NAUE Combigrid® was used to improve the load bearing capacity of the subgrade in the construction of a new 2-lane roadway in Saskatoon, Saskatchewan.
NAUE Combigrid® 30/30 Q1 151 GRK3 was chosen for the Saskatoon roadway project because its unique combination of both geotextile and high strength geogrids, in a single product, provides a stable platform on weak sub-soils while reducing aggregate depth requirements. Combigrid is a flat composite geogrid, with firmly welded junctions and central integrated Secutex® non-woven components, for reinforcing pavements and soft subgrades where filter and separation properties are required.
Drew Mitchell, General Manager, Saskatoon Division at ASL Paving says: “City of Saskatoon engineers were faced with the challenge of an extremely soft subgrade, and installing Combigrid® provided the ideal solution. Using Combigrid® ensured that the requirements of both stabilization and separation of the subgrade were achieved; it was also important that the granular base layer was not compromised by contamination from fines in the subgrade, so reducing its ability to interact with the geogrids.”
“Our experience of using Combigrid® 30/30 Q1 151 GRK3 on similar projects, where subgrade conditions were very poor, have all produced very positive results” says Drew Mitchell. “A further benefit of using Combigrid® is that it is easy to install and helps prevent the need for further excavation and replacement of the subgrade material. This in turn reduces labour and time on site, resulting in considerable cost savings for the work.”
In total, 28,500m2 of Combigrid® 30/30 Q1 151 GRK3 was supplied in standard 4.75m wide, 100m long rolls. ASL Paving was able to rapidly install the Combigrid® by simply rolling it out onto the prepared sub base. An aggregate course was then laid and compacted to create a reinforced, mechanically stabilized composite layer.
Project Name: Claypool Drive Road Twinning – Airport Drive to Hampton Gate North
Engineer: City of Saskatoon
Contractor / Installer: ASL Paving Ltd
Product: Combigrid® 30/30 Q1 151 GRK3