Experimental evaluation of a newly developed nanocoating for EPS

Expanded Polystyrene (EPS) is widely used in geotechnical applications, where its durability depends on geomembrane protection. The aim of this study was to develop a new eco-friendly nanocoating for EPS, that can resist hydrocarbons, made of polyurethane and nanocellulose extracted from sugarcane waste. The nanocoating is proposed as an alternative in certain cases when it is impractical or uneconomic to use geomembrane. Experimental testing showed full resistance of the nanocoated EPS against diesel, in addition to a water absorption percentage below 2.7% by weight. The static and dynamic properties were also measured, as well as the interface properties of the nanocoated EPS samples with sand and concrete. Results showed that the compressive and flexural strength of the nanocoated samples significantly improved by 38% and 110%, respectively, compared with uncoated samples. The interface and dynamic properties showed great enhancement. Additionally, an economic feasibility study was performed to compare the use of nanocoating and geomembrane across the manufacturing, transportation, and construction stages to evaluate their economy, whereas results indicated that nanocoating is about 7.1% lower in cost. In general, the outcomes indicate that the newly developed nanocoating is a promising option that can be used to protect EPS and enhance its performance.