How Does CE Marking Works?

The good news is that CE marking is integral part of the BS EN Standards for aggregates, and therefore, as you are likely to produce your aggregate to such standards already, obtaining the CE mark may be easier than you think.
The requirements for the CE marking are usually set in Annex ZA of your relevant BS EN Standard (e.g. BS EN 13043 aggregates for asphalt, and BS EN 13242 aggregates for unbound applications etc.). There you will find:

• The list of product characteristics you will need to designate or declare a category or value for, as appropriate (e.g. designation d/D for aggregates size, category for resistance to fragmentation, declared value of chloride content etc.)
• Whether or not a third party certification is required.
• The procedures to attest conformity of your aggregates (e.g. initial type testing, factory production control)
• Supplementary information you need to provide in the declaration of conformity
• Some examples of CE marking you could affix on the label, packaging and/or commercial documents accompanying your product.