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- W623776851 abstract "ABSTRACT The stress-dependency of surface wave velocities in concrete is investigated in an experimental study. The propagation velocities of sonic surface waves were measured in concrete specimens subjected to cycles of uniaxial compression. The surface wave velocity was found to be highly sensitive to the level and direction of stress in the concrete specimens. The external pressure results in the closure of microcracks (with normals parallel to the direction of loading) resulting in a gradual increase in surface wave velocities measured parallel to the loading axis. At higher stress levels, the microcracks (with normals parallel to the direction of loading) widen, join together and new microcracks are formed, a process, which was captured by a non-contact optical deformation measurement system.. This leads firstly to the flattening and eventually a drop in the velocity-stress curves, especially those measured perpendicular to the loading direction. Measuring the velocities during both the loading and unloading phases of load cycles made it possible to distinguish the effects of stress (i.e. the closure of microcracks) and damage (i.e. widening, coalescence, and formation of microcracks) on the measured velocities. Measuring the surface wave velocities in concrete under multiple loading cycles, it was found that the surface wave velocity measurements show a stress-memory effect. This effect was found to be in a good agreement with the Kaiser effect." @default.
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- W623776851 date "2010-01-01" @default.
- W623776851 modified "2023-09-23" @default.
- W623776851 title "Macro-effect of Microcracks on Sonic Surface Wave Velocity in Concrete Under Compression" @default.
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