Materials selection for concrete overlays : the final report Page: 34
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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3.8 Houston - IH 610 North
On October 28, 2009, a visual condition survey was performed on the BCO sections on
IH-610 North, in Houston.
One of the earliest BCO experiences in the state, from the 1980s, was the subject of this
survey; the overlay project is located on IH-610 North, between East T.C. Jester Blvd. and IH-45
(from station 207+78.37 to station 400+00). In this section, the main roadway is an eight-lane
freeway, with four 12-ft. lanes in each direction, a 20-ft. median with a concrete traffic barrier
and 10-ft. outside shoulders. The original pavement structure, constructed in the late 1950s,
consists of an 8-in.-thick slab of CRCP on top of a 6-in.-thick cement stabilized subgrade. The
BCO is a nominal 4-in.-thick CRCP constructed in 1986. At the time this survey was conducted,
construction had begun already for the placement of a new pavement, so part of the overlay was
already removed, and only some lanes could be observed. The surveyors took advantage of the
construction closures to be able to walk the section and perform the survey within a barricaded
area closed to traffic. The project staff considered it a valuable opportunity to visit this overlay to
observe its performance before it was completely removed.
One of the most interesting features of this BCO was that it included ten experimental
sections, each with different combinations of reinforcement types, coarse aggregates, bonding
agents and existing pavement conditions (various levels of distress). The characteristics of each
of those experimental sections are presented in Table 3.5. During and after the overlay
construction, back in 1986, delamination occurred between the BCO and the original pavement.
A study [30] of those sections at that time found most of the delaminations occurred within the
first 24 hours of age and happened on segments constructed when the difference between the
maximum and minimum daily temperature was greater than 25 F and the evaporation rate was
greater than 0.2 lb/ft.2/hr. However, those delaminations did not appear to have any effect on the
overlay performance. The layout of the experimental sections is shown in Figure 3.1.
Table 3.5: Experimental section factorial (Section number)
Reinforcement Welded Wire Fabric Fibers
Pavement Original No Moderate Severe No Moderate Severe
Condition Distress Distress Distress Distress Distress Distress
2 1 6 4
BCO Coarse SRG 1964
10 3 9 5
Aggregate
LS 8 734
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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/m1/54/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.