NAUE GmbH & Co.KG

NAUE GmbH & Co. KG are one of the leading worldwide manufacturers of geosynthetics. The company was established over 30 years ago with the object of serving the civil engineering industry with tailor-made products for the various types of applications such as filtration, drainage, protection, separation, reinforcement, sealing and erosion control. We have made considerable advancements and our products have been used successfully in the following fields: the mining industry, hydraulic engineering, large dams, earth and road construction, the construction and capping of landfill sites, environmental protection.

Functions

Filtration 
A geotextile filter layer withholds solid components, whilst allowing liquids to pass almost freely perpendicular to the filter plane.

Drainage
Drainage is the collection of precipitation, groundwater and other liquids or gases which have to be discharged. Drainage systems are supplied as single elements or composites consisting of at least one filtering layer and one percolation layer.

Separation
Geotextiles separate adjacent soil types or fill materials preventing them from becoming intermixed. They are used in the form of durable, robust nonwoven or woven fabrics and/or composites manufactured of synthetic raw materials able to withstand high loads.

Protection
Geomembranes, coated and non-coated structures need to be protected against mechanical damage. Without protection layers, damage would occur from sharp-edged irregularities of the underground or the filling material.

Reinforcement
When used for reinforcement purposes, geotextiles, geogrids and composites are placed below or between soil layers to take up tensile forces and thereby improve mechanical properties.

Sealing
Sealing is indispensable for environmental and groundwater protection and contributes substantially to the fitness for use and service life of buildings.

Packing
In geotechnology and hydraulic engineering, earth materials in particular are 'packed' in flexible tubes, sacks and containers.

Erosion Control
Three-dimensional geosynthetics and composites prevent the removal of soil particles by water and wind. In nature, it is the plants with their roots that prevent the soil from being carried away.

Landfill Base Lining

Both the US Environmental Protection Agency (EPA) Federal Regulations as well as the European Council Directive on the Landfill of Waste describe prescriptive cross sections for hazardous and non-hazardous waste landfill base lining systems.

Sealing
The base lining is designed to prevent the escape of contaminants from landfill waste into underlying soils. A properly constructed liner system should also allow for the controlled collection and removal of landfill leachate for subsequent treatment.

In regions where local soils are not suitable for the construction of hydraulic barriers, Bentofix® geosynthetic clay liners (GCLs) can be used to protect the hydrogeological resources by providing an effective barrier against potential risks to the environment. Typical compacted clay liners (CCL) are difficult as well as expensive to build. In many cases, they are subjected to installation conditions that can cause desiccation cracking and create preferential flow paths. Bentofix® GCLs can replace or augment the typical CCL in most designs to minimise the effects of desiccation. Once covered, Bentofix® GCLs quickly hydrate with existing soil moisture to form a low permeable barrier. The quick and easy installation methods used for Bentofix® yield substantial cost and time savings when compared to expensive construction methods typical for CCLs.

When used in combination with Carbofol® HDPE geomembranes, Bentofix® GCLs can achieve the superior hydraulic performance obtained with exceptional intimate contact, and can minimise lateral flow of leachate - in the unlikely event of a puncture. A composite liner system incorporating Carbofol® and Bentofix® as the independent sealing elements is extremely effective when containing both polar as well as non-polar contaminants.

As Bentofix® geosynthetic clay liners are needle-punched over their entire surface area, they are capable of transmitting shear forces on steep slopes as well as within base lining systems. Bentofix® products produced with mechanically bonded nonwovens on both outer surfaces can be used to achieve higher interface friction angles and shear strengths.

Smooth surfaced 2.0 mm thick HDPE Carbofol® geomembranes are well suited for the lining of landfill base seals with slopes up to 9h:1v, and are available in various structured or textured versions for more demanding conditions. Unique surface structures and textures are used to address different slope inclinations and loads. During the manufacturing process, surface textures and structures are added directly to the layer of pliable HDPE Carbofol® geomembrane by a molding or spraying process. This step creates a homogeneous structured geomembrane made from a single material or resin, maximising the product shear strength characteristics.

Protection
High quality protection Secutex® needle-punched polypropylene (PP) nonwovens limit geomembrane damage and deformation during installation as well as during subsequent operational use.

Prior to the utilisation of a nonwoven for puncture protection, puncture tests similar to the cylinder test (DIN EN 13719) are recommended with site-specific materials and the test protocol as specified by the design engineer.

In instances where high chemical concentrations in the leachate are possible, NAUE can supply needle-punched Depotex® nonwovens with chemical resistant HDPE fibres.

Reinforcement
Long-term slope stability can be obtained with Secugrid® geogrids, either alone or in conjunction with other geosynthetic materials. When used with a geomembrane, Secugrid® reinforcement products can support the down slope forces while protecting the Carbofol® geomembrane from potentially harmful stresses.

The low initial elongation and the interlocking nature of the Secugrid® with mineral drainage layers ensures immediate stress transfer an