Abrasion of geotextiles

Currently the expression of geotextile resistance to abrasion is limited to compliance with these and other related abrasion tests rather than acceleration and related modeling and the prediction of abrasion-related design life. 

6 Determination of durabiiity of reinforcement and drainage appiications using reduction factors 

The use of RFs is not always appropriate. For example, we have seen that when an antioxidant is depleted for a polyolefin geotextile, the loss of mechanical properties may occur rapidly. In this case it is more appropriate to predict service life than to calculate an RF, ensuring that the projected service life is more than the required lifetime. 

These reduction factors are generally common to both ISO and American Association of State Highway and Transportation Official standard guidance and are determined in accordance with the procedures and standard referenced here. 

If a limit is established for the maximum allowable strain of the geotextile reinforcement, in addition to calculation of there must be a calculation of long-term strain in parallel. For these reasons it is always beneficial to capture both strain and time in creep-rupture testing. 

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To represent better conditions in situ, a test was established to take into account the abrasive load induced by hydraulic processes on the bank and bottom of waterways. The rotating dmm test (RPG, 1994) was developed for geotextile filter layers under riprap. The single armourstone always has some space that allows rocking movements under hydraulic loads which can abrade the fabric. This test also proved suitable for checking resistance against abrasion of geotextiles that are not protected by armour and are loaded by sediment and bed-load transport. Recovered samples proved the similarity to fabric that was tested in that device. 

Figure 11.8 Abrasion failures of geotextiles placed too close to railroad track structure.

ASTM D4886, Abrasion Resistance of Geotextiles Sand Paper/Sliding Block Method. 

The abrasion resistance is particularly important in the surf environment where coarse angular sand, shell fragments, or coral debris are present. The larger thickness of nonwoven geotextiles and the ability of their structure to retain sand material... 

UV-radiation and abrasion. However, it is stUl not clear whether it may cause serious changes or detrimental effects on the mechanical properties of the geotextile over lifetime. 

Spunbond processes and fabrics have been commercial for over 40 years. The processes, fabrics, and markets are quite varied. The best known spunbond fabrics and markets are cover stock for diapers and feminine hygiene products. However, spunbond fabrics are also found in carpet backing, geotextiles, furniture dust covers, carriers for fabric softeners, and a host of other industrial and consumer applications. The key to most of these markets has been a low cost covering material with sufficient tensile and opacity properties to fit the application. The latest market trend is towards pre-wetted wipes for cleaning and similar uses. The product needs for this fabric include short term abrasion resistance and ability to hold solvents. 

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