Using impact-echo and impulse response methods to investigate the void in substrate
碩士 === 朝陽科技大學 === 營建工程系碩士班 === 96 === The present study uses impulse response and impact-echo methods to investigate the void in substrate. The experimental variables include different materials and support condition. There are two plate-like specimens. One is concrete plate with size 630cm*180cm*20...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2008
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/86694899880109213458 |
| Summary: | 碩士 === 朝陽科技大學 === 營建工程系碩士班 === 96 === The present study uses impulse response and impact-echo
methods to investigate the void in substrate. The experimental
variables include different materials and support condition. There are
two plate-like specimens. One is concrete plate with size
630cm*180cm*20cm. The other is asphalt plate with the same size.
The investigation shows the stiffness calculated from the initial
slop of the mobility curve obtained by impulse response and the
thickness amplitude in the simulated transfer function obtained from
the impact-echo test are related to the change in depth, quality and
status of support. The average mobility value of 200-700Hz showed
the presence of crack and honeycombing within plate. The cavities
beneath the concrete pavement can be effectively identified by the
peak/average amplitude ratio. For AC specimen, because cold joints
may be formed between separate pouring layer, the void in substrate
at the section with internal cold joint can not be identified by the
impact-echo method but can be identified by the impulse response
metod.
|
|---|