Materials selection for concrete overlays : the final report Page: 72
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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Figure 4.12. Shotblasting in progress
Shotblasting was much easier to operate and provided an even wear on surface without
eroding the coarse aggregates. The only problem was that in using the unit with so much
confinement by the narrow slab, the steel shot kept spilling out from the recirculating stream,
requiring constant refilling of the equipment. This also may have been due to the deterioration of
the equipment seals caused by age.
After shotblasting was finished, a Circular Track Meter (CT Meter) was used to measure
the depth and consistency of the surface texture profile as shown in Figure 4.13. This test
procedure is presented in ASTM E2157 - 09 "Standard Test Method for Measuring Pavement
Macrotexture Properties Using the Circular Track Meter." The CT Meter uses a laser to measure
the profile of a circle 11.2 in. in diameter or 35 in. in circumference. The profile is divided into
eight segments of 4.4 in. The average mean profile depth (MPD) is determined for each segment
of the circle. The reported MPD is the average of all eight segment depths. The test was run at
different locations in order to find an average MPD of all the areas tested. The data collected
was then put through computer software called "C.T.Meter" that produces a plot and MPD.
MPD found using a CT Meter is highly correlated to mean texture depth (MTD), which is a
measurement of the depth of the prepared surface texture. Figure 4.14 shows a plot of test
results that were performed at five different locations (shown by five different colored graphs).
The letters on the top represents the eight segments of the circle, and the numbers on the left
represents the profile depth. As shown, the graphs are consistent to each other with an exception
to a peak at Segment F. This means that the surface texture is mainly consistent except in a
small area.72
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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/m1/92/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.