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NEWS from NAUE Geosynthetics Ltd. |
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The FourDimensions of Secugrid®
The four dimensions of length (the bar), width (the geogrid), depth (the soil) and the time (durability) greatly influence construction project scope, design, product selection and expected service life. Beginning today, NAUE introduces you to a new four-dimensional way of understanding... read more
The FourDimensions of Secugrid®
The four dimensions of length (the bar), width (the geogrid), depth (the soil) and the time (durability) greatly influence construction project scope, design, product selection and expected service life. Beginning today, NAUE introduces you to a new four-dimensional way of understanding reinforcement applications: the Four Dimensions of Secugrid®.
Contact us for more information.  show document [close]
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Independent Field Study Confirms Secugrid and Combigrid’s Great Performance
From March 2008 to March 2009, NAUE GmbH & Co. KG, Germany cosponsored the construction of test cells for an independent field study of geogrid reinforcement in roadway subgrade stabilization. The Montana Department of transportation was the other cosponsor. The study and subsequent forensic... read more
Independent Field Study Confirms Secugrid and Combigrid’s Great Performance
From March 2008 to March 2009, NAUE GmbH & Co. KG, Germany cosponsored the construction of test cells for an independent field study of geogrid reinforcement in roadway subgrade stabilization. The Montana Department of transportation was the other cosponsor. The study and subsequent forensic evaluation of exhumed materials from numerous manufacturers, which included numerous product manufacturing methods, was carried out by the Western Transportation Institute of Montana State University. The results reveal exceptional performance by NAUE Secugrid and Combigrid materials. show document [close]
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ASA upholds challenge made by NAUE
The Advertising Standards Authority (ASA) has upheld a challenge made by NAUE that questions whether certain claims in a brochure published by Tensar International could be substantiated.
NAUE GmbH & Co. (KG) challenged whether:
1) The claims ‘These tests … demonstrated that... read more
ASA upholds challenge made by NAUE
The Advertising Standards Authority (ASA) has upheld a challenge made by NAUE that questions whether certain claims in a brochure published by Tensar International could be substantiated.
NAUE GmbH & Co. (KG) challenged whether:
1) The claims ‘These tests … demonstrated that TriAx outperformed the best performing biaxial geogrids’, and ‘Scientifically proven to functionally outperform biaxial geogrids’ could be substantiated, and
2) The comparison made in the ad was verifiable.
The ASA took expert advice from a qualified civil and structural engineer and, while Tensar defended the content of its brochure, the Authority upheld the complaint.
To read the full adjudication please visit the ASA website http://www.asa.org.uk/asa/adjudications/Public/TF_ADJ_46265.htm
and/or read our PDF file.
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Port of Call for Terrafix
Constructing the new outer harbour at Great Yarmouth has involved the extensive use of products from NAUE Geosynthetics to line and reinforce the walls of the newly built breakwaters. Twin breakwaters have been installed and dredging is taking place to form reclamation and to deepen the new harbour... read more
Port of Call for Terrafix
Constructing the new outer harbour at Great Yarmouth has involved the extensive use of products from NAUE Geosynthetics to line and reinforce the walls of the newly built breakwaters. Twin breakwaters have been installed and dredging is taking place to form reclamation and to deepen the new harbour basin. The latest phase of operations involved creating pilings for
the new quay wall along the northern breakwater and for this (and also for the southern breakwater) contractors, Van Oord UK and Nuttall, are using Terrafix 609 geotextile from NAUE as the solution to comply with the site method statement. show document [close]
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The Growth of Bentofix and the Geosynthetics Industry
During the EuroGeo 4, the Fourth European Conference on Geosynthetics, in Edinburgh, Scotland, the International Geosynthetics Society (IGS) awarded NAUE GmbH & Co. KG an IGS Award in recognition of the company’s activities on development and research on needlepunched Geosynthetic Clay... read more
The Growth of Bentofix and the Geosynthetics Industry
During the EuroGeo 4, the Fourth European Conference on Geosynthetics, in Edinburgh, Scotland, the International Geosynthetics Society (IGS) awarded NAUE GmbH & Co. KG an IGS Award in recognition of the company’s activities on development and research on needlepunched Geosynthetic Clay Liners.
This is the second award for NAUE this year from the IGS. In March, the company was recognized for its 20+ years of membership in the IGS, which itself is celebrating its 25th anniversary.
The needlepunched Geosynthetic Clay Liner Bentofix was developed in 1988, and since then a good number of refinements to the product’s construction and the manufacturing process have separated it from similar products in the field. Also, the field has benefited from these refinements in that these discoveries have improved product performance, spurred greater use of GCLs across numerous sectors, expanded design options for engineers and clients, and given standards committees, laboratories, universities and institutes more data with which to work and improve overall quality control.
In short, it has had a ripple effect.
The 1988 discovery of the needle-punch nonwoven geotextile method of manufacturing (Bentofix’s launching point) stands as a key example. The advance enabled not only the rapid, safe production of GCLs but the efficient shipping of GCLs in rolls. Also, the previously low friction coefficient of the sought-after clay used in GCLs—bentonite—ceased to be of concern because this new method of manufacturing transferred the shear stress from the clay to the highly engineered geotextile to which the bentonite had been bonded.
The speed of manufacturing, shear stress transfer, and ease of installation that needle-punching led to cannot be measured simply by square meters of materials produced; but the volume of production is worth noting and emblematic of the field’s growth.
It’s estimated that more than several 100 million square meters (includes licence manufacturing) of GCLs have been put into service and needlepunched GCL's have reached more than 90 % market share..
The Refinement Process
All manufactures find ways to improve their products at the point of production, and these stories are valuable. Some of the key refinements to Bentofix have been:
• A unique fibre-bonding process locks the needle-punched fibres into place. This creates a high internal shear-strength with unsurpassed creep resistance.
• The complete impregnation of the non-woven cover of the Bentofix with bentonite powder creates an ideal, intimate contact condition between the Bentofix and a geomembrane. This discovery came about during investigations into the flow rate between GCLs and geomembranes in composite systems (studies which were being conducted in 1992).
• Similarly, the 50-cm-width impregnation of GCL panel side overlaps with bentonite powder creates a self-sealing overlap and reduces additional on-site overlap treatment.
• Continuous development of the needling process has brought about a low (10%) moisture content in the Bentofix range of products.
• The addition of continuous needle detection and removal devices during manufacture has improved product quality.
Expanding Reach
Manufacture, of course, is not the only place in which companies expand expertise and realize product potentials. Expansion in application is key—again, not just for the manufacturer but for the entire profession—and NAUE has taken GCLs quite a ways.
For example: underwater installations, such as for canals.
NAUE has used a combined sandmat/GCL system for underwater installation, and it has opened the potential for GCLs to be used in waterway sealing without disrupting active traffic. The GCL provides excellent impermeability. The bentonite powder-impregnated 50-cm-edge (ie, sealed overlaps) assures long-term performance.
In this application, homogeneous swelling of the GCL below water and a long-term peel strength are created through the installation of a top layer made of an uniform thickness of quartz. The quartz also provides the weight responsible for the immediate sinking of the entire GCL composite. And the sandmat acts as a protection layer against the loading of a riprap layer.
Another example: the waste management industry’s use of GCLs.
GCLs provide economical and environmental advantages when used as the base layer in landfills instead of cells relying on multiple layers of hard-to-construct compacted clay. Also, GCLs can increase the potential containment volume and reduce the amount of necessary excavation. From a logistical view, the advantages are easy to see: one truckload of Bentofix, for example, covers 4000m² compared to only 40m² (50 cm thick) for a similar truckload of clay.
Similar logic applies to the use of GCLs in landfill capping systems. The necessary cover thickness will be less with a GCL; meaning: more containment reserved for waste burial. And the simplicity of installation—no need for generators or welding machines—also assists with safety requirements for such sites.
The sealing of dykes and dams is another interesting application to which GCLs are and have been applied to great economic success, especially where there is a local shortage of natural sealing material with a low hydraulic conductivity. The Sainte-Marguerite Dam in France is an exemplary case. The 42-year-old, 20m-high structure was lined with Bentofix GCL as the primary watertight barrier.
The dam’s cross section reveals some interesting aspects of the project’s scope and hints at the degree to which geosynthetics may aid this piece of the water management field:
• Foundation of 20m layer of compacted coarse sand
• Watertight trench with a maximum depth of 65m
• Sealing of the slope with Bentofix
• One metre of protection backfill in two layers of sand and gravel and stones
For other instructive water management applications, NAUE does not need to look outside of Germany, where the devastating flooding of 2002 has led to various dyke construction projects. A basic “three-zone dyke” principle is guiding the refurbishment: a barrier, dyke core and a down-stream load filter. Bentofix GCL has been the choice for several hundred thousand square metres of up-stream barriers: it is a very cost-effective alternative to a 60cm clay layer.
More Growth to Come
The advantages for GCLs are many. In addition to the aforementioned ease of installation and long-term performance, NAUE has found that truly outstanding sealing properties (k < 5 x 10E-11 m/s) can be engineered, and the ability to install these products in all weather conditions has only expanded the scope of what can be done.
As can be seen, Bentofix is an extremely versatile clay-based lining product. Once hydrated it is an effective barrier against liquids, vapours and gases.
With many years of successful installations, the range of Bentofix applications is virtually limitless; waste and contaminated soil caps; landfill base liners; gas and vapour seals; surface impoundment liners; secondary containment; dams, canals and water courses; tailings containment; groundwater protection; sorptive barriers; vertical barriers; waterproofing; and others.
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NAUE Receives IGS Corporate Award for Excellence
10 September 2008 – During the opening banquet of EuroGeo 4, the Fourth European Conference on Geosynthetics, in Edinburgh, Scotland, the International Geosynthetics Society (IGS) awarded NAUE GmbH & Co. KG its highest award, an IGS Award, for overall excellence. The award recognizes NAUE’s... read more
NAUE Receives IGS Corporate Award for Excellence
10 September 2008 – During the opening banquet of EuroGeo 4, the Fourth European Conference on Geosynthetics, in Edinburgh, Scotland, the International Geosynthetics Society (IGS) awarded NAUE GmbH & Co. KG its highest award, an IGS Award, for overall excellence. The award recognizes NAUE’s numerous manufacturing innovations and contributions to the field of geosynthetic engineering.
This is the second IGS Award for NAUE this year. In March, the company was recognized for its 20+ years of membership in the IGS, which itself is celebrating its 25th anniversary.
Many of NAUE’s significant achievements have involved geosynthetic clay liners (GCLs), a major class of barrier geosynthetics. GCLs are used in critical infrastructure installations such as landfill lining and capping, tunnel sealing, and dam and canal improvement.
NAUE discovered the needle-punch method of nonwoven geotextile manufacturing in 1988, a process that revolutionized the field. The advance enabled not only the rapid, safe production of GCLs but efficient shipping of GCLs in rolls. Also of note, the previously low friction coefficient of the sought-after clay used in GCLs—bentonite—ceased to be of concern because this new method of manufacturing transferred the shear stress from the clay to the highly engineered geotextile to which the bentonite had been bonded.
In addition to the manufacturing advances, NAUE’s research and installations around the world have also benefitted the entire geosynthetic engineering community. Key developments include self-sealing overlaps in GCL panels, underwater installations with GCLs and sandmats, and landfill capping.
ABOUT NAUE
NAUE GmbH & Co. KG, an ISO 9001 certified group of international companies, manufacturers geotextiles, geomembranes, GCLs, geogrids, drainage and erosion control materials for all applications. NAUE also offers product development and geotechnical advice to assist with the most challenging engineering projects. The company’s global specialties include: filtration, drainage, reinforcement, containment and erosion control landfills, groundwater protection, civil engineering, tunneling, waterproofing and hydraulic engineering.
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Court of appeal Judgement Approves ‘‘Piggybacking’’
On 20th December 2007, the court of Appeal in the case of E.A.v Antiwaste Ltd EWEA CW 1377, overturned the EA’s decision to refuse to consider permit applications for Landfills that piggyback onto existing closed landfill cells.
Antiwaste made the application for two Landfill... read more
Court of appeal Judgement Approves ‘‘Piggybacking’’
On 20th December 2007, the court of Appeal in the case of E.A.v Antiwaste Ltd EWEA CW 1377, overturned the EA’s decision to refuse to consider permit applications for Landfills that piggyback onto existing closed landfill cells.
Antiwaste made the application for two Landfills in Norfolk, the EA rejected the application. Before appealing the two parties agreed to go to the High Court to resolve the interpretation of the legislation.
1. Can a PPC permit be granted for a ‘Piggyback’?
2. Where the permit must be issued for the new cell and closed cell together, must a permit be refused where the closed cell is responsible for discharges of harmful substances into the groundwater and the two cells together cannot be made to comply with regulatory requirements.
The high court held that ‘Piggybacking’ cells can be lawfully granted permits, but not where a discharge would continue from the old cell as that would amount to permitting the existing discharged. Both parties appealed.
Appeal Decision.
The court of Appeal upheld the decision of the high Court that a permit can be lawfully granted to a piggyback cell. It was held that both the closed cell and the new cell are technical units separately carrying out appropriate activities.
As regards the groundwater issue, the Court of Appeal quashed the High Court’s decision suggesting that discharges from closed cells were not directly or indirectly related to the new cell and should not be considered in the application.
Although this is not necessarily a go ahead for all ‘Piggybacking’ applications it is now possible in principle with the right design.
NAUE can offer a full design service for the ‘Piggybacking’ of landfills. The biggest issues is designing the liner system over old waste so that the HDPE liner is not compromised. This can be done with the correct design utilising NAUE’s geogrid Secugrid® available in strengths from 20kN/m to 40kN/m. along with NAUE’s GCL Bentofix®, HDPE, Carbofol®, geotextiles Secutex® and our geodrain Secudrain®, NAUE can design and supply the full liner system to satisfy the technical requirements of ‘Piggybacking’, landfills. For more information on ‘Piggybacking’ and the services NAUE can supply please contact Chris Quirk (cquirk@naue.co.uk) or Angus Hamilton (ahamilton@naue.co.uk).
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RECOMMENDATIONS FOR LEACHATE DRAINAGE BLANKET LAYERS
On the 23 April 2007 the EA completed a guidance document relating to Leachate drainage Aggregate. This document meets the requirements of the Landfill Regulations 2002.
In summary, the attached document details drainage layer aggregate thickness, grading and pipe... read more
RECOMMENDATIONS FOR LEACHATE DRAINAGE BLANKET LAYERS
On the 23 April 2007 the EA completed a guidance document relating to Leachate drainage Aggregate. This document meets the requirements of the Landfill Regulations 2002.
In summary, the attached document details drainage layer aggregate thickness, grading and pipe network requirements within the basal layer of new landfill cell constructions.
It has been a requirement of the Landfill Regulations that basal aggregate drainage blankets should be a minimum of 500 mm in thickness, graded at a 20 / 40 mm aggregate.
This new guidance allows for a 300 mm thickness of a drainage blanket, where a 10 / 20 mm graded aggregate is used, subject to the following requirements:
• The drainage blanket must include a robust, well engineered slotted / perforated pipe network (in accordance with the attached guidance).
• The installation of a Filter Geotextile to be placed on top of the 10 / 20 mm graded drainage aggregate (point 3, first page of attached guidance).
With the acceptance by the EA of allowing a finer grade aggregate, at a reduced thickness, comes potential cost saving opportunities in that a lighter weight protection geotextile can also be put forward for installation below the aggregate, subject to cylinder test approval.
With the acceptance of a 300 mm drainage blanket, subject to the conditions above, also benefits Landfill Operators, as it allows for an extra 200 mm of void space across the base of the landfill cell.
Naue Geosynthetics are able to offer our Secutex 301 GRK 5 (which FULLY complies with the filter geotextile EA Specification, to be placed on top of the drainage aggregate.
These new developments allow greater flexibility within the design of the drainage blanket, allowing for a more cost effective approach.
We would be happy to discuss any of the above details further by phone or meet with yourselves should you require any further assistance. Please do not hesitate to contact Angus Hamilton or Jake Stoyle regarding this new guidance.
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RECOMMENDATIONS FOR THE USE OF TYRES FOR LEACHATE DRAINAGE BLANKET LAYERS
Please find details below regarding new Environment Agency (EA) Guidance for the use of used whole and shredded tyres as an engineering material replacement for drainage aggregate within the drainage blanket.
The generic term for such materials is “Used Tyre Derived Aggre... read more
RECOMMENDATIONS FOR THE USE OF TYRES FOR LEACHATE DRAINAGE BLANKET LAYERS
Please find details below regarding new Environment Agency (EA) Guidance for the use of used whole and shredded tyres as an engineering material replacement for drainage aggregate within the drainage blanket.
The generic term for such materials is “Used Tyre Derived Aggregate Replacements” or UTDAR.
On the 20 June 2007 the EA completed the attached guidance document relating to Leachate drainage Blankets. This document will be followed by further guidance, upon EA review, in the future. However, the current guidance attached is designed to provide regulatory consistency in terms of design and construction.
In summary, the attached document details the following issues regarding UTDAR drainage blanket usage:
• The initial landfill assessment and hydrological / gas risk assessment requirements for the use of UTDAR systems.
• Potential alterations to the basal and side slope engineering designs to incorporate UTDAR systems.
• Tyre compressibility tables for whole baled and shredded tyre to achieve 500 mm equivalence thickness under load.
• Hydraulic Conductivity calculations and drainage installation requirements for non tyre elements regarding drainage pipe networks and a side slope drainage system.
As part of the attached guidance for UTDAR systems, for Shredded tyre applications, it is recommended that the drainage blanket is overlain with a filter geotextile (see table presented on page 5 of attached guidance).
Naue Geosynthetics are able to offer our Secutex 301 GRK 5 (Data sheet attached) which FULLY complies with the filter geotextile EA Specification, to be placed on top of the drainage blanket.
Another part of the attached guidance for UTDAR systems, for Whole tyre applications, it is recommended that the drainage blanket is overlain with a geogrid to resist uplift forces during the period of greatest waste settlement, to prevent upward migration of tyres.
Naue Geosynthetics have extensive experience regarding the use of geogrids for the above application, specifically in the UK with our Secugrid 30/30 Q1 (Data Sheet attached) being used at a hazardous Landfill site in the West Midlands as a test site for the guidance.
We would be happy to discuss any of the above details by phone or meet with yourselves should you require any further assistance. Please do not hesitate to contact Angus Hamilton or Jake Stoyle regarding this new guidance.
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The newest PDF documents from NAUE UK |
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| Case Study Yarrow Road |
| Work to turn an unusable sloping site at Yarrow Road in Poole, Dorset, into a level area suitable for commercial and retail development, has included the use of Secugrid geogrid products from NAUE Geosynthetics. Read more in the download article.
Case Study Yarrow Road |
Download [PDF 2 MB]
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| New geosynthetics invention for railroad construction |
| Upgrading work on the Bucharest to Constanta section of the Romanian Railway has included extensive use of materials from NAUE GmbH & Co. KG. This section of line is about 225km long with work being carried out in two phases, and is part of the 4th Pan European Corridor which measures some 1,395km in length. |
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Download [PDF 2.34 MB]
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| Bentofix GCL seals landfill Black Devon |
| With its close proximity to the River Forth, the Black Devon landfill site restoration works was faced with the problem of precipitation percolation – overcome with the specification of
Bentofix BFG 5000 from NAUE Geosynthetics. |
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Download [PDF 0.46 MB]
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| Environment Agency Landfill Site Trial - Success with NAUE’s New Lightweight Geotextiles |
| In the summer of 2007 we saw the launch of NAUE´s new, lightweight Secutex® Geotextile product range. One of these new products, NAUE´s Secutex® 301 GRK 5 C, was subject to an Environment Agency Site trial in which integrity of the product, and its ability to perform in the field as a protector, was assessed.
Read more in the PDF file. |
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Download [PDF 0.71 MB]
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| NAUE´s Geosynthetic Portfolio |
| NAUE GmbH & Co. KG, an ISO 9001 certified group of international companies, manufacturers geotextiles, geomembranes, GCLs, geogrids, drainage and erosion control materials for all applications. NAUE also offers product development and geotechnical advice to assist with the most challenging engineering projects. The company’s global specialties include: filtration, drainage, reinforcement, containment and erosion control landfills, groundwater protection, civil engineering, tunnelling, waterproofing and hydraulic engineering. Read in the download file about the geosynthetic portfolio from NAUE. |
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Download [PDF 0.29 MB]
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| Watertight argument for holding Lagoon |
| Currently being constructed on the site of the old Hatfield Colliery that closed in 2003, Hatfield power Park features a water holding lagoon that makes use of Bentofix NSP 4900 from Naue Geosynthetics. Situated a few miles North East of
Doncaster, this mine is the subject of an ambitious plan to construct a 430MW Coal Integrated Gasification Combined Cycle Power
Generation Plant. Coal, water slurry and oxygen will be pumped into a ‘gasifier’ where it will be converted into a gas known as Syngas, before being treated for impurities. It will then be burnt in
place of natural gas. Chemical byproducts from this process can be sold to pharmaceutical companies and other industries. |
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Download [PDF 1.89 MB]
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| Secugrid®’s Supermarket Sweep |
| Real value for money was one of the features in the NAUE Geosynthetics specification for geogrids
at a new distribution centre for Tesco. Situated on the dockside at Teesport on the North East coast of England, the new Tesco distribution centre is
set in 25ha of land and is being constructed with the help of Secugrid® flat geogrids from NAUE Geosynthetics. This massive and challenging development involve the construction of a 30,000m2, 33m tall high bay and a 60,000m² lower profile low bay storage building.
Download the PDF for more information |
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Download [PDF 1.02 MB]
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| New Royal Mail Distribution Centre secured with Secugrid® |
| Creation of a new Royal Mail distribution centre in
Warrington, seen as key to the postal service
operator’s restructuring plans, has been made possible thanks to the ground engineering expertise of NAUE Geosynthetics. The 179,000sq ft facility is located at South 62 in Winwick Quay, Warrington – just a couple of miles from Naue’s
UK headquarters. The depot occupies an 11 acre site suitable for handling the Royal Mail’s fleet of delivery vehicles and stands on Secugrid® soil reinforcement.
More information in the PDF File. |
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Download [PDF 1.18 MB]
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| Cell Structure Secured |
| Accommodating over 1000 tonnes of waste on
a daily basis, Path Head Quarry in Blaydon, Tyne
and Wear is a state-of-the-art landfill facility that is making extensive use of technology and products from NAUE Geosynthetics. With Newcastle on one side and Gateshead on the other, the site was
originally developed four years ago and is constantly being upgraded as new cells are developed within it to dispose of waste. In the second cell development, NAUE Geosynthetics
combined expert knowledge and a dedicated product range to assist with the rigidity and protection of the landfill batters on the site.
The solution was offered in the form of GCL Bentofix® NSP 4300 and 2mm Carbofol® HDPE MegaFriction GM13 geomembrane.
Read more in the PDF file.
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Download [PDF 3.44 MB]
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