ASTM D4355 is a standard test method for deterioration of geotextiles by exposure to light, moisture and heat in xenon arc type apparatus. This test describes the determination of the deterioration in tensile strength of any permeable textile material employed with earth, foundation, soil, rock and so on. It is based on practice ASTM G155. Micom offers ASTM D4355 testing as part of its polymer test services.
Deterioration of geotextiles
By exposing the samples to xenon arc radiation, moisture and heat (end use conditions), it is intended to induce property changes. Indeed, polymers can have their mechanical, electrical and optical properties significantly altered when exposed to these types of factors. The simulation of the deterioration provoked by localized weather, such as, atmospheric pollution, biological attack and salt water exposure is not intended by the exposure used in this practice. Following each exposure period, the specimens are subjected to a cut or ravel strip tensile test in order to produce a degradation curve. The latter allows the user to determine the tendency of a geotextile material to deteriorate when exposed to various factors such as solar radiation, water and heat. For a combination of UV exposure and salt water, you should consider ASTM D5894.
Typical Experimental parameters for ASTM D4355 testing
The characteristics of the samples and operating conditions are specified in Tables 1 and 2 respectively.
Table I : Specifications of the characteristics of the samples
|Number of specimens required||20 for each orientation tested|
|Specimen size||50 x 150 mm (2 x 6 in)|
|Thickness||Within ± 10% of the nominal dimensions|
Table II: Specifications of the operating conditions of the equipments
|Irradiance level||0.35 W/(m2 nm) at 340 nm
Maintained at 0.02 W/(m2 nm)
|Exposure cycle||90 min of light only at 65 ± 3 oC (149 ± 5 oF) uninsulated black panel temperature;
30 mins of light with water spray
|Relative humidity||50 ± 10 %
(During light exposure only)
|Lamp filter||To be specified
(Daylight, Window Glass or Extended UV)
Other test methods related to ASTM D4355
For additional related test methods, please see polymer test services.
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