By Sotirios J. Vahaviolos
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Additional resources for Acoustic Emission: Standards and Technology Update (ASTM Special Technical Publication, 1353)
ON REINFORCED CONCRETE BEAMS Case Study 3: RC Beams Deteriorated Due to Corrosion of Reinforcement Shown in Fig. 5 are dimensions (cm) of the specimen and sensor locations. Six PAC R6 (60 kHz resonant) sensors were attached on the specimen to perform the moment tensor analysis as well as AE parameter analysis. The lower quarter part of the specimen was immersed in a 3% sodium chloride solution and an anodic current was galvano-statically charged to the main steel bars until the maximum width of surface cracks due to corrosion of the bars reached 1 mm or 4 mm.
3. Six PAC R15 sensors were placed lineally on the top plane of the specimen. The repaired part is in the tensile side of the specimen. The depth and length of the repaired part are 100 mm and 2200 mm, respectively. In addition to steel bars as reinforcement, stirrups were embedded in the specimen to prevent beams shear failure. The specimens were subjected to repeated four point bending loadings by a strain-control type machine. During each loading, measurements of AE, crack width, slip length between the repaired part and the original part, and strain of concrete and reinforcement were made by using AE sensors and two different types of displacement transducers.
It is anticipated that the field-monitoring program will yield information regarding the relative in-plane and outof-plane movements. Later, these results will be used to formulate laboratory and numerical studies. Computer Modeling and Static Testing Computer models of the old and new connection detail will be developed to determine the stress distribution in connection due to dead load and wind events. Other issues that may be significant are the method of assembly and the resulting residual HAMILTON ET AL.
Acoustic Emission: Standards and Technology Update (ASTM Special Technical Publication, 1353) by Sotirios J. Vahaviolos
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