Materials selection for concrete overlays : the final report Page: 39
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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Figure 3.2: Typical section of US 75 in Sherman
3.10.2 Proposed Overlay
A typical cross-section of the BCO pavement is presented in Figure 3.3.14[ 21 14
-" 4EI ' HL - RAYEL-:AN -- TR V- !-of s SHLC EMBANKMENT
BLOCA SOD :BLOCK SOD
Figure 3.3: Typical section of the proposed BCO
It is not common to place a (continuously reinforced) BCO on top of a jointed pavement,
so this is considered an experimental overlay. Some of its outstanding design features are as
follows:
* Direct reinforcement placement: Research has shown that normal deformed
reinforcing bars placed on the substrate surface will achieve the same pull-out bond
strength as reinforcing placed at mid-depth of a 6-in.-thick slab. The decision to
place the reinforcement directly on the substrate saved construction time and labor.
* Surface preparation: The surface was adequately cleaned by shot blasting to achieve
a moderately rough texture. The surface was kept clean prior to placement of
concrete. No bonding agent was used.
3.10.3 US 75 Survey
The pre-construction survey was a visual inspection of the outside lane of the half-mile-
long segment from the shoulder, observing the cracks and other signs of distress, and making
photographic records. Because this heavily traveled road was still open for traffic, it was not
possible to conduct this survey with more detail.39
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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/m1/59/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.