including the voids and cracks on the surface and inside of the specimens, which induces the deterioration of mechanical properties and contributes to the thermal decomposition of the cementing system and the loss of cohesion at the aggregate interface. Based on internal structure analyses, the results from this study confirm that the lightweight aggregate concrete shows a high residual compressive strength after exposure to the high temperature.

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Section: = /supporting

confidence: 94%

Section: Internal Damage After Exposure To High Temperaturesupporting

confidence: 93%

Performance Degradation and Microscopic Analysis of Lightweight Aggregate Concrete after Exposure to High Temperature

2020

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“…According to Hassan and Jones [9], the UPV test is the most reliable, easy, and portable non-destructive method for evaluating materials' elastic properties. UPV test results have been effectively used to investigate the properties of rubberized concrete [10,11], lightweight concrete [12,13], fly ash self-compacting concrete [14], concrete containing ground granulated blast furnace slag [15], concrete at high temperature [16], and concrete with frost influence [17]. The high sensitivity of the UPV method makes it possible to detect discontinuities in deep elements and extremely small discontinuities.…”

Section: Introductionmentioning

confidence: 99%

Destructive and Non-Destructive Evaluation of Fibre-Reinforced Concrete: A Comprehensive Study of Mechanical Properties

2022

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Ultrasonic pulse velocity (UPV) and rebound hammer tests are accepted as alternatives to destructive testing to determine the compressive strength, dynamic modulus of elasticity, and Poisson’s ratio, which are needed for structural design. Although much work has been conducted for plain concrete, the research data for fibre-reinforced concrete (FRC) is insufficient. In this regard, this study explains the correlations between compressive strength, rebound hammer, and UPV tests for plain concrete and FRC contains 0.25%, 0.50%, and 1.00% of 30 mm and 50 mm long steel fibres. A total of 78 concrete cube and beam specimens were tested by direct, semi-direct, and indirect UPV and rebound hammer test methods. The study found that the rebound hammer test is more suitable for measuring the compressive strength of matured FRC than young concrete. The UPV test revealed that the volume fraction does not, but the length of steel fibres does affect the UPV results by the direct test method. The UPV direct method has the highest velocity, approximately two times the indirect velocity in FRC. UPV measurements can be effectively used to determine the dynamic modulus of elasticity and Poisson’s ratio of FRC. The dynamic elastic modulus increases while the Poisson’s ratio decreases for the same steel fibre length when at increasing FRC fibre content. The results of this study will be significant for non-destructive evaluations of FRC, while additional recommendations for future studies are presented at the end of the paper.

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Deep learning model for estimating the mechanical properties of concrete containing silica fume exposed to high temperatures

Tanyıldızı

Şengür

Akbulut

et al. 2020

Front. Struct. Civ. Eng.

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Study of propagation of ultrasonic pulses in concrete exposed at high temperatures

Cited by 14 publications

References 16 publications

Performance Degradation and Microscopic Analysis of Lightweight Aggregate Concrete after Exposure to High Temperature

Performance Degradation and Microscopic Analysis of Lightweight Aggregate Concrete after Exposure to High Temperature

Destructive and Non-Destructive Evaluation of Fibre-Reinforced Concrete: A Comprehensive Study of Mechanical Properties

Deep learning model for estimating the mechanical properties of concrete containing silica fume exposed to high temperatures

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