| 摘要: |
| 通过5℃延度试验、25℃针入度试验和小梁弯曲蠕变试验（BBR），研究了不同种类的多聚磷酸（PPA）改性沥青和PPA复合改性沥青（PPA+SBS，TB+PPA+SBS）的低温性能.结果表明：PPA掺量的增加有利于提高埃索70#的低温性能，PPA对伊朗70#的低温性能有害，对沥青胶结料的改性结果与沥青的化学组分有很大的关系；随着PPA掺量的增加，PPA+SBS的低温性能先升高后降低，对PPA+SBS的低温性能不利；对于TB+PPA+SBS，从软化点变化来看，PPA的掺加有利于提高其高温性能，总体上PPA对PPA+SBS，TB+PPA+SBS的低温性能影响较小，二者的低温性能主要由胶粉和SBS掺量决定，胶粉可以明显提升PPA复合改性沥青的低温性能. |
| 关键词: 道路工程 低温性能 复合改性 多聚磷酸 |
| DOI：103969/j.issn.1007 9629201706028 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51478351） |
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| Low Temperature Performance of Polyphosphoric Acid Composite Modified Asphalt |
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ZHOU Yan, HUANG Weidong, FU Xingkai
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Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China
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| Abstract: |
| The low temperature performance of different original asphalts, polyphosphoric acid(PPA) modified asphalt and composite modified asphalts based on PPA(PPA+SBS, TB+PPA+SBS) were investigated by ductility test(5℃), penetration test(25℃) and bending beam rheometer(BBR). The results show that the low temperature performance of the Esso 70# asphalt is improved while the low temperature performance of Iran 70# asphalt declined with the increase of the amount of PPA which indicated that the modification effect of PPA modified asphalt is related to the chemical composition of original asphalt. Based on the PG index, the low temperature performance of PPA+SBS increases first and then decreases and from the 5℃ ductility value, the increase of PPA on the low temperature performance of PPA+SBS is unfavorable. The softening point value indicates that PPA could improve the high temperature performance of TB+PPA+SBS. Overall, the influence of PPA on the low temperature performance of TB+PPA+SBS and PPA+SBS is not obvious and the performance of asphalt binder is mainly determined by TB rubber powder and SBS, TB rubber powder can significantly enhance the low temperature performance of asphalt binders. |
| Key words: road engineering low temperature performance composite modification polyphosphoric acid |
