Polypropylene geotextiles

The positive effect of the use of geotextile is documented by many field studies as well as comprehensive researches, namely. Potter and Currer (1981) and Robnett and Lai (1982). The measured surface deformation on the unbound layer laid over a subgrade with CBR 2% was much lower when a 450 g/m polypropylene geotextile with a tensile strength of 10.5 kN/m was used (Potter and Currer 1981). 

Richaud, E., F. Farcas, L. Divet, and J. P. Benneton (2008). Accelerated ageing of polypropylene geotextiles, the effect of temperature, oxygen pressure and aqueous media on fibersmethodological aspects. Geotextiles and geomembranes 26, 71-81. 

Tisinger LG et al. (1990) Microstmctural Analysis of a Polypropylene Geotextile after Long-term Outdoor Exposure. In Koemer RM (ed) Geosynthetic Testing for Waste Containment Apphcations, ASTM Special Technical Publication 1081. ASTM, Philadelphia, USA, pp 335-354... 

J. D. M. Wisse, C. J. M. Broos and W. H. Boels, Evaluation of the life expectancy of polypropylene geotextiles used in bottom protection structures around the Ooster Schelde storm surge barrier — A case study, Proc. ffh Conf. Geosynthetics (1990), pp. 697-702. 

Stormont, J. C., Henry, K. S., Evans, T. M. (1997). Water retention functions of four nonwoven polypropylene geotextiles. Geosynthetics International, 4(6), 661—672. Svedova, J. (1990). Industrial textiles. NY Elsvier Science Publishing Co. Inc. 

K Sen, P Kumar. Polypropylene geotextiles long term stability and prediction of service life. Proc World Textile Congress on Polypropylene in Textiles,... 

Depending on site-specific conditions, there may be other features such as air pollution, ozone, product orientation, moisture conditions and duration, etc. That said, a concentrated effort on to predict the lifetime of geotextiles has been ongoing at the Geosynthetic Institute this section is the status-to-date for four different types of commercially available polypropylene geotextiles. 

Modified from Stormont, J.C., Ray, C., Evans, T.M., 2001. Transmissivity of a non woven polypropylene geotextile under suction. Geotechnical Testing Journal, GTJODJ 24(2), 164-171. 

Woven polypropylene geotextiles are characterised by medium pore sizes (0.3—0.6 mm) with medium water flow (15—50 L/m per s), which makes them effective filters for sands and sandy soils. They have relatively low maximum elongations (10—20%), which enables them to maintain a stable stractural shape. They also have good tensile strength (80—200 kN/m), which enables them to be used in stractural roles and to be installed at significant water depth if required. 

The required size and exposed location of the submerged breakwater/sUl necessitates the use of heavily stabilised woven polypropylene geotextiles for the tube skins or composite geotextile skins. Although these types of structures have been observed to attract extensive marine growth relatively quickly after construction (which acts as a form of natural protection), they must still have the required U V stability and abrasion resistance to perform in these exposed locations over their design life. 

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