non-woven polypropylene geotextile Articles

  • Effect of Dissolved Oxygen (and Bubbles) on the Measured Permittivity of Geotextiles

    Measurements are made of the permittivity in a heat set, nonwoven staple filament polypropylene as a function of the dissolved oxygen content (DOC) of the water. Vacuum deairing of the water to a DOC of 5 ppm or below insures that the measured permittivity will not be lowered by oxygen effects. Careful long-term measurements show that the measured permittivity is reduced very significantly if the ...


    By ASTM International

  • Geotex® Geotextiles: A Life Cycle Costing Approach to Roads

    Subgrade contamination is the leading cause of failure in both pavements and unpaved roads. Aggregate layers used to support the traffic or pavement typically rests on a subgrade of sand, silt or clay. Without permanent separation, two factors will undoubtedly lead to the contamination of the aggregate layers—fine-grained soils will enter into the voids of the aggregate, preventing it from ...

  • Treatment of domestic greywater by geotextile filter and intermittent sand filtration bioreactor

    Intermittent sand filtration (ISF) is an efficient system for treatment of greywater; however, the high quality of effluent and the simple set-up contrast with the high failure rate due to clogging of surface layers. The efficacy of several polypropylene non-woven geotextiles (apparent opening size from 0.10 to 0.18 mm) used as primary treatment filters to remove suspended particles from ...


    By IWA Publishing

  • Bus station wellingholzhausen, Germany case study

    Use of Combigrid under the bearing layer The old bus station in front of the school in Wellingholzhausen, Germany needed to undergo repair. The very weak subsoil caused to the growing traffic settlements in several areas. Additionally the subsoil and the bearing layer had an insufficient filter stability, which caused an intermixing of the soils and a reduction of the frost resistance ...


    By NAUE GmbH & Co.KG

  • Urban Stream Restoration: Standing Up to the Toughest Weather Conditions

    Project In 2008, the City of Altanta faced a large problem: the single-lane road that provides the only entry point to its SWAT team training center was likely to be lost completely to erosion. Although the road had been lined with concrete barriers as a stop-gap measure, it was clear that more substantial action was required to save it. Because the road is situated on a narrow ...


    By Thrace Plastics Pack S.A.

  • Geosynthetic frost & salt barrier

    Terram FSB (Frost and Salt Barrier) has been successfully used to mitigate the effects of frost heave and salt damage for a road and rail project in the wetlands of western Kazakhstan. In the wetlands of western Kazakhstan the weather is characterised by very low temperatures in the winter (down to -400C) and high temperatures in the summer (up to +400C). The nature of the ...

  • Processing Wastewater Sludge Using Dewatering Containers

    The relative cost of dewatering equipment varies widely and is directly related to the processing rate. For smaller utilities that need to dewater sludge in batches, dewatering containers are an alternative that can be relatively inexpensive and simple when compared to other technologies on the market. The most common type of dewatering container is based on a roll-off box design, although any ...


    By Flo Trend® Systems, Inc.

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