TenCate Geosynthetics

Pendergrass, GA, United States

TenCate Geosynthetics

Pendergrass, GA, United States
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Timpson C.,TenCate Geosynthetics
Geotechnical Special Publication | Year: 2017

Recently the Environmental Protection Agency established national regulations for the safe disposal of coal combustion residuals (CCRs) from coal-fired power plants. These CCR byproducts, such as fly ash and bottom ash, can be a real challenge for both small and large facilities to remove and manage. The Environmental Protection Agency's comprehensive set of requirements addresses the risks from coal ash disposal like leaking of contaminants into ground water, blowing of contaminants into the air as dust, and the catastrophic failure of coal ash surface impoundments. Geotextile tube dewatering technology can provide a unique approach for the management of coal combustion residuals. By incorporating geotextile tube technology, coal-fired facilities can dewater and contain CCRs. This technology can be utilized in the operation of existing surface impoundments, efforts to beneficially use consolidated ash, and the continued operation of coal-fired operations by direct sluicing the daily flows from the plant into geotextile tubes. This paper will discuss several unique approaches involving the remediation or clean closure of surface impoundments, beneficial use of dewatered CCRs, and direct sluicing operations incorporating geotextile tube technology for the safe disposal of by-products from coal-fired power plants. © ASCE.

Timpson C.,TenCate Geosynthetics
Geotechnical Special Publication | Year: 2017

Recent storm events, such as the storms in the fall of 2009 and Superstorm Sandy in 2012, have eroded beaches and dunes in the downtown Montauk, NY area. The culmination of these storms have created a potentially imminent hazard that has left many commercial buildings along the shoreline vulnerable to damages from future storms. Beach and dune erosion caused by Superstorm Sandy has partially undermined several shorefront structures in downtown Montauk, leaving the area vulnerable to damage from future storms. A stabilization project was developed in cooperation with the Army Corps of Engineers, New York State Department of Environmental Conservation, and East Hampton, NY town officials. A unique component of this project was the use of modular geotextile containers instead of geotextile tubes for the core of the dunes. Geotextile containers can provide an alternative over traditional geotextile tubes; they are fabricated with high capacity seams to produce bag or pillow shaped containers. When filled with sand or other soils, the geotextile containers are used to construct revetments and other hydraulic structures such as filling in scour holes, closing breached dykes, and as basic armor units for erosion protection works. Geotextile containers are engineered to provide strength, durability, and soil tightness to perform during installation and during operational life. They are easy to use and can be rapidly mobilized if necessary for emergency works. This paper will discuss the material selection, development, construction, and installation of this stabilization effort utilizing geotextile containers for dune protection. © ASCE.

Perkins S.W.,Montana State University | Christopher B.R.,Christopher Consultants | Lacina B.A.,TenCate Geosynthetics | Klompmaker J.,BBG Bauberatung Geokunststoffe GmbH and Co.KG
International Journal of Geomechanics | Year: 2012

Mechanistic-empirical modeling and design solutions have been routinely used for conventional flexible pavements and have recently entered mainstream design practice through the issue of AASHTO design software. Recent work has been performed to incorporate mechanisms of base reinforcement with geosynthetics into mechanistic-empirical modeling and design. The purpose of this paper is to examine the use of this work for mechanistic-empirical modeling of reinforced unpaved roads by using the same model components used for paved roads and incorporating new components that account for the significant influence of pore-water pressure generation in the subgrade. Results from instrumented unpaved road test sections are used to calibrate and compare with the model predictions. The model provides reasonable predictions of rutting behavior for test sections where rut development is stable, where stable is defined as a rate of rutting that decreases with increasing traffic. The importance of excess pore-water pressure development in the subgrade is illustrated by the test sections and accounted for by the inclusion of steps in the model.© 2012 American Society of Civil Engineers.

Tschegg E.K.,Vienna University of Technology | Jamek M.,Vienna University of Technology | Lugmayr R.,TenCate Geosynthetics
Road Materials and Pavement Design | Year: 2012

Geosynthetic interlayers in asphalt systems have become a convenient technology for lifetime prolongation in road construction engineering. Durability and lifetime prediction analysis of such systems can be obtained by fatigue crack growth testing. In this paper, the fatigue crack growth properties of three different asphalt interlayer system groups with different interlayer functions: SAMI (=Stress Absorbing Membrane Interlayer), asphalt reinforcement and the combination of SAMI + asphalt reinforcement are reported. For comparison non-interlayer systems (reference) have also been tested. Instead of 3- or 4-point bending tests with beams, wedge splitting tests with drill cores from the field are used for analyzing the fatigue crack growth behaviour of these systems. Due to the temperature dependence of asphalt the tests have been performed in a climate chamber at -10°C, 0°C and +10°C. Crack growth propagation was determined visually. The results show that this new visual approach for evaluation of crack growth testing together with the wedge splitting test are practicable, reproducible and allow grading of geosynthetic asphalt interlayer systems. © 2012 Taylor & Francis.

Douglas R.A.,Golder Ltd. | Laprade R.,TenCate Geosynthetics | Lawrence K.,Golder Ltd.
Transportation Research Record | Year: 2015

The heaviest trucks serving shovel-and-truck mining operations have tripled in weight to more than 600 tonnes gross weight over the past 30 years. The design of haul roads to support these trucks is becoming ever more challenging. An additional problem is the huge demand for aggregates with which to construct these thick, wide roads. In this study of the problem, a numerical modeling investigation was performed for a 300-tonnc-design axle on a granular pavement consisting of a capping layer, base, and subbase (0.5, 1.0, and 1.5 m thick, respectively). Conventional linearly elastic analyses and analyses not permitting tension were carried out. While the results of the conventional elastic analysis permitting tension had indicated that there was no reinforcing effect with these geotextiles, the results of the no-tension analysis indicated a significant reinforcement effect attributable to the inclusion of high-strength geotextiles in the cross section. The results bring into uues-tion the use of analyses permitting tension in the granular pavement materials.

Jamek M.,Vienna University of Technology | Tschegg E.K.,Vienna University of Technology | Lugmayr R.,TenCate Geosynthetics
Fatigue and Fracture of Engineering Materials and Structures | Year: 2012

Geosynthetic interlayers in asphalt systems have become a convenient technology for lifetime prolongation in road construction engineering. Established testing methods for characterizing construction materials can be used to describe and evaluate these innovative systems. This study compares three groups of asphalt interlayer systems (stress absorbing membrane interlayer = SAMI, asphalt reinforcement, SAMI + asphalt reinforcement) represented by 10 different geosynthetic interlayers in terms of crack growth resistance and strength. The results will be presented in relation to asphalt reference systems without interlayer. The mechanical and fracture-mechanical properties were determined by means of the wedge splitting test (WST) according to Tschegg and partially by the pull-out test. Due to temperature dependences of the material properties of asphalt, the tests have been performed at -10 °C, 0 °C and +10 °C specimen temperature. © 2012 Blackwell Publishing Ltd.

Plaut R.H.,Virginia Polytechnic Institute and State University | Stephens T.C.,TenCate Geosynthetics
Geotextiles and Geomembranes | Year: 2012

Geotextile tubes are often used to dewater contaminated or other material. Slurry is pumped into the tube, some of it permeates out through the fabric, and some or all of the particles in the remaining slurry consolidate at the bottom of the tube. This process is often repeated a number of times until the consolidated material (fill) takes up most of the volume in the tube. Interface friction between the fill and the tube may cause a significant increase in the maximum tension in the tube, and may induce failure by tearing. In the analysis of this system here, the tube is assumed to be long and a cross section is analyzed. The tube material is assumed to be inextensible with no bending stiffness, the tube weight is neglected, the foundation is rigid and horizontal, the slurry is modeled as a liquid, and friction acts between the fill and the tube. The relevant parameters are the tube circumference and height, the specific (unit) weights of the slurry and the fill, the height of the fill, and the coefficient of friction. The equations are derived and solved numerically, and the effects of the parameters on the tube behavior are investigated. Friction has a negligible effect on the cross-sectional area. However, the maximum tension, occurring at the top of the tube, increases as the coefficient of friction increases, and can be significantly greater than the value predicted by standard procedures that neglect friction. © 2012 Elsevier Ltd.

Lacina B.A.,TenCate Geosynthetics
American Association of Textile Chemists and Colorists International Conference 2010 | Year: 2010

The discussions in this document have conclusively shown that geotextiles are a time-proven and cost-effective method for providing a durable solution for long-term and short-term roadway performance. The proper geotextile can reduce long-term maintenance costs for a permanent roadway, as well as reduce up-front construction material costs, if so desired. We have also shown that subgrade stabilization using geotextiles can significantly reduce undercut requirements for soft subgrade soils and allow site access for construction equipment where it would otherwise be impossible. With the very high benefit to cost ratio that geotextiles provide in roadway applications, we have to wonder why they are not routinely used in all roadway construction. Based on the readily available information from credible sources such as FHWA, AASHTO and profuse research publications, it seems that owners are throwing their hard-earned money away by not using geotextiles in construction of their roadways. In today's economic climate, cost savings and project life-cycle improvement are imperative, meaning geotextiles should be used in every roadway project. By not using the available geotextile knowledge base, we are not providing the public the best possible and most economic roadway construction solutions.

Lostumbo J.M.,TenCate Geosynthetics
Geotechnical Special Publication | Year: 2010

Yeager Airport was constructed atop mountainous terrain near Charleston, WV in the 1940's. Construction consisted of excavating 7 hilltops and filling surrounding valleys to create a flat site for the runways. Due to this dramatic terrain, development to meet FAA safety regulations was extremely difficult, and some concessions were allowed. However, the airport recently needed to extend Runway 5 approximately 150 meters (500 feet) in order to meet current FAA safety regulations. Bridges, walls and reinforced slopes were evaluated as options to extend the runway. The geosynthetic reinforced slope option provided the most economical alternative; plus, the "green" faced system allowed for a more aesthetically pleasing alternative to blend into the surrounding green hills. The reinforced structure is a 1H:1V (45 degree) geosynthetic reinforced steepened slope, 74 meters (242 feet) high. This is the tallest geosynthetic reinforced green faced 1H:1V slope constructed in the United States. © 2010 ASCE.

Artieres O.,TenCate Geosynthetics
Optics InfoBase Conference Papers | Year: 2010

A textile fibre optics composite sensor aims to monitor geotechnical structure and to generate early warnings if it detects and localizes the early signs of malfunctioning, such as leaks or instability. This is a customizable solution: Fiber Bragg gratings, Brillouin and Raman scattering can be built into this system. These technologies measure both strain and temperature changes in soil structures. It can provide a leak and deformation location within accuracies resp. 0.02% and 1 l/min/m. © 2010 Optical Society of America.

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