Materials selection for concrete overlays : the final report Page: 40
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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The distress observed included punchouts, corner breaks, pumping stains along
longitudinal joints, and open cracks. There were a few open joints, both longitudinal and
transverse. It was obvious that several patches had been repaired and had failed again. There
were also some slabs in good condition without cracks or distresses. More than 100 areas of
distress needed to be repaired prior to BCO placement, and those areas were already marked with
spray paint at the time of this survey, as can be seen in the photographs, shown in Appendix A-5.
3.11 Sherman - US 75 (Construction)
On June 12 2010, a survey was performed on the new bonded concrete overlay (BCO) on
the SB half-mile-long section of US 75, in Sherman. The overlay is a 7-in.-thick BCO on top of
the existing 9-in.-thick jointed concrete pavement, which was approximately 28 years old BCO
was selected to solve the recurring repair problems on this section of highway.
The survey consisted of visually monitoring the construction of the outside lane of the
half a mile-long BCO section and recording details with photographs. The prepared surface was
checked to be sure there was no debris that could cause debonding, and to ensure that the surface
ahead of the paver was kept in saturated surface dry (SSD) condition by spraying water and
blowing off any standing water just before the paver covered the substrate with fresh BCO
concrete. Also, quality control was performed by monitoring the construction, finishing, and
curing process.
3.11.1 Surface Preparation and Placement of Reinforcements
The surface was roughened up and cleaned before the BCO placement. However, the
survey team noticed that the yellow pavement stripe was still on the cleaned substrate. This
raised concern that the probability of the stripe acting as a debonder at the interface, especially
since it was adjacent to the longitudinal joint. Therefore, the contractor had to remove the
yellow stripe and thoroughly clean the surface again before the construction began. Figure 3.4
shows the pavement before the yellow strip was removed and Figure 3.5 shows it after removal.Figure 3.4. Prepared surface prior to the yellow stripe removal
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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/m1/60/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.