Question: =+19. In the article X-Ray Computed Tomography and Nondestructive Evaluation of Clogging in Porous Concrete Field Samples (J. of Materials in Civil Engr., 2012: 11031109),

=+19. In the article “X-Ray Computed Tomography and Nondestructive Evaluation of Clogging in Porous Concrete Field Samples” (J. of Materials in Civil Engr., 2012: 1103–1109), investigators determined the clogging percentage in porous concrete samples cored from parking lots. Porosity profiles using computed tomography scanned images were used in this study.

The following represent the average porosity (%) using a gravimetric method for nine concrete cores:

8.10 20.50 26.54 19.68 14.87 14.36 9.19 23.55 22.27

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