Effectiveness Of Ultrasonic Pulse Velocity And Impact- Echo Ndt Techniques To Assess The Quality Of Concrete
The deterioration of concrete in structure is a result of several internal or external degradation mechanism and which results in distress of the structure i.e. decrease in strength and integrity of the structure. The state of distress is often hidden from view and is only evident at a stage wher...
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| 主要作者: | |
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| 格式: | Thesis |
| 語言: | English English |
| 出版: |
2002
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| 主題: | |
| 在線閱讀: | http://psasir.upm.edu.my/id/eprint/12131/1/FK_2002_82.pdf |
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| 總結: | The deterioration of concrete in structure is a result of several internal or
external degradation mechanism and which results in distress of the structure i.e.
decrease in strength and integrity of the structure. The state of distress is often
hidden from view and is only evident at a stage where there is significant reduction
in strength of the structure. Defects are often introduced during construction and are
viewed during in-service life. Some deterioration is viewed physically in the early
age or during the service life of the structure in terms of spalling, surface crack,
swelling and honeycombing. This deterioration collectively or individually results in
reducing the load carrying capacity in terms of the distress of the structure.
In this project, the common defects in the concrete structures and mapping
techniques by nondestructive test are presented. Among the various techniques of the
nondestructive tests, the Ultrasonic Pulse Velocity (UPV) and DOCtor's Impactecho
were chosen for their effectiveness. The UPV is used to estimate the concrete
strength, detecting flaws such as voids and cracks and also to investigate the effects
of smaller diameter bar in the concrete. In detecting various sizes of voids by the Impact-echo test techniques a format was suggested to identify them from the
frequency spectrum. |
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