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Bio-asphalt uses lignin as a binder

Lignin is a renewable, wood-based, non-toxic performance enhancer that can be used to amend and even replace fossil-based materials in various applications and to reduce the carbon footprint of the end product. One of those applications is asphalt. Source: Timberbiz

Lineo by Stora Enso can be used to replace oil-based phenolic materials in a range of applications, such as in resins for plywood, oriented strand board (OSB), laminated veneer lumber (LVL), paper lamination, and insulation material.

Recently, it has proven its worth in replacing a fossil-based binder, bitumen, in asphalt. Stora Enso customer H4A (Holding de Vier Ambachten) has successfully been using Lineo in Central Europe in several asphalt projects from bike lanes to heavy load transportation roads.

In these cases, half of the amount of bitumen has been replaced by Lineo. One of the examples of using H4A’s Bioway includes Stora Enso’s Langerbrugge Mill in Belgium where the bio-asphalt is continuously exposed to heavy industrial transportation.

“On top of being a renewable material, lignin-asphalt is as good as regular asphalt, if not even better, regarding technical specifications,” Innovation and Quality Manager Martijn Verschuren at H4A said.

Regular asphalt is produced by heating bitumen and stones and mixing them in the temperature of 170 celsius degrees.

“Producing bio-asphalt with lignin requires less energy than a regular one as the asphalt-mixing temperature can be significantly reduced. This is another factor reducing the carbon footprint of the asphalt,” Mr Verschuren said.