Materials selection for concrete overlays : the final report Page: 38
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Following the survey of this group of experimental sections, the remaining part of the
eastbound overlay until its limit near Telephone Rd., was surveyed from the vehicle. The overall
condition was good, but there were a few distress symptoms, including several patches, some
covering the full width of the lane and some half of it. There were also some longitudinal cracks
and a few spalls. The westbound overlay was surveyed in a similar manner, from the vehicle
traveling on the outside lane at very low speed, while being protected by the cushion truck in the
back. The condition of the westbound overlay was good as well, and the presence of distress is
comparable to the eastbound lanes, both in frequency and severity.
Finally, the eastbound experimental sections from 1983, which start after the Cullen
Blvd. Bridge, were surveyed in detail, walking on the outside lane and conducting sounding
tests. This part of the survey started around 11 am. These sections were in excellent condition,
even better than the 1989-1990 experimental sections. Only one longitudinal crack, and a
segment about 20-ft. long that had some delamination, were noteworthy, besides the otherwise
outstanding condition of the overlay. That delaminated area was next to an exit ramp, separated
from it by a wide longitudinal joint, which probably triggered the delamination.
In summary, both the experimental sections and the remaining part of the BCO were in
very good condition. The 1983 experimental sections, even though they are very short, seemed to
be in the best condition among the sections surveyed in this trip. The good performance of the
overlays was remarkable because they have been in service for a long time, while carrying some
of the heaviest and most intense traffic in the state.
3.10 Sherman - US 75 (Pre-construction)
A condition survey was conducted on a jointed concrete pavement in Sherman. Even
though this is not an existing overlay, because a new bonded concrete overlay (BCO) was going
to be constructed on top of the existing pavement on a section of US 75, in Sherman, it was
considered a valuable project to study, as there are not many opportunities of visiting the site of a
future overlay and following up through its construction. On February 10, 2010, a survey was
performed on this pavement prior to the construction the BCO, to observe the distresses that
existed on the original surface.
The construction site is half a mile long, just north of US 82, and it includes only the
southbound direction. The overlay consists of a 7-in.-thick BCO on top of the existing 9-in.-thick
jointed concrete, which is approximately 28 years old. According to the TxDOT engineer who
helped CTR during this visit, Mr. Ali Esmaili-Doki, this section of pavement required patching
every year, so TxDOT decided to place a BCO to solve this recurring problem.
3.10.1 Existing Pavement
A typical cross-section of the existing jointed pavement is shown in Figure 3.2, showing
two main lanes with shoulders on either side.38
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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/m1/58/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.