ASTM D4355-2014 Standard Test Method for Aging of Geotextile
September 14, 2020
For the current artificially merged high molecular polymers, sunlight radiation is the primary factor that promotes the degradation and aging of polymers. The ultraviolet radiation in sunlight is undoubtedly the natural enemy for geotextiles. Due to UV radiation, high molecular polymers produce light. Oxidative disintegration has obvious disintegration effect on high molecular polymers.
The intensity of ultraviolet radiation changes with the intensity of solar radiation, and the aging speed of geotextiles changes with the intensity of ultraviolet radiation; the aging factors of geotextiles will also be affected by other factors such as geotextile type, structure, color tone, temperature, humidity, admixture, etc. Closely related.
ASTM D4355-2014 passed the standard test method for aging of geotextiles under exposure to light, humidity and heat with xenon arc test equipment.
1. Scope of application
Standard test method for aging of geotextile exposed to light, humidity and heat of xenon arc lamp equipment.
This test method specifies the determination of the tensile strength degradation of geotextiles exposed to xenon arc lamp radiation, moisture and heat.
2. Equipment and materials
Xenon arc lamp equipment: Daylight filter meets G151 and G155. The sample can be exposed to light cycle and water spray cycle with light and humidity control.
Five geotextile samples for machine direction and cross machine direction were exposed to each of the following times in the xenon arc device: 0h, 150h, 300h and 500h.
Exposure cycle 120min:
Step 1, light for 90 minutes, non-insulating blackboard temperature (BP) 65±3℃, relative humidity 50±10%;
Step 2, light for 30min + water spray.
After each exposure cycle, the sample is subjected to a cut or tensile test strip tensile test. Compare the average breaking strength in each direction with the average breaking strength in each direction of the reference sample. Plot the retained strength percentage of the sample against the exposure time to obtain the tensile strength change curve of the sample from each direction.