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

The invention concerns the use of an aqueous suspension of solid particles of a calcium/magnesium compound of formula (A): nCa(OH).sub.2.mCaCO.sub.3.aMgO.bMg(OH).sub.2.cMgCO.sub.3.I as an agent regulating the breaking of a bitumen emulsion. The invention also concerns a bituminous road material obtained by mixing a solid mineral fraction with a cationic bitumen emulsion of the type binder in water, characterised in that it involves adding, to the mineral fraction, an aqueous suspension of solid particles of a calcium/magnesium compound of formula (A). The invention also concerns a method for preparing a material according to the invention and the use of same for producing surface courses, tack coats or temporary surface courses. The invention finally concerns a method for obtaining a tack coat by spreading a cationic bitumen emulsion, comprising a step of applying an aqueous suspension of solid particles of a calcium/magnesium compound of formula (A).

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.

Disclosed herein are rejuvenating compositions for asphalt applications. In one aspect, the rejuvenating composition comprises a polymerized oil having a polymeric distribution ranging from about 2 to about 80 wt % oligomer content and Hildebrand solubility ranging from about 6 to about 12. In another aspect, the rejuvenating composition comprises an oil having a Hildebrand solubility ranging from about 6 to about 12 and a flash point ranging from about 100 C. to about 400 C. In yet another aspect, the rejuvenating composition comprises a modified oil having a Hildebrand solubility ranging from about 6 to about 12 and a flash point ranging from about 100 C. to about 400 C.

In one embodiment, a cold mix asphalt composition comprises an aggregate blend including an aggregate and a filler; and a cold mix asphalt binder including a urethane-modified asphalt binder mixed with the aggregate blend to form the cold mix asphalt composition.

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.

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

An asphalt composition contains asphalt and a chloroprene-based polymer, wherein a content of the chloroprene-based polymer is 5 parts by mass or more and 20 parts by mass or less based on 100 parts by mass of asphalt solid content, and a tetrahydrofuran insoluble content of the chloroprene-based polymer is 20% by mass or more and 90% by mass or less. A method for producing an asphalt composition includes mixing an asphalt emulsion and a chloroprene latex so that the chloroprene latex is 5 parts by mass to 20 parts by mass based on 100 parts by mass of asphalt solid content in the asphalt emulsion in terms of solid content, wherein a tetrahydrofuran insoluble content of the chloroprene-based polymer is 20% by mass or more and 90% by mass or less.

Asphalt emulsions and methods of forming an asphalt emulsion are provided. In one example, the asphalt emulsion includes a base asphalt component present in an amount of from about 40 to about 60 wt. % of the asphalt emulsion. Water is present in an amount of from about 40 to about 60 wt. % of the asphalt emulsion. An oxidized high-density polyethylene wax is present in an amount of from about 0.5 to about 5.0 wt. % of the asphalt emulsion. A slow-setting cationic emulsifier is present in an amount of from about 1.0 to about 2.0 wt. % of the asphalt emulsion.

A polymer-modified emulsion used for rejuvenating or repairing deteriorated asphalt pavement includes an asphalt phase containing an asphalt and a biobased rejuvenating agent, and an aqueous phase including water and an emulsifying agent, and one or more polymers included in the asphalt phase, the aqueous phase or both.