PHOENIX – At the Loop 202 South Mountain Freeway’s future interchange at 17th Avenue, patterned walls being assembled in Lego-like fashion offer a glimpse of a construction technique that’s essential to completing the project by late 2019.
These mechanically stabilized earth walls, commonly referred to as MSE walls, are concrete panels as large as 5-by-10 feet that fit into place. They are part of a system, used on Arizona Department of Transportation projects since the 1970s, using the walls and steel reinforcing straps to construct the retaining walls under bridges.