Study on the Property of Nano CaCO3/SBS Composite Modified Asphalt and Mixture
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摘要: 为改善SBS（苯乙烯-丁二烯-苯乙烯嵌段共聚物）与基质沥青的相容性，充分发挥出SBS应有的改性效果，进一步提高SBS改性沥青的高温性能和抗老化性能，选择纳米CaCO3对SBS改性沥青进行复合改性。通过三大指标试验、多重应力蠕变恢复试验（Mutiple Stress Creep Recovery Test, MSCR）、弯曲蠕变劲度试验（Bending Beam Rheometer Test, BBR）和温度扫描试验（Temperature Scanning Test, TS）分析不同掺量的纳米CaCO3对SBS改性沥青物理性能、高温流变性能、低温流变性能和抗老化性能的影响，综合考虑各掺量纳米CaCO3对SBS改性沥青性能的影响效果，推荐纳米CaCO3的合理掺量；通过离析试验对比分析SBS改性沥青与纳米复合改性沥青的相容性；通过车辙试验、小梁弯曲试验、浸水马歇尔试验及冻融劈裂试验，研究纳米复合改性沥青混合料的高温稳定性、低温抗裂性和水稳定性。研究结果表明，纳米CaCO3能够改善SBS改性沥青的高温性能和抗老化性能，综合考虑性能影响效果，建议复合改性沥青中纳米CaCO3的合理掺量为4%;纳米CaCO3可以有效改善SBS与沥青的相容性；与SBS改性沥青混合料相比，纳米复合改性沥青混合料具有更加优异的高温稳定性，水稳定性略有提升。此研究结果表明，纳米CaCO3/SBS复合改性沥青及混合料综合性能较好，更适合应用于我国南方炎热地区。Abstract: In order to improve the compatibility of SBS（styrene-butadiene-styrene block copolymer） polymer and base asphalt, give full play to the modified effect of SBS and further improve the high-temperature and anti-aging properties of SBS modified asphalt, nano CaCO3 was chosen to modify SBS modified asphalt. The effects of different amount of nano CaCO3 on physical properties, high temperature rheological properties, low temperature rheological properties and anti-aging properties of SBS modified asphalt were analyzed through three indexes tests, multiple stress creep recovery test（MSCR）, bending beam rheometer test（BBR） and temperature scanning test（TS）. Considering the effect of nano CaCO3 on the performance of SBS modified asphalt, the reasonable content of nano CaCO3 was recommended. The compatibility of SBS modified asphalt and nano composite modified asphalt was compared and analyzed by segregation test. Through rutting test, trabecular bending test, immersion Marshall test and freeze-thaw splitting test, the high-temperature stability, low-temperature crack resistance and water stability of nano composite modified asphalt mixture were studied. The results showed that, nano CaCO3 can improve the high-temperature and anti-aging properties of SBS modified asphalt. Considering the effect of performance impact comprehensively, it was suggested that the reasonable content of nano CaCO3 in composite modified asphalt was 4%. Nano CaCO3 can effectively improve the compatibility between SBS and asphalt. Compared with SBS modified asphalt mixture, nano composite modified asphalt mixture had better high-temperature stability and slightly improved water stability. The results showed that the comprehensive performance of nano CaCO3/SBS composite modified asphalt and mixture was good, which was more suitable for application in hot areas in the South of China.
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Keywords:
- Nano CaCO3 /
- SBS /
- composite modified asphalt /
- rheological properties /
- asphalt mixture /
- road performance
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