Geocells are made of polymeric material, which tends to creep over time.
Creep is the inevitable elongation of any polymeric material under load.
When a material creeps or elongate, it loses its shape and properties, which results in deformation.
Creep is an irreversible process, which is influenced by 3 main factors or causes: load, time and temperature.
The combination of these 3 factors will determine how long the geocell can maintain its original shape and properties.
High load, high temperature and long periods of time will accelerate the creep process.
Therefore, when considering a long term geocell solution, it’s important to take creep into consideration.
Geocell creep resistance is the ability of the geocell to resist the process of creep and elongation. In other words, geocell creep-resistance indicates how long a geocell can resist any kind of deformation when it’s being applied with loads over an extended period of time.
Testing and evaluating geocell‘s resistance to creep is a crucial factor for the geocell performance over time, since when it comes to applications with high temperature and heavy loads over a long period of time, creep becomes a serious issue.
The standard test to determine a geocell creep resistance, is called Stepped Isothermal Method (SIM), which was developed for the space and military industries, and can predict the creep rate of polymers.