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Masonry
To facilitate sampling before and after winter, the patch was subdivided into two sections each about 35 ft in length. Researchers removed 25 cores from each side of one of the patch sections approximately one month after patch placement and then extracted the same number of cores from the second patch section in late April 2004. The second set of cores was analyzed to evaluate the effects of in-situ freeze-thaw cycling on the overall bond strength of each joint. As depicted in Figure 5, a portable 6-in. core drill was utilized for the extractions, in which each core was centered as closely as possible on the respective joint. After removal, the cores were prepared for testing at the Brigham Young University (BYU) Highway Materials Laboratory. Each specimen was trimmed using a masonry saw to create flat, parallel end faces and then air- dried to constant weight. The heights, weights, and diameters of the cores were then measured in order to calculate the bond area and density of each specimen. Photographs of typical cores from the saw-cut and scarified joints are given in Figure 6.

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