Materials selection for concrete overlays : the final report Page: 45
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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Figure 3.13: Laying down burlaps
3.11.4 Conclusion
The overall paving operation was very satisfactory. The contractor was asked to fix and
adjust minor things, and he responded promptly. Surface preparation was thorough, the paving
machine provided enough concrete cover, and finishing and curing was done in a timely manner.
Additional construction photographs are provided in Appendix A-6.
3.12 Wichita Falls - US 281
On September 28, 2010, a field trip was made to visit the BCO section on US 281 in
Wichita Falls. The pavement of interest is a 4-in.-thick BCO constructed in 2002, on US 281.
The project section, approximately 3.3 miles long, is located between the Archer and Wichita
County line, and the Holliday Creek Bridge. The original 8-in.-thick CRCP structure was
constructed in 1969. In 2001, CTR conducted a study for the rehabilitation of that pavement,
which included surveys, FWD and RDD deflection tests, as well as core sampling. The study
concluded that the pavement was a good candidate for BCO rehabilitation, and the overlay was
designed as a 4-in.-thick layer, with limestone coarse aggregates, steel mat reinforcement, and
shotblasting as the surface preparation procedure. The overlay was constructed during June and
July of 2002.
3.12.1 Condition Survey
The survey consisted of a visual inspection of the outside lane of the BCO, observing the
cracks and distress, and taking photographs to document findings. The survey was performed
while walking on the outside traffic lane, while a cushion truck and protection vehicles, provided
by the district, moved along behind and ahead the surveyors. Besides recording the signs of
distress, because of the level of protection provided by the traffic control crew, the survey team
had the opportunity to perform sounding along the entire outside lane to detect any delaminated
areas of the overlay. Delaminations are indicated by the characteristic hollow sound produced
when a steel bar is dropped onto the pavement surface. Commonly, delaminations start at the
edges of the pavement, most likely, along the longitudinal edge of the lanes, and propagate45
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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/m1/65/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.