| Road traffic is communal base establishment, wriich is service for national economy development of society and people's living. It is one of important symbol for weigh economy strength and modernization level in each country.The asphalt road materials development have been droved by the development of highway construction, so the quantity and the quality of asphalt materials increase progressively, especially, the demand for performance of weighty traffic asphalt is further high, our country must energetically study and empolder modified asphalt materials for highway construction because of performance of homemade asphalt.Two parts are included in this study:Part one: Study evolve in domestic and overseasThe general introduction were given about the class, property and composing of asphalt and the development background, study evolve in domestic and overseas and class of modified asphalt. The comparative detailed introductions were given about performance and influencing factors, appraisable means of some important polymer modified asphalt.Part two: experiment and mechanism discussion1 Experiment apparatus, experiment means and test means were listed in this study.2 The base asphalt was modified with the SBR and waste rubber powder. Softening point, penetration, ductility in 5℃ of before and after Round Thin Film Oven Test (RTFOT) were mensurated.3 The waste rubber powder was swelled with plasticizers, then it was eradiated with microwave. The road asphalt was modified with the powder SBR and waste rubber powder which was preliminary treated with microwave firstly. The results show: Softening point increased. It showed that the high temperatures stabilization is good. Ductility in 5C increase distinctly. It showed the anti-crack at low temperatures is good. Ratio of penetration loss was little after RTFOT and ductility in 5C scarcely any change before and after RTFOT. It showed the performance of anti-aging is good. The modified asphalt may be looked upon materials for highway road. The sea and island structure which the island lied in the sea and the sea lied in the island of the modified asphalt was characterized by SEM. The modified asphalt was characterized by element analysis, TEM, AFM, GPC, TG and FT-IR. We discussedthe possible mechanism of the modification. The cost of the modified asphalt decrease if the road asphalt will be modified with microwave irradiation waste rubber powder.4 The road asphalt was modified with powder SBR and betonite which reserves abundantly and cheap and organic betonite which was industrialization production firstly. The result show: Softening point distinctly increased and penetration decreased. It showed the high temperatures stabilization is improved. Ductility in 5C increase distinctly. It showed the anti-crack at low temperatures is good. Ratio of penetration loss was little after RTFOT. It showed the performance of anti-aging is good. The modified asphalt may be looked upon materials for highway road. The undee samdwich of the modified asphalt was characterized by SEM. The performance of high and low temperature was improved simultaneity because the materials of modified asphalt had structure of the undee samdwich. The modified asphalt was characterized by element analysis, TEM, XRD, TG and FT-IR. We discussed the possible mechanism of the modification. The cost of the modified asphalt decrease if the road asphalt will be modified with betonite and organic betonite.The science and the Technology Commission of Gansu Province and the NWNU-KJCXGC-03 of Northwest Normal University, supported this work. We referred to lots of literatures, it was not reported that the base asphalt with the waste rubber powder which were treated with microwave, betonite, organic betonite and powder SBR blend was modified respectively .
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