期刊
BETON- UND STAHLBETONBAU
卷 107, 期 12, 页码 805-815出版社
ERNST & SOHN
DOI: 10.1002/best.201200049
关键词
60 degrees C-Betonversuch; AKR; Alkalikieselsaurereaktion; Baustoffe; Betonfahrbahndecke; Computertomografie; Dauerhaftigkeit; Dehnungsmessung; Lebensdauer; Messsysteme; Mikrorisse; Nebelkammerlagerung; Rissbildung; Schallemissionsanalyse; Ultraschallmessung; 60 degrees C concrete prism test; acoustic emission analysis; alkali-silica-reaction; ASR; concrete motorway pavement; expansion measurement; fog chamber; microcracks; ultrasonic measurement; X-ray 3D computed tomography; Baustoffe; Versuche; Korrosion
Analysis of ASR-induced damage processes in concrete Application of innovative measurement techniques The alkali-reactive potential of aggregates is assessed according to the German guidelines by two different test methods. These are the 40 degrees C fog chamber storage and as an alternative method the 60 degrees C concrete prism test. In both tests, the discontinuously measured expansion of ASR-generating stored concrete prisms is used as criterion for the internal damage process. The damage analysis of the cubes additionally stored in the 40 degrees C fog chamber is also restricted to the discontinuous measurement of the crack width on the cubes surfaces. This paper describes an innovative, already successfully applied, non-destructive measurement methodology. This methodology enables a continuous monitoring of the internal damage processes in ASR-generating stored concrete specimens due to a continuous recording of expansion, acoustic emission and ultrasonic velocity. Thereby, three sequent phases of internal structural changes dominated by hydration, crack formation and filling of the cracks with ASR-gel and/or other reaction products can be detected. The crack formation was temporally and spatially visualised by discontinuously applied X-ray computed tomography measurements. Microscopic analyses confirm the findings of the X-ray 3D-CT.
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