Uma breve visão sobre geossintéticos aplicados a aterros sanitários

Liners are impermeable barriers used in landfills to avoid or decrease the flux of leachate to protect, by the way, the environmental. Many ways of barriers are used: soil with low hydraulic conductivity, compacted soils, synthetic materials like geomembranes, geotextiles, geosynthetics clay liners and/or a combination from all those. This paper presents some considerations about landfills and the use of geosynthetics in the composition of the liners which are used in both cover and basal systems to maintenance of the flux.Os liners são barreiras impermeáveis utilizadas em aterros sanitários para impedir ou diminuir o fluxo de resíduos líquidos gerados protegendo, dessa forma, o meio ambiente. Diversas formas de barreiras impermeáveis são utilizadas: solos com baixa condutividade hidráulica, solos compactados, materiais sintéticos como geomembranas, geotêxteis, geocompostos argilosos e/ou uma combinação de todos estes. Esse artigo apresenta algumas considerações sobre os aterros sanitários e sobre o uso geossintéticos na composição dos liners em sistemas de cobertura e em sistemas basais para a manutenção da estanqueidade do fluxo percolado

Uma breve visão sobre geossintéticos aplicados a aterros sanitários

Liners are impermeable barriers used in landfills to avoid or decrease the flux of leachate to protect, by the way, the environmental. Many ways of barriers are used: soil with low hydraulic conductivity, compacted soils, synthetic materials like geomembranes, geotextiles, geosynthetics clay liners and/or a combination from all those. This paper presents some considerations about landfills and the use of geosynthetics in the composition of the liners which are used in both cover and basal systems to maintenance of the flux.Os liners são barreiras impermeáveis utilizadas em aterros sanitários para impedir ou diminuir o fluxo de resíduos líquidos gerados protegendo, dessa forma, o meio ambiente. Diversas formas de barreiras impermeáveis são utilizadas: solos com baixa condutividade hidráulica, solos compactados, materiais sintéticos como geomembranas, geotêxteis, geocompostos argilosos e/ou uma combinação de todos estes. Esse artigo apresenta algumas considerações sobre os aterros sanitários e sobre o uso geossintéticos na composição dos liners em sistemas de cobertura e em sistemas basais para a manutenção da estanqueidade do fluxo percolado

The Effects of Weathering Exposure on the Physical, Mechanical, and Thermal Properties of High-density Polyethylene and Poly (Vinyl Chloride)

This paper presents results describing the physical, mechanical, and thermal properties (melt flow index - MFI and oxidative induction time - OIT) of high density polyethylene and poly (vinyl chloride) after weathering exposure (6, 12, 18, and 30 months). The materials exposed were geomembranes of two thicknesses: 1.0 and 2.0 mm (PVC) and 0.8 and 2.5 mm (HDPE). The climate parameters (average) obtained were 25 degrees C (temperature), 93 mm (precipitation), 66% (relative humidity), and 19 MJ/m(2). day (intensity of global radiation). Some results showed, for instance, that the behavior of the geomembranes changed after the exposures. A few minor variations in physical properties occurred. The density and thickness, for instance, varied 0.5-1.0% (average) for both the PVC and HDPE geomembranes. The mechanical properties changed as a function of the period of exposure. In general, some decreases were verified by the deformation of PVC. The samples became more rigid. In contrast, HDPE geomembranes became more ductile. Despite the variations in elasticity, some increases in deformability were verified. An MFI test showed some degradation in HDPE geomembranes. OIT tests revealed small values for both intact and exposed samples

Reinforcing Effect of Polypropylene Waste Strips on Compacted Lateritic Soils

This study evaluated the strength properties of compacted lateritic soils reinforced with polypropylene (PP) waste strips cut from recycled plastic packing with the goal of promoting sustainability through using local materials for engineering work and reusing waste materials as low-cost reinforcements. Waste PP strips with widths of 15 mm and different lengths were uniformly mixed with clayey sand (SC) and clay (CL) soils with the goal of using these materials as low-cost fiber reinforcements. The impact of different PP strip contents (0.25% to 2.0%) and lengths (10, 15, 20, and 30 mm) on the unconfined compressive strength (UCS) of the soils revealed an optimum combination of PP strip content and length. Statistical analysis showed that PP strip content has a greater effect than the PP strip length on the UCS for both soils. Results led to the definition of an empirical equation to estimate the UCS of strip-reinforced soils. The results from direct shear tests indicate that the SC soil showed an increase in both apparent cohesion and friction angle after reinforcement, while the CL soil only showed an increase in friction angle after reinforcement. California bearing ratio (CBR) tests indicate that the SC soil experienced a 70% increase in CBR after reinforcement, while the CBR of the CL soil was not affected by strip inclusion

Reinforcing Effect of Polypropylene Waste Strips on Compacted Lateritic Soils

This study evaluated the strength properties of compacted lateritic soils reinforced with polypropylene (PP) waste strips cut from recycled plastic packing with the goal of promoting sustainability through using local materials for engineering work and reusing waste materials as low-cost reinforcements. Waste PP strips with widths of 15 mm and different lengths were uniformly mixed with clayey sand (SC) and clay (CL) soils with the goal of using these materials as low-cost fiber reinforcements. The impact of different PP strip contents (0.25% to 2.0%) and lengths (10, 15, 20, and 30 mm) on the unconfined compressive strength (UCS) of the soils revealed an optimum combination of PP strip content and length. Statistical analysis showed that PP strip content has a greater effect than the PP strip length on the UCS for both soils. Results led to the definition of an empirical equation to estimate the UCS of strip-reinforced soils. The results from direct shear tests indicate that the SC soil showed an increase in both apparent cohesion and friction angle after reinforcement, while the CL soil only showed an increase in friction angle after reinforcement. California bearing ratio (CBR) tests indicate that the SC soil experienced a 70% increase in CBR after reinforcement, while the CBR of the CL soil was not affected by strip inclusion