Problem
This project specifies a triplanar geocomposite as a drainage layer
on top of existing concrete pavement with full depth asphalt overlay.
TENAX TENDRAIN will be used for 1.8 km of roadway 2 lanes wide.
The existing pavement is hydraulic cement concrete paving of varying
depth and reinforcement. This pavement is jointed.
soluTION
The work consists of breaking and seating the existing concrete
paving for full depth and full panel width.
Installing TENAX TENDRAIN drainage geocomposite on the existing
concrete pavement section and overlaying it with asphalt concrete.
The pavement structure consisted of three layers totaling 240 mm
of asphalt concrete, i.e. 150 mm BM-25 (Base), 50 mm IM-19A (Intermediate),
and 40 mm SM-12.5D (Surface wearing course). The geocomposite will
consist of a triplanar geonet core with 270 g/m2
nonwoven geotextile laminated to each side. Prior to the TENAX TENDRAIN
installation, an asphalt tackifier was placed on the existing concrete
paving. The TENAX TENDRAIN was then installed directly in the tackifier
minimizing any wrinkles in the drainage geocomposite. A steel drum
roller made two passes on top of the geocomposite to ensure good
adherence to the existing pavement section.
A 90 mm lift of base asphalt was then placed directly on top of
TENAX TENDRAIN using a rubber tracked asphalt box. The asphalt was
then compacted with standard static steel drum rollers. After the
initial lift of asphalt was placed, the road section was then opened
to traffic with 75 mm of compacted asphalt directly on top of the
TENAX TENDRAIN triplanar geocomposite. The next lift of base asphalt
was placed within 30 days to a final asphalt thickness of 90 mm.
conclusionS
The TENAX TENDRAIN increased the design life of the pavement structure
by providing lateral drainage and reinforcement. The three-planar
structure worked as a stress dissipation layer between the existing
cracks and joints in the base concrete pavement and the above asphalt
overlay. |
geo@tenax.net