氧化和硫化聚合物改性沥青流变性能研究

在基质沥青中加入一定量的SBR、XSBR、SBS,观察对沥青材料常规性能以及-30～100℃下动态力学流变性能的影响。结果表明,加入粉末SBR1500后改性沥青材料薄膜前后的延度和流变性能都有明显的改进,而硫化共混改性可显著提高低温下改性沥青的粘弹性能,低温性能明显改善;同时高温性能得到提高,改性沥青的车辙温度（G＊/sinδ=1kPa）比基质沥青提高约10℃;粘度增大,复合模量提高,在高温区的相位角和损耗因子变小,从而改善了沥青高温粘弹性能。硫化共混改性沥青对使用环境的温度敏感性变小,使改性沥青的高低稳定性能均得到改善,可在高温环境下使用,拓宽了SBR改性沥青的使用范围。

Rheological Characterization of SBR Modified Asphalts Under Oxidation and Sulfurization

Polymer modified asphalts were prepared with SBR,XSBR,SBS under oxidation or sulfurization conditions using a special mixing technique. The low temperature properties of the binders were greatly improved,the dynamic mechanical properties of SBR-modified asphalts before and after oxidation or sulfurization were characterized at -30~100 ℃ by using dynamic shear rheometry. The results show that the addition of SBR1500 increased the binder elasticity at low temperature. And sulfurization modification is improved the complex modolus G＊ and elasticity property at high temperature,when G＊/sinδ=1 kPa,the temperature of PMA is 10 ℃ higher than the base asphalts after sulfurization,also the δ became smaller than the base asphalts,their temperature susceptibility is reduced to a great extent.It indicates that the viscoelasticity of the modified binder had been improved effectively at the high temperature. And the temperature susceptibility of the vulcanized-SBR asphalts were reduced to a great extent,their properties were improved apparently from low to high temperature,their application would be developed widely in the high temperature environment conditions.