Materials selection for concrete overlays : the final report Page: 51
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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Station
Figure 3.15: Average crack spacing by station
The plot shows that almost all of the average crack spacings are between 5 and 10 ft. This
is a normal pattern for CRCP sections. In regards to distress, five punchouts and two spalls were
found. Besides the punchouts, there were several areas that had the potential for developing into
punchouts, given the pattern and proximity of the cracks. On the other hand, there were many
cracks that appear in very good shape. The pictures in Appendix A-8 show all of the punchouts
along with some areas with potential for developing punchouts, as well as some stretches in
excellent condition.
There is a segment of the project that has been textured with diamond grinding. This
segment is about 500 ft. long, and within it there is an area where a few traffic-counting loops
have been installed. Notice the exposed limestone aggregate in the diamond-ground segment,
particularly in Pictures 11 and 12. All these features are also illustrated in the Appendix A-8.
3.13.3 Previous Condition Surveys
Two previous surveys were conducted on this pavement in its initial life stages [35].
These surveys, along with the current one, present the opportunity to observe the deterioration of
the pavement over time, by analyzing the crack patterns, and the appearance of distresses.
Shortly after the whitetopping section was opened to traffic, on February 8, 2002 a
condition survey was conducted on the outside lane of the section. On that occasion, the average
crack spacing was found to be 12.2 ft. Most of the crack spacings were close to the mean, i.e.,
between 10 and 14 ft., thus, there was not much variability, as confirmed by the standard
deviation of 1.3 ft. The low coefficient of variation (11.4%) also characterizes the crack spacing
distribution closeness to the mean.
In May 2003, a new condition survey was conducted. As expected, a few more cracks
appeared after the previous survey. Nonetheless, the results continued to be excellent; the mean
crack spacing was 9.2 ft., the standard deviation was 1.3 ft., and the coefficient of variation was
14.6%. Figure 3.16 illustrates the cumulative frequency distributions obtained in the three
surveys. No distress was found during the previous two surveys.51
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Kim, Dong H.; Fowler, David W.; Ferron, Raissa P.; Trevino, Manuel M. & Whitney, David P. Materials selection for concrete overlays : the final report, report, July 2012; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth303706/m1/71/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.