With respect to the overall cold asphalt pavement material, ≧1.0 wt. % of gypsum hemi-hydrate is added to a cold asphalt pavement material to improve the stability and workability of cold asphalt pavement materials.

With respect to the overall cold asphalt pavement material, ≧1.0 wt. % of gypsum hemi-hydrate is added to a cold asphalt pavement material to improve the stability and workability of cold asphalt pavement materials.

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.

Bitumen granules including at least: bitumen, a compound of general formula R1-(COOH)z (I), a compound of general formula R2-(NH)nCONH—X—(NHCO)p(NH)n-R3 (II), and a compound of general formula Ar1-R-Ar2 (III); and a method for producing the bitumen granules and to the use thereof as asphalt binder.

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.

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.

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.

Bitumen which is solid at ambient temperature, in the form of granules including a core made of a first bituminous material and a coating layer made of a second bituminous material, in which: the first bituminous material includes at least one bitumen base and the second bituminous material includes: at least one bitumen base and at least one chemical additive chosen from: an organic compound, a viscosifying compound, a paraffin, a polyphosphoric acid and mixtures thereof; or at least one pitch having a ring-and-ball softening point (RBSP) greater than or equal to 80° C., it being understood that the RBSP is measured according to the EN 1427 standard; or a mixture of these materials.

Bitumen which is solid at ambient temperature, in the form of granules including a core made of a first bituminous material and a coating layer made of a second bituminous material, in which: the first bituminous material includes at least one bitumen base and the second bituminous material includes: at least one bitumen base and at least one chemical additive chosen from: an organic compound, a viscosifying compound, a paraffin, a polyphosphoric acid and mixtures thereof; or at least one pitch having a ring-and-ball softening point (RBSP) greater than or equal to 80° C., it being understood that the RBSP is measured according to the EN 1427 standard; or a mixture of these materials.

A nonvolatile cold modified asphalt binder and a nonvolatile cold recycled asphalt mixture using the same are manufactured by optimally mixing a petroleum asphalt, a native asphalt, a polymer modifier, process oil, and an adhesive strength enhancer. The nonvolatile cold modified asphalt binder includes at least one petroleum asphalt selected from a straight asphalt or a blown asphalt; at least one native asphalt selected from gilsonite, glance pitch, and grahamite; a rubber-modified-compound (RMC) polymer modifier which is a vinyl aromatic hydrocarbon-conjugated diene block copolymer including at least one of a styrene-butadiene block copolymer (SBS), a styrene-isoprene block copolymer (SIS), and a styrene-ethylene-butylene block copolymer (SEBS); at least one process oil selected from paraffin oil, naphthenic oil, aromatic oil, natural oil, and mineral oil; and at least one adhesive strength enhancer selected from rosin esters, modified acryls, modified silicones, polyvinyl esters, and silicone resins.