Cold-in-place asphalt recycling is disclosed. A foamed asphalt may be produced by injecting water and optionally compressed air into a hot asphalt stream. A lubricating surfactant may be added to the hot asphalt stream to improve performance. The foamed asphalt may be mixed with reclaimed material to provide a uniformly coated paving material that can compacted to a desired density.

A method is shown for preparing cold-process bituminous coatings, in particular the preparation of wear surface dressings which method includes the steps of preparing a bituminous binder as a cationic emulsion of bitumen; preparing an aggregate comprising at least one first aggregate fraction; and forming said cold-process bituminous coating formed with at least said aggregate interpenetrated into said binder; characterized in that said step for preparing said aggregate comprises a step for coating said at least one first aggregate fraction with lime.

A method is shown for preparing cold-process bituminous coatings, in particular the preparation of wear surface dressings which method includes the steps of preparing a bituminous binder as a cationic emulsion of bitumen; preparing an aggregate comprising at least one first aggregate fraction; and forming said cold-process bituminous coating formed with at least said aggregate interpenetrated into said binder; characterized in that said step for preparing said aggregate comprises a step for coating said at least one first aggregate fraction with lime.

Pavement aging can be reduced by applying to an asphalt-containing pavement a topcoat layer or a surface treatment containing asphalt binder emulsion with sterols.