| 摘要 |
A modified asphalt binder composition is disclosed, which comprises: (a) about 40% by weight to about 98.9% by weight asphalt binder material; (b) about 0.5% by weight to about 25% by weight crumb rubber; (c) about 0.5% by weight to about 30% by weight of at least one synthetic polymer; and (d) about 0.05% by weight to about 5% by weight of at least one acid selected from the group consisting of phosphoric acid, polyphosphoric acid, sulfuric acid at more than 90% wt, boric acid, adipic acid, citric acid, oxalic acid, tartaric acid, maleic acid, valeric acid, succinic acid, fumaric acid, glutamic acid, phthalic acid, acetic acid, and combinations thereof. A method for making a modified asphalt binder composition is also disclosed, which comprises the steps of: a. providing neat asphalt in an appropriate vessel; b. heating the neat asphalt to a temperature of between about 120 Deg. C and about 200 Deg. C; c. adding to the neat asphalt a first modifying ingredient selected from the group consisting of at least one acid, at least one synthetic polymer and crumb rubber; d. mixing the asphalt and the first modifying ingredient with one of a high shear mixer or a low shear mixer for a period of between about 5 minutes and about 10 hours e. adding to the modified asphalt binder a second modifying ingredient selected from the group consisting of at least one acid, at least one synthetic polymer and crumb rubber, wherein the second modifying ingredient is a different type of ingredient than the first modifying ingredient; f. mixing the second modifying ingredient and the modified asphalt binder in one of a high shear mixer or a low shear mixer for a period of between about 5 minutes and about 10 hours; g. adding to the modified asphalt binder a third modifying ingredient selected from the group consisting of at least one acid, at least one synthetic polymer and crumb rubber, wherein the third modifying ingredient is a different type of ingredient than the first modifying ingredient and the second modifying ingredient; and h. agitating the third modifying ingredient and the modified binder material in one of a low shear mixer or a high shear mixer for a period of between about 5 minutes and about 48 hours. |
