Many regions of the world are covered by weak and expansive clay soils. These soils undergo large amounts of heaving and shrinking due to seasonal changes in their moisture content. Structures built on such “fat” clays are subject to cracking and buckling, resulting in extensive damage, estimated at 9 billion dollars annually in the US along (Zhao et al 2014).
PRS-Neoloy geocells offer a unique solution to expansive clay soils. The beam effect of the Neoloy based PRS-Neoloy mattress acts as “I” beam or semi-rigid platform. This separates the weak subgrade with the pavement structure and reduces swelling and differential heave. Vertical stresses are reduced and load distribution is improved.
The effectiveness of this solution – increased when used in conjunction with a biaxial geogrid – has been proven in the field in roadways and railways around the world. The geogrid provides a stable working platform on the weak strata, which increases the reinforcement of the PRS-Neoloy geocell layer. The “modulus improvement factor” (MIF) of PRS-Neoloy has been proven in the lab and in the field to increase pavement layer strength by 2-5x.
Now there is a proven and effective solution available for roadways and railways on expansive clay soils.