Asphalt additive

Disclosed is an asphalt additive which increases the adhesion between asphalt and aggregates. The use of the asphalt additive ensures the anti-stripping effect of the asphalt from the aggregates not only immediately after the paving work but also after the lapse of a long time. That is, the present invention provides an asphalt composition comprising an asphalt and additive comprising at least one of the compound having the formula (I), (II) or (III): ÄR O - (PO)m(EO)nÜx - P(=O) - (OH)y wherein R represents a linear hydrocarbon radical having 8 to 24 carbon atoms or an alkyl phenyl group having 8 to 24 carbon atoms, PO represents oxypropylene group, EO represents oxyethylene group, each of m and n represents the number of added molecules, m is a number of 1 to 6, n is a number of 0 to 6; ÄR O - (PO)m(EO)nÜx - P(=O) - (OH)y wherein R represents an aliphatic hydrocarbon radical having a branched methyl group and having 8 to 24 carbon atoms, PO represents oxypropylene group, EO represents oxyethylene group, each of m and n represents the number of added molecules, m is a number of 0 to 6, n is a number of 0 to 6; and ÄR O - (PO)m(EO)nÜx - P(=O) - (OH)y wherein R represents an aliphatic hydrocarbon radical having two or more branched methyl groups or at least one of branched group including 2 or more carbons and having 8 to 24 carbon atoms, PO represents oxypropylene group, EO represents oxyethylene group, each of m and n represents the number of added molecules, m is a number of 0 to 6, n is a number of 0 to 6, each of x and y of the formula (I), (II) or (III) being a number of 1 to 2, the sum total of x and y being 3, R ,R and R being saturated or unsaturated.