ASPHALTopcs | Summer 2017 | VOL 30 | NO 2

transfer areas in the composite
pavement structure, the solution
to the voids was to drill 11,000 holes
to inject grout under pressure below
the concrete. In addition, 6,600 steel
dowel bars were installed to help
transfer the load between the
concrete slabs.
“The slots for the dowel bars
required specialized machinery,
so we contracted Randy Cole of
Cole Concrete Cutting in Wyoming,”
Carinci says. “This company has one
of three machines in the U.S. that can
do this work. It was critical that Cole’s
equipment be used from April 1 to
the 17. Equipment in Canada can
only make 300 slots per day, whereas
Cole’s machine made 900 and had
a capacity of 1,200 slots per day.”
Runway 05-23 runs east-west and
is 3,300 metres long by 61 metres
wide. Once the concrete repair work
was complete, 20,000 tonnes of
PGAC 64-28 lower course asphalt
was laid. The surface course asphalt
required 50,000 tonnes of PGAC
70-28 polymer-modified asphalt
cement. Work was staggered for
the rehabilitation of two interacting
runways (15L-33R and 15R-33L), with
three days devoted to each of those
portions of the runway to minimize
disruptions to the runways.
Prior to the application of the surface
course, some areas were padded to
meet the specified longitudinal profile
of the runway. The built-up crown
of the runway has approximately
200 mm of asphalt on top of the
original concrete base, and the
intersecting runways gradually
slope to meet the crown of the
primary 05-23 runway.
“Most of the loads are on the centre
23 metres of the runway, so we didn’t
do a lot of work on the concrete
outside of this area,” says Kevin
Chee, Senior Civil Engineer for GTAA.
“There is 200 mm of asphalt at the
centre of the runway at 1,000 metres
in length on the west end, because
testing showed the greatest number
of voids in this location. There is
hardly any load at the edges of the
runway, so these sections only had
a 65 mm asphalt overlay.”
Excavation work ran day and night,
while concrete pours and asphalt
paving work occurred during the
day. Echelon paving of the runway
surface course took place in just 10
days, with one steady 60 mm thickness
for the surface pavement. Each of six
pavers paved five metre swaths for the
centre 30 metres of the runway. The
base asphalt was carried out by four
paving crews, while the surface asphalt
required six paving crews, four shuttle
buggies, 40 trucks and two asphalt
plants producing a total of 8,000
tonnes of asphalt per day.
“It was important not to have any cold
joints at the wheel path of aircraft, so
the job required echelon paving with
six pavers for the centre 30 metres ››
SUMMER 2017 13