基于材料性能和数理统计的改性沥青适用性
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U414

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长沙理工大学特殊环境道路工程湖南省重点实验室开放基金资助项目(KFJ180503);陕西省教育厅科研计划项目资助(19JK0431)


Study on the applicability of modified asphalt based on material properties and mathematical statistics method
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    摘要:

    为了寻求经济且环保的改性沥青结合料,以克服或减轻河北地区沥青路面的车辙和裂缝等病害,本文选用废胶粉(GTR),多聚磷酸(PPA)和SBS高聚物作为SK90#基质沥青的改性剂,以河北某高等级公路为依托工程,在充分考虑当地施工环境的前提下,基于室内试验对不同改性沥青的高低温性能进行研究。同时,基于数理统计方法和沥青结合料的性能对各改性沥青在不同老化状态和不同温度条件下进行分组,从而研究GTR改性沥青和PPA改性沥青在河北地区的适用性。研究结果表明,与基质沥青相比,SBS,GTR和PPA三种改性剂对未老化和RTFO老化后的改性沥青高温性能均有显著影响。在河北地区,基于经济性对比结果,当强调沥青路面的高温性能时,掺加0.7%PPA(1.2%PPA)的改性沥青可以替代掺加3%SBS(5%SBS)的改性沥青;当强调沥青路面的低温性能时,掺加8%GTR或掺加1.2%PPA的改性沥青可以代替掺加5%SBS的改性沥青使用;SBS,GTR和PPA三种改性剂的掺加对经PAV老化后的改性沥青在中温区间时(22℃~31℃)的抗车辙性能不会造成显著影响;相较于基质沥青,掺加PPA可以增加沥青结合料的m值,而掺加GTR或SBS在一定程度上会降低该值。

    Abstract:

    In order to seek economical and environmentally friendly modified asphalt binders to overcome or mitigate the rutting and cracking of asphalt pavement in Hebei, waste rubber powder (GTR), polyphosphoric acid (PPA) and SBS polymer were selected as modifier adding to the virgin asphalt binder SK90#. The modifier of matrix asphalt is based on a highway in Hebei Province. Based on the consideration of the local construction environment, the high and low temperature performance of different modified asphalt binders were studied based on laboratory testsand mathematical statistics. The properties of the binder were grouped under different aging conditions and different temperature conditions to study the applicability of GTR modified asphalt and PPA modified asphalt in Hebei. The results show that compared with the matrix asphalt, the three modifiers SBS, GTR and PPA have significant effects on the high temperature properties of the the unaged and RTFO aged modified asphalt. In Hebei region. Based on the economic comparison results, when emphasizing the high temperature performance of asphalt pavement, modified asphalt blended with 0.7% PPA (1.2% PPA) and 3% SBS (5% SBS) can be used interchangeably. When emphasizing the low-temperature performance of asphalt pavement, modified asphalt with 8% GTR or 1.2% PPA can be used in Hebei instead of modified asphalt with 5% SBS. The addition of SBS, GTR and PPA modifiers does not have a significant impact on the rutting resistance for the modified asphalt after PAV aging in the middle temperature range (22°C ~ 31°C); compared with the matrix asphalt, the addition of PPA can increase the m value of the asphalt binder , but reduces this value when added GTR or SBS modifiers.

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引用本文

张琛,潘峰,李佳侬. 基于材料性能和数理统计的改性沥青适用性[J]. 科学技术与工程, 2020, 20(34): 14243-14250.
ZHANG Chen, Pan feng, LI Jianong. Study on the applicability of modified asphalt based on material properties and mathematical statistics method[J]. Science Technology and Engineering,2020,20(34):14243-14250.

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  • 收稿日期:2019-12-28
  • 最后修改日期:2020-08-27
  • 录用日期:2020-05-31
  • 在线发布日期: 2020-12-30
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