According to WPB, the German Road and Transportation Research Association (FGSV) has published a new 2025 edition of its Technical Delivery Conditions for Road Bitumen and Ready-to-Use Polymer-Modified Bitumen. A key highlight of this update is the introduction of very soft types of road bitumen into the official specifications for the first time.
The revised document, known as TL Bitumen-StB 25, sets the criteria for the supply and use of bitumen in hot-mix asphalt for constructing roads, footpaths, and other paved traffic surfaces. It replaces the earlier standards released in 2007 and revised in 2013.
This edition incorporates Germany’s national requirements based on two important European norms:
• DIN EN 12591: Standards for paving-grade bitumen, which is the type of bitumen used in standard road construction.
• DIN EN 14023: A framework for defining the properties of polymer-modified bitumen (PmB)—a type of bitumen enhanced with polymers to improve flexibility and resistance to deformation.
The update also includes key amendments from the General Circular for Road Construction (ARS 8/2019) issued by the Federal Ministry of Transport. In addition, it reflects outcomes from the research project FE 29.0459/2020, which evaluated how bituminous binders (bitumen mixed with additives) change under artificial aging in the lab. As a result, new requirements have been added regarding the rheological properties of the material—that is, how it flows and behaves under stress or temperature changes. These are especially important for ensuring long-lasting and safe road surfaces.
The document, titled TL Bitumen-StB 25 and listed under reference number 794, has been published by the FGSV and is available to researchers, engineers, and relevant institutions. Further information about accessing the document can be obtained through FGSV’s official channels.
By WPB
Bitumen, Road, Asphalt
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