Concrete Surface Characterization Using Optical Metrologyby Nora C. Sassenfeld, Univ of Alabama in Huntsville, Huntsville, United States,
Michelle M. Crull, Univ of Alabama in Huntsville, Huntsville, United States,
Abstract: The displacement of the surface of a concrete specimen is measured as it cures using an optical method. This method, known as optical metrology, is one in which a line is projected onto the surface of the specimen and a Charge Injection Device (CID) camera is used to digitize the image of the surface. As the surface displaces the projected line moves and the displacement may be measured by correlating the displaced image to the initial image. Experimental results from two normal weight concrete mixes show that any displacement of the surface after 12 hours of curing is unmeasurable. The average strain over the length of each specimen is calculated and plotted against the time of cure at various points along the diameter of the specimen. Standard compression tests were also run on the mixes. The advantage of this method is that certain characteristics of the concrete, such as strain, can be calculated non-destructively within 12 hours. This technique may be adapted for use on structural members in place.
Subject Headings: Concrete | Imaging techniques | Displacement (mechanics) | Cameras | Strain | Compression tests | Materials characterization | Curing
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