Alpharetta, GA, United States
Alpharetta, GA, United States

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Sun X.,University of Kansas | Han J.,University of Kansas | Kwon J.,Tensar International | Parsons R.L.,University of Kansas | Wayne M.H.,Tensar International
Geotextiles and Geomembranes | Year: 2015

The performance of geogrid-stabilized unbound aggregate courses over weak subgrade has been studied over the years by many researchers. Previous studies reported that the inclusion of geogrid reduced the permanent deformation on the surface and the vertical stress on the subgrade. This study evaluated the influence of the geogrid on the resilient deformations and radial stresses of the aggregate bases and subgrade. A cyclic plate load was applied through a 0.3-m diameter plate on Kansas type aggregate bases with thicknesses of 0.15, 0.23, and 0.30m. To investigate the effect of the load intensity on pavement response, the plate load magnitude was increased from 5 to 50kN with an increment of 5kN. Displacement transducers were installed at different distances to monitor the permanent and resilient deformations on the surface and subgrade. Horizontally and vertically placed pressure cells monitored vertical and radial stresses within the base and subgrade layers. Test results indicate that the inclusion of a geogrid reduced both the base course and subgrade permanent deformations and changed the radial stress distributions within the base course and subgrade. The geogrid stabilized sections showed greater resilience than the unstabilized sections. The geogrid restrained and recovered the lateral deformation of the aggregate while the unstabilized sections failed due to the progressive lateral displacement. © 2015 Elsevier Ltd.

The introduction of the Construction Products Regulation (CPR) across all EU countries is intended to remove local barriers to trade for competing products. The CPR encourages specifiers, particularly public bodies and national entities, to specify products needed to perform a particular function using the performance characteristics defined in the relevant harmonised standards. While encouraging competition, this may have the effect of discouraging innovation, particularly iterative development of products. To overcome the possible stifling of innovation the European Commission has built a 'route for innovation' into the CPR. This route, The European Technical Approvals (ETA) process, has been utilised by at least one European geosynthetics manufacturer. This paper examines the reasons behind the decision by Tensar International to apply for an ETA for their hexagonal structure geogrids and looks in detail at the process of applying for an ETA, encouraging other geosynthetic manufacturers to take this route.

Doulala-Rigby C.,Tensar International
Design and Practice of Geosynthetic-Reinforced Soil Structures | Year: 2013

Engineers are continually faced with maintaining and developing airfield infrastructure with limited financial resources. Traditional airfield pavement design and construction practices require high-quality and often expensive and non-sustainable materials to fulfil the high construction standards. In many areas of the world, quality materials are unavailable or in short supply. Coupled with the recent emphasis on sustainability and the scarce financial resources due to the recent global recession, engineers are seeking alternative designs and construction methods that can utilise marginal or recycled materials and innovative design practices. Designing with geosynthetics allows a variety of innovative approaches for airfield pavement construction and maintenance. Geosynthetics include a wide variety of products composed of polymers which have been developed to enhance geotechnical and transportation projects offering sustainable solutions at considerable lower cost than traditional methods. Airfield pavement construction in the UK began around 1937 in the UK without a proven design method. It was only in early 1945 that the first design method was published by the UK Defence Estates. This method was essentially empirical, based largely on experience gained constructing some 450 airfields between 1937 and 1945. Since then, airfield design has progressed enormously and extensive research programmes have been conducted by the UK Defence Estates, U.S. Army Engineer Research and Development Centre (ERDC) and other nonmilitary agencies worldwide to develop design and construction guidance for the construction of airfield pavement systems, incorporating the use of geosy nthetics This paper outlines the design requirements and guidance for the construction of flexible airfields in the UK, introducing the benefits of including geosynthetics as a key part of the solution. A variety of case studies are also presented, covering a wide range of geosynthetic applications from the mechanical stabilisation of sub-grade and sub-base layers including projects involving construction of airfield runway extensions over saturated, clayey/peaty soils and also reflective cracking remediation to asphaltic concrete layers.

Dixon J.H.,Tensar International | Hall C.,Tensar International
Proceedings of the Institution of Civil Engineers: Engineering Sustainability | Year: 2010

This paper discusses the development and sustainability benefits of using geogrids in ground and reinforced soil projects. It also describes how the latest advances in geogrid technology have delivered significant savings (up to 50%) in carbon dioxide emissions, as well as cost and time savings, when compared with more conventional stabilisation techniques.

Jas H.,7asConsult BV | Stahl M.,Schussler Plan Ingenieurgesellschaft mbH | Te Kamp L.,ITASCA Consultants GmbH | Konietzky H.,TU Bergakademie Freiberg | Oliver T.,Tensar International
Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015 | Year: 2015

This paper presents a procedure to simulate and analyse the behaviour of a geogrid embedded between a weak sub-grade and granular material and loaded with a passing wheel-load using PFC3D based on the specifications and under special consideration of the grain-size distribution, initial relative density, normal stress state as well as sample installation. The aim of this simulation is to learn how triaxial geogrids behave and what parameters are imperative for their fitness for use. Apart from the actual movements of the granular particles, model analysis of the geogrid behaviour and load dissipation is presented to understand the critical characteristics of triaxial geogrids. © The authors and ICE Publishing: All rights reserved, 2015.

Jas H.,7asConsult BV | Stahl M.,Schussler Plan Ingenieurgesellschaft mbH | Te Kamp L.,ITASCA Consultants GmbH | Konietzky H.,TU Bergakademie Freiberg | Oliver T.,Tensar International
Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015 | Year: 2015

The paper describes how numerical and tests have been conducted to reproduce the behaviour of geogrids embedded in granular material under special consideration of the grain-size, relative density, normal stress and installation. Granular soils and geogrids are simulated depending on a specific particle and parallel bond model and calibrated to the results of laboratory tests. An analysis is given of the actual deformations and stresses within the granular material during and after the loading The above knowledge and experience has been used to simulate a wheel passing over a stabilised sub-base on a weak sub-grade. The ultimate aim of this research is to learn how geogrids behave and what parameters are imperative for their fitness for use. © The authors and ICE Publishing: All rights reserved, 2015.

Brown D.N.,Tensar International | Liew W.,Tensar International
Geosynthetics | Year: 2012

Mechanically-stabilized earth (MSE) berms are increasingly utilized by landfill owners to efficiently create usable airspace for waste disposal. Since their inception in the late 1980s, MSE berms at landfills have contributed to sustainability by simultaneously allowing geometric maximization of the volume of usable airspace within a given permitted footprint while minimizing the carbon footprint of the berm construction operation by eliminating or delaying the need to site and construct new waste containment facilities and by requiring less time and resources to construct vs. conventional containment berms. This article will offer a brief historical perspective on MSE berms in waste containment facilities and establish prevalence of their use by solid waste landfill owners, identify the benefits of MSE berms relative to sustainability, and, finally, will quantify conceptually the benefit, in terms of carbon footprint, of an MSE berm vs. a traditionally constructed, unreinforced one. Future considerations of MSE berms at landfills that could further sustainability are also discussed.

Wayne M.H.,Tensar International
Geotechnical Special Publication | Year: 2016

This paper examines the use of geogrids to effectively stabilize particles and form a mechanically stabilized layer or layers. Historically the geosynthetic and geotechnical community have referred to the use of geogrids for reinforcement. This was born out of their widespread use in wall and slope or grade separation structures. However, when these materials are utilized in transportation applications they provide the primary function of stabilization. This paper will highlight recent modelling, laboratory and full scale field testing which demonstrate that this is in fact the case. © ASCE.

A geogrid reinforced compactable asphaltic concrete composite includes a bottom layer, a first compacted layer of asphaltic concrete, a triaxial geogrid, and a second compacted layer of asphaltic concrete. The first layer and the second layer each include an aggregate having sharp, compound edges, which when mixed in asphaltic cement, create an aggregate interlock within the triaxial geogrid that provides strength to a paved surface. As a result of the triangular aperture geometry of the triaxial geogrid, the geogrid provides an asphalt lateral confinement zone within the composite. The zone allows for the formation of transverse hairline cracks as stresses on the composite necessitate. At elevated temperatures, the asphaltic cement softens and flows into the small transverse cracks, thus enabling the asphalt mats to substantially reseal themselves.

Market Research Report on Epichlorohydrin market 2016 is a professional and in-depth study on the current state of the Epichlorohydrin worldwide. First of all,"Global Epichlorohydrin Market 2016" report provides a basic overview of the Epichlorohydrin industry including definitions, classifications, applications and Epichlorohydrin industry chain structure. The analysis is provided for the Epichlorohydrin international market including development history, Epichlorohydrin industry competitive landscape analysis.  This report "Worldwide Epichlorohydrin Market 2016" also states import/export, supply and consumption figures and Epichlorohydrin market cost, price, revenue and Epichlorohydrin market's gross margin by regions (United States, EU, China and Japan), as well as other regions can be added in Epichlorohydrin Market area. Major Manufacturers are covered in this research report are Sumitomo Chemical Solvay Aditya Birla Chemicals Spolchemie Osaka Soda Shandong Haili Chemical Industry Samsung Fine Chemicals Jiangsu Yangnong Chemical Group Hexion Tensar International This report studies Epichlorohydrin in Global market, especially in North America, Europe, China, Japan, Southeast Asia and India, focuses on top manufacturers in global market, with sales, price, revenue and market share. Then, the report focuses on worldwide Epichlorohydrin market key players with information such as company profiles with product picture as well as specification. Related information to Epichlorohydrin market- capacity, production, price, cost, revenue and contact information. Aslo includes Epichlorohydrin industry's - Upstream raw materials, equipment and downstream consumers analysis is also carried out. What’s more, the Epichlorohydrin market development trends and Epichlorohydrin industry marketing channels are analyzed. Finally, "Worldwide Epichlorohydrin Market" Analysis- feasibility of new investment projects is assessed, and overall research conclusions are offered.

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