Abstract
In the recent studies of concrete surface crack non-destructive test (NDT), the environmental factors are seldom to be taken into assessment consideration using Rayleigh wave (R-wave) propagation method. Dust, fine sand or water that accumulated in the concrete surface cracks might potentially affect the behaviour of R-wave when it propagated through the cracks. In this study, the effects of filling conditions in concrete surface crack to the properties of R-wave were examined. The targeted parameters that used for studying the behaviour of R-wave are the arrival time of R-wave and its corresponding amplitude. Numerical simulations were conducted for determining the changes of R-wave amplitudes and arrival time when it propagated through a concrete model with a surface crack which containing various filling conditions. Sand and charcoal powder were the materials used for filling the concrete cracks. The results of numerical simulations were then justified by experimental measurements. The comparison between the results of numerical simulation and experimental measurement generated a conclusion where R-wave arrival time and its corresponding amplitude is independent from the predefined filling conditions of concrete surface crack.
Highlights
These surface opening cracks often can be found from civil structures
This study focuses on two types of filling materials: fine charcoal powder and fine sand and water and aimed to investigate the effect of the proposed filling materials to the propagation of Rayleigh wave (R-wave)
It is reasonable to assume that, the filled crack will only (b) affect the properties of the simulated waveforms that recorded by sensor 3 (S3) and sensor 4 (S4)
Summary
These surface opening cracks often can be found from civil structures Causes of these cracks can be caused by many different natures: physical, chemicals, mechanical or due to concrete shrinkage during setting [1]. Need not be repaired will be more favorable [1] For this purpose, inspection is required for the defected concrete structures to assess their integrity and functionality in order to determine the level of necessity for remedial work to be conducted. Hevin et al [9] suggested that future perspectives are to broaden the method to the case of more realistic cracks (waterfilled cracks, cracks with mechanical contact between the two lips and etc.) This indicates the importance and necessity of conducting a behavioural study of surface Rwave propagated through the concrete medium with different surface crack filling conditions, in order to. Normal saltation event of sand will bring sand particles into the surface opening cracks of concrete structures
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