Subgrade, reinforced-soil wall and slope design lives are much longer than short laboratory tensile tests. Comparing only a nominal value such as 50 kN/m can hide major differences in material behaviour.
Short-term tensile strength is one input
Polymer, construction, principal direction, strain level and junction efficiency differ among geogrids. Equal nominal strength does not imply equal design capacity.
Understand the reduction framework
Design commonly considers creep, installation damage and environmental durability. The governing standard and designer determine the applicable methodology and factors.
Write verifiable purchase requirements
State product type, direction, tensile value at specified strain, long-term evidence, methods, lot testing and connection performance where relevant.
Project action list
What the procurement or project team should do next
Obtain the designer’s long-term strength requirement
Match strength with the specified strain level
Provide actual fill and installation method
Do not substitute grid types on nominal strength alone