Applications of the Scanning Electron Microscope to Concrete Failure (Axial, Biaxial, and Dynamic).
Final rept. 1 Sep 80-31 Aug 83,
STEVENS INST OF TECH HOBOKEN N J
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The major objective was to directly observe the formation andor propagation of microcracks in concrete plain and reinforced both before and after applications of axial, biaxial, and dynamic stress fields. As part of this objective procedures, techniques, apparatus, and equipment were developed andor modified for the study of concrete fracture utilizing the Scanning Electron Microscope SEM. In addition, information regarding microcracks, propagation of these microcracks concrete failure, aggregate shape, plain and reinforced concrete, the sum effect of various stress fields, and the ultimate strength of concrete was found. Information regarding microcracks, aggregate shape, plain and reinforced concrete, the sum effects of various stress fields, and the ultimate strength of concrete was found for concrete containing blended cements. Concrete may fail from applied service loads or applied stress fields whether they are axial, biaxial, or dynamic. Also, concrete may fail as a result of volume changes such as the hydration of the cement paste leading to the shrinkage microcracks or to various cycles of wetting and drying or temperature variations freezing and thawing. Thus, a model previously developed was investigated and the equations developed were found to be appropriate.
- Ceramics, Refractories and Glass