This European Standard specifies requirements of Asphalt for Ultra-Thin-Layers (AUTL) for use on roads, airfields and other trafficked areas.
AUTL is a hot mix asphalt road surface course laid on a bonding layer, at a nominal thickness between 10 mm and 20 mm with properties suitable for the intended use. The method of bonding is an essential part of the process and the final product is a combination of the bonding system and the bituminous mixture. The method of bonding of AUTL is out of the scope of this European Standard. Mixtures utilizing bitumen emulsion and bituminous materials based on in situ recycling are not covered by this standard.
This European Standard includes requirements for the selection of the constituent materials. It is designed to be read in conjunction with EN 13108-20 and EN 13108-21.

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This document specifies requirements for the bituminous mixtures for Ultra thin layers Asphalt Concrete (UTLAC) for use on roads, airfields and other trafficked areas.
The grading curve of the bituminous mixture for UTLAC is generally gap graded and the upper sieve size of the mix is not less than 5 mm and not greater than 11 mm.
This document includes requirements for the selection of the constituent materials. It is designed to be read in conjunction with EN 13108-20 and EN 13108-21.
NOTE   Asphalt Concrete very thin layer mixtures with chemical modified binders not covered by EN 13924 are not covered by this document.
The method of bonding is out of the scope of this document.

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