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Separation is defined as, “The introduction of a flexible synthetic barrier placed between dissimilar materials so that the integrity and the functioning of both the materials can remain intact or be improved”. Geotextiles are most suited to this application.
In transportation applications, separation refers to the geotextile’s role in preventing the intermixing of two adjacent soils.
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Filtration: It can be defined as “ The equilibrium geotextile-to-soil system that allows for adequate liquid flow with limited soil loss across the plane of the geotextile over a service lifetime compatible with the application under consideration”. To perform this function, the geotextile needs to satisfy two conflicting requirements: the filter’s pore size must be small enough to retain fine soil particles while the geotextile should permit relatively unimpeded flow of water into the drainage media. A third factor which is involved is the long- term soil-to-geotextile flow compatibility that will not excessively clog during the lifetime of the system. Geotextiles are well suited for this application.
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Maccaferri has a wide range of Products for performing the above two functions. MacTex geotextiles which are available in woven & non woven forms provide an effective solution to the age- old problem of constructing stable granular layers over soft foundation soils. When a granular layer is constructed directly on a soft subgrade, external loadings like traffic cause intermixing of granular material with the soft subgrade resulting in the loss of bearing strength of the granular layer and premature failure of the structure. The overall stabilization function performed by MacTex geotextiles can be divided into three fundamental components:
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Separation: MacTex geotextiles prevents the intermixing of the granular layer with the soft subsoil to maintain integrity. This enables the granular layer to achieve maximum bearing strength throughout its depth over the full design life of the structure.
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Filtration: MacTex geotextiles allows controlled passage of excess pore water from the soft Subgrade.
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Confinement: MacTex geotextiles restrain lateral movement of the material at the bottom of the granular layers.
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Drainage: This is also one among the very important functions which Geo-synthetics has to perform. Drainage can be defined as”the equilibrium soil-to-geotextile system that allows for adequate liquid flow with limited soil loss within the plane of the geotextile over a service lifetime compatible with the application under consideration.” Geotextiles and geocomposites are well suited to this application. |
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MacTex N non- woven needle punched geotextiles are best suited for drainage purposes as they have considerable void spaces in their structure and this space is available for liquid transmission.
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Some applications where MacTex geotextiles have been used for the purpose of drainage/ separation/ filtration include; under road pavements, foundation stabilization, under Reno mattresses & rip-raps, behind gabion & reinforced soil walls, landfill cushioning layers, under railways etc. |
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Geocomposites which are manufactured using geotextiles, geomats, geonets and/or geomembranes in laminated or composite form may also be used for these purposes.
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