Figure 2
The horizontal axis of the line graph is labeled “Age in d” and the vertical axis is labeled “Compressive strength in megapascals.” The vertical axis ranges from 30 to 70 in increments of 10. The horizontal axis ranges from 0 to 112 with markings at 28, 56, 84, and 112. Two lines are shown on the graph. The first line, in orange, is labeled “Rebound method,” and the second line, in gray, is labeled “100 millimeters core sample,” as indicated by the legend at the top. Nature of the curves are as follows: The “Rebound method” starts at (13.5, 41.5), increases with a positive slope to (28, 45.8), and continues to (56, 52.6). It continues to move upward with a smaller slope and ends at (90, 56). The “100 millimeters core sample” starts at (28, 55), increases with a positive slope to (55.7, 59.6), and ends at (90, 64.5). Note: All numerical values are approximated.Comparison of strength between the rebound method and the core drilling method for concrete models. Source(s): Author’s own work