| 摘要: |
| 为研究SBS掺量、稳定剂含量和老化对高黏SBS改性沥青流变性能与化学特性的影响，针对SBS掺量和稳定剂含量不同的高黏SBS改性沥青，分别采用动态剪切流变仪（DSR）和凝胶渗透色谱（GPC）试验对老化（短期老化和长期老化）前后的改性沥青进行流变性能与化学特性分析.结果表明：相位角主曲线可以很好地表征高黏SBS改性沥青在老化过程中的流变性能；高黏SBS改性沥青中由于广泛的交联作用，使得SBS中形成了大量共价键，因此即便是长期老化，仍有足够数目的共价键来维持SBS结构的完整性；相比无稳定剂的SBS改性沥青，稳定剂的添加大幅度改善了高黏SBS改性沥青的性能，但在已有稳定剂的基础上再增加稳定剂的含量对其性能的提升有限；SBS掺量高的改性沥青需要更长的搅拌时间，以保证SBS在沥青中发生充分溶胀；稳定剂含量高的改性沥青也需要更长的搅拌时间，使SBS分子之间发生交联作用. |
| 关键词: 高黏SBS改性沥青 老化 流变性能 化学特性 重均相对分子质量 |
| DOI：10.3969/j.issn.1007-9629.2021.05.017 |
| 分类号:U414 |
| 基金项目:国家自然科学基金资助项目（51778481，51978518，51908426） |
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| Rheological Properties and Chemical Properties of High Viscosity SBS Modified Asphalt |
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HUANG Weidong1, GAO Jie1, HAO Gengren2, LIU Liyuan1,3, Lü Quan1
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1.Key Laboratory of Road and Traffic Engineering of Ministry of Education，Tongji University，Shanghai 201804， China;2.School of Construction and Environment， Hong Kong Polytechnic University， Hong Kong 999077， China;3.Key Laboratory of Highway Construction and Maintenance Technology of Ministry of Transport in Loess Region， Shanxi Transportation Research Institute Group Co.， Ltd.， Taiyuan 030006， China
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| Abstract: |
| In order to study the influence of SBS content， stabilizer content and aging on the rheological properties and chemical properties of high viscosity SBS modified asphalt， dynamic shear flow was adopted for high viscosity SBS modified asphalt with different SBS content and stabilizer content. The rheological properties and chemical characteristics of modified asphalt before and after aging （short-term aging and long-term aging） were tested by the dynamic shear rheometer （DSR） and gel permeation chromatography （GPC） tests. The results show that the phase angle master curve can well characterize the changes in rheological properties of high viscosity SBS modified asphalt during aging； in high viscosity SBS modified asphalt due to extensive cross-linking， a large number of covalent bonds are formed in SBS Therefore， even after long-term aging， there are still enough covalent bonds to maintain the integrity of the SBS structure； compared with the SBS modified asphalt without stabilizers， the addition of stabilizers greatly improves the performance of the high viscosity SBS modified asphalt. But increasing the content of stabilizer if stabilizer is already contained the performance，then has only limited improvement high content of SBS modified asphalt requires a longer mixing time to make SBS fully swell and stabilize in the asphalt. The higher the content of the agent， the longer blending time is needed to make the cross-linking between the SBS molecules occur. |
| Key words: high viscosity SBS modified asphalt aging rheological property chemical property weight average relative molecular mass |
