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Extra resources for Acoustic Emission: Standards and Technology Update (ASTM Special Technical Publication, 1353)

Sample text

A I C [- Two directional displacement transducer for sllp length Displacement transducer for crack width mm AE Sensor FIG. 3-Configuration o f the repaired RC beams and the locations o f displacement lransduce~ and AE sensors. YUYAMA ET AL. ON REINFORCED CONCRETE BEAMS 100 •'`''i''''l'``'i`'''•`'''I'''`••'''i•''••''''I''•`•''•`n'''•''''I''''•'`''l''''•','`i•''•''''t .... MAIN CRACK INITIATION SLIP L A R G E - S C A L E I ,. , . 9 v 5o 9 .. ;. .............. . . . . . . . . 5~ l z 6 '"' '"' '"' '"' "" "" '"' '"' "" "" "" '"' "" '"' "" ""1'"'1'" I 3 0 0 0 TIME I ' 0 6000 (SECOND) FIG.

25 mm. The moment tensor analysis found that the shear cracks 27 28 ACOUSTIC EMISSION: STANDARDS AND TECHNOLOGY generated near the reinforcing bar is responsible fl)r this activity. "lhe origin ,,i the~ emissions was attributed to rubbings between the faces of the existing cracks or ttiction between the reinforcement and concrete. Case Study 2: Repaired RC Beams The configuration of the specimen and the locations of displacement transducers and AE sensors are shown in Fig. 3. Six PAC R15 sensors were placed lineally on the top plane of the specimen.

New modem analysis for AE signal processing and imaging, and analysis of time series on the basis of stochastic dynamic models, should be provided for successful standardization of the AE testing of concrete and concrete structures. , "Quantitative Evaluation of Crack and Damage in Concrete by Acoustic Emission," Keynote Speech, Sixth International Symposium on Acoustic Emission from Composite Materials (AECM-6), San Antonio, TX, June 2-4, 1998. , "Evaluating the stability of Geologic Structures Using Acoustic Emission," ASTM-STP 571, 1975, pp.

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