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São José dos Campos, Brazil

Norambuena-Contreras J.,University of Bio Bio | Gonzalez-Torre I.,University of Bio Bio | Fernandez-Arnau D.,Huesker Ltda | Lopez-Riveros C.,University of Bio Bio
Construction and Building Materials | Year: 2016

Geosynthetics are composite materials usually employed as anti-reflective cracking systems in asphalt pavements. However, materials that compose geosynthetics can be damaged due to mechanical and thermal effects produced during the installation process under Hot Mix Asphalts (HMAs). Although different studies have been carried out with the aim of evaluating the damage due to installation on geosynthetics, it is still not clear which variables have more influence on the deterioration of these materials and on the reduction of their properties. Therefore, the main objective of this paper was to evaluate the physical and mechanical damage produced on fibres of geosynthetics used as anti-reflective cracking systems in asphalt pavements. With this purpose, a new procedure to simulate in laboratory conditions the damage produced by the spread and compaction of a HMA on geosynthetics has been developed, by using dynamic compaction of aggregates at high temperatures. Thus, this procedure experimentally simulates the thermal and mechanical loads that geosynthetics undergo when they are used as anti-reflective cracking system. Thereby, different synthetic fibres such as polyester, polyvinyl-alcohol and glass fibres have been evaluated under the developed procedure. Finally, the reduction of physical and mechanical properties has been evaluated by using contrast tests, quantifying the damage produced on the fibres of geosynthetics after different deterioration procedures. Main conclusions of this research established that damage procedure using dynamic compaction of aggregates did not significantly reduce mechanical properties of the fibres strings evaluated by tensile tests on the studied geosynthetics. However, these results were different depending on the material that compose the geosynthetics. © 2016 Elsevier Ltd. All rights reserved.

Costa G.C.,Federal University of Minas Gerais | Urashima D.C.,Federal University of Minas Gerais | Marques G.F.,Federal University of Minas Gerais | Vidal D.,Brazilian Technological Institute of Aeronautics | Silva A.E.F.,Huesker Ltda
9th International Conference on Geosynthetics - Geosynthetics: Advanced Solutions for a Challenging World, ICG 2010 | Year: 2010

Water erosion on inclined surfaces can cause significant damage to agricultural fields, mining areas and buildings especially when intense earthmoving and landscaping are involved such as road and rail slopes, divisions into lots and urbanization sites. In those cases the usual time delay between the intervention on the natural landscape and the effective establishment of new vegetation cover leaves the surfaces unprotected and more susceptible to the erosive process. This erosive process may cause modifications on slopes, soil flowing on plateaus and roads, blockages of tubular nets, soil deposits over channels and drainage basins and, even more, problems in foundation elements. In order to vegetate the slopes as quickly as possible there are products, constructive techniques and combinations of both that improve the germination conditions and on vegetation development. Practices such as small planting holes on the surface, biomats, HDPE geocells and hydro seeding represent some of the more common alternatives of protection. The present work describes the improvement of a widely used technological platform, galvanized wired net, with geosynthetics strips designed for soil retention. This new, improved technology has the following functionalities: protection of slopes, aesthetic appeal and respect to sustainability criteria. The design parameter and variables were investigated and tested with a prototype applied on a test site. The performance was evaluated through soil retention capacity, vegetation process and ease of handling. The prototype and its configurations proved to be well adapted for use on surfaces ramps with slopes significantly elevated, indicating that this technology is potentially suitable for vegetation of heavily skewed areas and degraded soils requiring repeated refills of enrichment items until the attainment of minimum conditions for the development of plant cover more effectively.

Monser C.A.,STE SA | Montestruque G.E.,Huesker Ltda | Silva A.E.F.,Huesker Ltda
9th International Conference on Geosynthetics - Geosynthetics: Advanced Solutions for a Challenging World, ICG 2010 | Year: 2010

Crack reflection for the new asphalt overlay have been a frequent problem in pavement maintenance jobs on roads and on airports. For prolonging the service life of a rehabilitated pavements, in January 2002, a new overlay was executed on an originally rigid access stretch known as Taxi Golf of the Salgado Filho International Airport in Porto Alegre, state of Rio Grande do Sul in Brazil A polyester geogrid was used as an anti-reflective crack system and asphalt reinforcement for enlarging the service life of the restored pavement. After almost 8 years of the work done the comparison of the benefits of the reinforced overlay with of a simple overlay is possible, once two tracks were restored, one with geogrid and other without. The track without geogrid presents a severe condition of crack pattern. To evaluate the vertical and horizontal movements between existing crack walls a displacement measurement device called "Crack Activity Meter" was used. The adherence between asphalt layers is very important for the good behavior of the pavement. The stress distribution on the interface of asphalt layers may be deeply influenced by its adherence. A direct shear equipment called "Leutner Shear Test" was used for verifying the adherence between asphalt layers and the geogrid.

Vertematti J.C.,Huesker Ltda | Silva A.,Huesker Ltda
9th International Conference on Geosynthetics - Geosynthetics: Advanced Solutions for a Challenging World, ICG 2010 | Year: 2010

The linear geoforms, also called geotextile tubes, large sausages or geocontainers, have been used mainly on applications related to erosion control and retaining dikes for hydraulic fills, since 1980ś years, as shown at Bogossian at al (1982). Another important field of application is growing in the last 10 years, all over the world: geoforms acting as containers for sludges or slurries dewatering. Especially in Brazil, this kind of tubes use has been growing during the last four years and the results have been very incitant. Uberlândia City is the most important city in Minas Gerais State - Brazil and has a population of about 660,000 people nowadays. DMAE-Water and Sewage Municipal Department is proud of reaching the goal of 100% of treated sewer in the city and the sewerage treatment plant called ETE - Uberabinha is responsible for 95% of this amount, say around 600,000 inhabitants sewage. As the population growth is about 2.5 % a year, the need for new solutions for the crescent sewage treatment amount led to the use linear geoforms as containers for speed up dewatering of 30 m3/h of flocculated sludge outlet. This paper details the use of two linear geoforms in the ETE-Uberabinha - DMAE - MG, 60m long × 19.4m perimeter each one, analyzing the excellent results in terms of elapsed time for dewatering, effluent turbidity, DE - drainage efficiency, FE - filtering efficiency, and other related parameters, as well as the operational easiness for all the new treatment system, mainly the two large sausages performance.

Schnaid F.,Federal University of Rio Grande do Sul | Winter D.,Federal University of Rio Grande do Sul | Silva A.E.F.,Huesker Ltda | Alexiew D.,Huesker Synthetic GmbH | Hebmuller A.,Magna Consultoria
10th International Conference on Geosynthetics, ICG 2014 | Year: 2014

Geosynthetic Encased Sand Columns (GEC) have been frequently adopted in geoengineering practice to improve bearing capacity, reduce settlements and accelerate consolidation in saturated soft cohesive ground. The present paper extends these early views by introducing the use of columns to reduce the magnitude of horizontal earth pressures acting on structures adjacent to compaction fills. The monitoring program of a full-scale bridge abutment on soft soil supported by GECs and geogrid reinforced system is described and field performance was monitored with pressure cells, electrical piezometers, inclinometers and settlement plates. The collected database is interpreted in order to estimate the horizontal earth pressure over bridge border foundation piles.

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