Geosynthetics in roads and pavements

 

 

 

The Geosynthetic Solution 

Hard armor systems are quite expensive to 

construct.  Costs can range as high as $60 per 

square yard or more.   The performance of even 

the most expensive system can only be assured 

if it is protected against piping. Consequently, a 

filter layer should always be used beneath hard 

armor system in an erosive environment. 

 

Geotextiles have become standard filter layers 

for hard armor systems because they overcome 

the drawbacks of graded sand and aggregate 

filters.  First, they are manufactured with 

specific hydraulic and soil retention properties, 

which can be easily selected to complement the 

soil that needs protection.  Secondly, they can 

be installed with ease on slopes – even under 

water. 

 

 

 

A Hard Armor System – Properly Constructed