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Concrete Pavement Progress
www.acpa.org16
“The contractual grinding specs were to meet a Half-car
Roughness Index (HRI) of less than or equal to 150 in. per
mile at a maximum grind depth of 0.5 in.,” he explains.
“If the concrete pavement smoothness couldn’t meet this
specification, then the contractor had to meet a HRI per-
cent improvement of 50 percent or greater per segment per
travel lane. If the pavement already had anHRI of less than
or equal to 150 inches per mile then the contractor had to
meet an HRI of less than or equal to 80 inches per mile
without exceeding the one-half inchmaximumgrind depth.”
To determine the extent and depth of grinding, the con-
tractor, Multiple Concrete Enterprises (MCE), conducted
a preliminary profile with a high speed profiler to calculate
the roughness index, explains JimMcGee, general manager
of MCE. “If the road segment was outside the specifications,
that segment was repaired.”
In addition to the grinding, some panels had to be replaced
or repaired. Some of the original 35-year-old panels also
required joint resealing.
As most of the roads in Highlands Ranch are residential,
traffic and noise concerns had to be addressed. Lessons
learned in the first year of the four-year project were applied
to subsequent years to address resident concerns, including:
» Project phasing
Lane closures were required for the duration of the
project. In the first phase, closures were extended to
allow for three to four weeks of work and remained in
place during construction. This generated many traffic
flow issues through the length of the work zone. Traffic
backups were resolved in the second phase with lane
closures that reflected one to two days of work and daily
removal of traffic control devices.
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