Abstract
In this project, an innovative low hydraulic conductivity material for landfill cover and liner construction was studied. The material is a blend of natural clayey soil from Comodoro Rivadavia city (Chubut province, Argentina) mixed with fine uniform sand and anionic polyacrylamide (APAM). The research emphasizes understanding the influence of APAM addition on the soil water retention capacity (SWRC), unsaturated hydraulic conductivity, and swelling behavior. APAM is a super absorbent polymer that swells when immersed in water. SWRC was evaluated through the filter paper method. The unsaturated hydraulic conductivity and swelling behavior were determined using two fluids: distilled water and brine (C = 2 M). Results showed that APAM addition reduced the blends' microporosity, increased the water retention capacity, and reduced the hydraulic conductivity of the system. These promising results encourage further research on these blends' behavior to determine the most efficient blend formulation to enhance its hydro-mechanical performance and its chemical compatibility with landfill leachates for cover and low hydraulic conductivity liner layer construction.
Highlights
Engineered landfills are facilities of uttermost importance for integrated solid waste management systems all over the world
The specimens permeated with distilled water showed an increment of height with the increment in anionic polyacrylamide (APAM) content
We explored the behavior of sand – clay – APAM blends for their application in cover and liner layers' construction for landfills
Summary
Engineered landfills are facilities of uttermost importance for integrated solid waste management systems all over the world The performance of these facilities relies on the efficiency of their low hydraulic conductivity liner and cover systems. These systems are composed of a combination of layers with different specific functions. One of the most critical layers is the low hydraulic conductivity barrier These barriers use to be constructed either by compacted fine soils, compacted blends of soils and expansive clays, industrial by-products such as fly ash, polymers, or by geosynthetics products such as geomembranes and geosynthetic clay liners. This research aims to analyze the behavior of sand-clay-polymer blends for low hydraulic conductivity cover or liner layer construction for municipal solid waste landfills
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