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Cite this document
The major objective of this investigation was to observe directly the formation or propagation of microcracks in concrete by use of the scanning electron microscope both before and after application of compressive stress fields.
Concrete, under compression, fails when macrocracks have propagated to the extent that the concrete will not support the applied loads. Many investigators have implied that the failure mechanism of concrete is related to internal microcracking. However, due to the limitations in the techniques employed, the detection of microcracks was somewhat uncertain.
Microcracks were found to exist in concrete prior to application of compressive stress fields in the form of shirnkage microcracks (initial bond microcracks). As the compressive stress field is increased, these microcracks widen and propagate until failure occurs.
composite materials, bond microcrack, concretes, failure, fatigue (materials), matrix microcrack, microcrack, scanning electron microscope, shrinkage, shrinkage microcrack
Assistant Professor, University of Maryland, College Park, Md.