Materials selection for concrete overlays : the final report Page: 37
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BCO. The reinforcement was wire mesh and the coarse aggregate was limestone. Portland
cement grout was used as the bonding agent. The original pavement was 8-in.-thick CRCP [30].
This BCO project included ten experimental sections, each 400-ft. long and four lanes
wide, in which several combinations of bonding agents, reinforcements and surface treatments
were implemented. The experimental sections were placed in the eastbound direction only.
Table 3.8 shows the combinations implemented in each test section [3].
The survey for this BCO project consisted of a visual inspection of the experimental
sections and of the rest of the overlay, as well, An emphasis, however, was placed on walking
the experimental sections, both the 1983 and 1989-1990 BCOs in the eastbound lanes, while the
remaining part of the eastbound and westbound BCO was surveyed from a vehicle traveling at
low speed.
The survey started at approximately 9:30 am, on the eastbound lanes, at Calais St., where
the 1989-1990 BCO experimental sections begin, and proceeded eastward. The researchers
walked this segment on the inside lane while recording observations, taking photographs, and
also performing sounding tests. Some representative photographs from the survey are included in
Appendix A-4.
Table 3.8: South Loop IH-610 experimental factors for 1989-1990 BCO
Test
et Date of Surface
Section Paving Preparation Bonding Agent Reinforcement
Welded Wire
A 1/2/90 Cold Milling PC grout Fabric
Fabric
1 1/2/90 Cold Milling None Fabric
2 1/2/90 Cold Milling PC grout Steel Fibers
Welded Wire
3 1/2/90 Cold Milling PC grout Fabric
4 7/10/89 Light EpoxyWelded Wire
Shotblasting Fabric
Light Latex Modified Welded Wire
5 7/10-11/89
Shotblasting PC grout Fabric
Heavy Latex Modified Welded Wire
6 7/11/89
Shotblasting PC grout Fabric
Heavy Welded Wire
Shotblasting Fabric
Heavy Welded Wire
Shotblasting Fabric
Welded Wire
B 7/11/89 Cold Milling PC grout Fabric
The segment between Calais St. and Martin Luther King Blvd. includes the experimental
sections designated as A, 1, 2, and 3. One punchout and one patch were found in this stretch, but
the overall condition was good. No delaminations were found. The other experimental sections
from 1989, sections 4, 5, 6, 7, 8 and B (see Table 3.8), east of MLK Blvd., did not present any
signs of distress, and their condition was excellent.37
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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/m1/57/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.