BBG Bauberatung Geokunststoffe GmbH and Co. KG

Espelkamp, Germany

BBG Bauberatung Geokunststoffe GmbH and Co. KG

Espelkamp, Germany
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Horvat F.,Széchenyi István University | Klompmaker J.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
10th International Conference on Geosynthetics, ICG 2014 | Year: 2014

The stabilisation and reinforcement of crushed stone aggregate in infrastructural applications using geogrid reinforcement is based on the phenomenon called the "interlocking effect". Through shear interaction of the aggregate with the geogrid, the aggregate is laterally restrained and tensile forces are transmitted from the aggregate to the geogrid. This interaction helps reducing lateral movement of the aggregate and optimises road/track performance. It is well known that this strengthening effect depends on several influencing factors. It is still difficult to quantify the true reinforcement efficiency with regard to the limit of the lateral restraint effect (or confining resistance) over the depth of the aggregate layer being placed on top of the geogrid. To be able to quantify the confining resistance efficiency of geogrids over the depth of the installed aggregate layer a laboratory test was developed (Multi-level shear box test) which allows measuring the shear resistance as a function of the distance from the geogrid layer (in vertical direction). This paper will describe the methodology of the so called "Multi-level shear box test" as well as the results of the confinement efficiency of different type geogrids in combination with railway ballast.

Von Maubeuge K.,NAUE GmbH and Co. KG | Egloffstein T.,Czurda und Partner MbH | Vollmert L.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability | Year: 2015

Worldwide more and more road noise and view-blocking barriers are being built along roads, motorways and railway lines, with a core that is made from mineral waste. This waste material can be in the form of slag, ash from municipal waste incineration plants or contaminated soil from the rehabilitation of contaminated sites, residue from construction waste recycling or industrial processing residue (slag, ash, foundry sands, conditioned sludges etc.). These waste products have to meet certain environmental-chemical requirements and must be provided with a surface sealing for groundwater protection. This sealing system can be designed as a mineral sealing (compacted clay liner, CCL) or it can be made of geosynthetic material (geosynthetic clay liners GCL, geomembranes). The commonly required drainage layer can also be of gravel or crushed stone or it can comprise geosynthetic materials (geosynthetic drainage system). Many noise barriers have relatively steep slopes because there is limited space and the higher the barrier and the steeper the slope the greater the noise protection. The sealing and drainage systems therefore frequently require reinforcement in the form of geogrids to ensure slope stability.

Klompmaker J.,BBG Bauberatung Geokunststoffe GmbH and Co. KG | Pohlmann H.,NAUE GmbH and Co. KG
GA 2012 - 5th Asian Regional Conference on Geosynthetics: Geosynthetics for Sustainable Adaptation to Climate Change | Year: 2012

The reduction of energy consumption and emission of climate gases like CO2 is a big challenge for the global industry. Practical greenhouse gas reduction actions can help reducing the risks from a warming climate and deliver considerable economic benefits. Economic and ecological advantages of construction methods using geosynthetics are already well known. The reduction of excavation masses and truck transport in areas with soft soil conditions by using geogrid soil reinforcement technology is only one of many examples. This paper will illustrate the potential in reduction of the carbon footprint by comparing and evaluating the cumulated energy demand (CED) and the climate related CO2 emissions for the complete life cycle of the used building materials for conventional construction methods vs. geosynthetic construction alternatives in infrastructural applications.

Heerten G.,RWTH Aachen | Heerten G.,NAUE GmbH and Co. KG | Werth K.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
Proceedings of the Institution of Civil Engineers: Ground Improvement | Year: 2012

Following past flood disasters in Europe, safe and modern levee cross-sections have been implemented using geosynthetics. The use of filter nonwovens between the levee core and drainage and up-lift ballast berms at the inner levee embankment, or the arrangement of geosynthetic clay liners (bentonite mats, GCLs) at the outer levee embankment are included along with well-established alternatives in current guidelines. The efficiency of stabilisation measures with geosynthetics integrated into the levee has been investigated and the high stability of these construction methods in the case of overtopping has been documented. Erosion at the inner levee embankment and unexpected levee failures can be prevented or delayed. The likelihood that such levees will break is minimal because the earthen levee cannot be eroded. This approach to dramatically improving the safety of levees by integrating geosynthetics into the levee cross-section could significantly reduce danger and potential flood damage in many parts of the world.

Maubeuge K.V.,NAUE GmbH and Co. KG. | Klompmaker J.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
Geotechnical Special Publication | Year: 2011

The reinforcing properties (e.g. bars, straps, filaments), the geogrid properties, the thickness of the soil or the soil type and the durability properties of a geogrid greatly influence the construction project scope, design, product selection and expected service life in a road construction. When a geogrid is inserted into a base course layer, there are several properties which affect the long-term performance of the design. It is not only a single property such as the stiffness and strength of a geogrid. At the end the integrity of the installation needs to be protected in all directions. Therefore even if the general application of a geogrid in a base course sounds simple it is a complex summary of properties which work hand in hand. This paper will list mechanical properties of geogrids used in base courses of flexible pavements, which are currently considered to provide benefit for the performance of this composite layer. Furthermore a new design method for geosynthetic reinforced flexible pavements, the so called mechanistic-empirical design method will be described and experimental results for a laid and welded geogrid and geocomposite will be presented. The results will finally be compared to the Giroud & Noiray (1981) design method. © ASCE 2011.

Heerten G.,NAUE GmbH and Co. KG | Werth K.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
WasserWirtschaft | Year: 2013

The use of geosynthetics as filter and drainage layer is increasing worldwide. Based on project specific requirements corresponding products have to be designed and selected, but also be installed without damage, because a potential puncture of geotextiles makes the filter design needless. Analogies for the design of grain filters and geosynthetic filters are presented as well as robustness criteria for a safe installation of geotextiles. In the 80 m high rockfill dam Frauenau in Germany geotextiles have been applied in a safety-relevant position in the core of the dam. The dam is in successful operation and condition since about 30 years with long-term monitoring showing very little leachate in the control gallery.

Psiorz C.,BBG Bauberatung Geokunststoffe GmbH and Co. KG | Klompmaker J.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
10th International Conference on Geosynthetics, ICG 2014 | Year: 2014

Geosynthetic reinforcement products used for paved and unpaved roads or traffic areas function on the basis of two main mechanisms that contribute to their performance. Shear loads developing in unbound granular layers as a result of traffic loading are transmitted from the base aggregate to the geosynthetic as a result of frictional interaction or via the so called interlocking effect. Due to the product structure of flexible and woven materials the interlocking component is relatively weak compared to stiff and rigid geogrid products. Thus the load absorption functions on the basis of frictional interaction and the membrane effect. Stiff and rigid geogrids with high aperture stability can generate optimal interlocking with the granular base course material. The granular material is laterally restrained when stressed by traffic loading. This effect is called stabilisation. What further characteristics are required to generate stabilisation? It is not only the documented rigidity of the apertures; it is much more, which will be explained in greater detail in this paper.

Lenart S.,Slovenian National Building And Civil Engineering Institute | Klompmaker J.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
10th International Conference on Geosynthetics, ICG 2014 | Year: 2014

As a result of increasing railway traffic, speed and axle loads, existing railway tracks, especially those which are built on soft ground, often show signs of distress and settlements. These have a serious influence on the safety and economy of existing railway lines. As an economic measure for the rehabilitation and/or upgrading of existing railway lines, geogrid or geocomposite products for reinforcement, filtration and separation have successfully been installed in many projects and decisive product properties for these materials have been specified by Railway Authorities. The geogrid reinforcement restrains lateral deformations of the ballast/sub-ballast through shear interaction, which reduces permanent horizontal strains and vertical stresses in the long run. The geotextile component, as separation and filtration layer, prevents mixing of the often fine subgrade (clay/silt) with the coarse aggregate, which prevents distortion of the whole track superstructure. The paper presents results from 5 years of field measurement of a rehabilitated railway section (Poljcane - Dolga Gora, Slovenia) with geogrid reinforced sub-ballast layer on soft soil. In addition to this results from 2 years of field measurement of a rehabilitated railway section (Sava, Slovenia) with geogrid reinforced ballast layer on soft soil are presented and compared to an unrein-forced section.

To improve the mechanical performance of unbound granular layers in road constructions, geosynthetics are used for the function of, amongst others, reinforcement by geogrids. As far as the geogrids are characterized by a suitable mechanical specification, the granular layers are reinforced even at very low deformations. For verbal and technical clarification the stabilization effect is understood as part of the reinforcement function. Tenders, bids, acceptances and contracts for products shall be worked out based on technical regulations and CE-marking documents for reinforcing products with slight additions, taking low strain and serviceability limit states into consideration. In opposite to layers mixed with binders, the water permeability is not influenced by this measure, and geogrid reinforced layers can be characterized by extraordinary ductility. ©2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Herold A.,IBH Herold and Partner Ingenieure | Vollmert L.,BBG Bauberatung Geokunststoffe GmbH and Co. KG
Design and Practice of Geosynthetic-Reinforced Soil Structures | Year: 2013

During the construction of the B6n trunk road near Bernburg in the state of Saxony-Anhalt, the opportunity was taken to carry out a full-scale trial on a GRE retaining wall. In the course of the project, the following trials were carried out: impact trials with an automobile, fire trials, and measurement of the degree of noise absorption. This paper is concerned with the documentation and description of the trials, and their evaluation. Initial conclusions are drawn from the results of measurements. The objective was to use a real-life example to more closely investigate safety-relevant questions which often arise in connection with the use of GRE structures, and to try to collect additional information on these. The GRE system investigated is a double-facing system which was specially developed to further improve the safety of retaining structures with respect to traffic acti ons. The paper finishes with a review of the possibilities arising, and a comparison of the different variants.

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