Automated Identification of Compression-Induced Cracking in Cement Paste

by David Darwin, Univ of Kansas, Lawrence, United States,
Kirk W. Ketcham, Univ of Kansas, Lawrence, United States,
Francisco A. Romero, Univ of Kansas, Lawrence, United States,
Jeffrey L. Martin, Univ of Kansas, Lawrence, United States,



Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract:

The development of image analysis techniques to identify cracks using scanning electron microscope images of hydrated cement paste is described. Cracks are identified based on both the gradient and the absolute value of the gray level of the back-scattered electron image and the geometric properties of the features identified. The procedures are designed for use with polished epoxy-impregnated specimens. The procedures allow for high-speed, objective crack identification that is not affected by operator interpretation or fatigue. The technique offers the capability of surveying large areas within the test specimens to obtain a full understanding of the extent and nature of cracking obtained due to loading.

Subject Headings: Cracking | Cement | Load tests | Compression tests | Automatic identification systems | Material tests | Hydration

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