| 摘要 |
A modified asphalt binder composition is disclosed, which comprises: a. about 60% by weight to about 98.9% by weight asphalt binder material; b. about o. 1% by weight to about 30% by weight crumb rubber; c. 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, phtalic acid, acetic acid, and combinations thereof; and d. about 0.01% by weight to about 5% by weight of a cross-linking agent. 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 between about 0.5% by weight and about 30% by weight crumb rubber; d. mixing the asphalt and the crumb rubber 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 between about 0.01% by weight and about 5% by weight of a cross-linking agent; f. mixing the cross-linking agent and asphalt with 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 between about 0.05% by weight and about 5% by of at least one acid; and h. agitating the acid and asphalt with one of a high shear mixer or a low shear mixer for a period of between about 5 minutes and about 48 hours.
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