相变沥青混合料可行性及性能研究
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U416

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国家自然科学基金区域创新发展联合基金(U20A20315)


Study on Feasibility and Performance of Phase Change Asphalt Mixture
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    摘要:

    提升道路除冰雪能力是保障冬季行车安全的重要手段,相变沥青路面作为一种环境友好型技术具有良好的应用前景。为了确定相变沥青混合料融冰雪是否具有实际应用价值,通过显微镜观测固固相变材料相变过程,测定相关热力学参数。对相变沥青混合料路用性能进行检测,开发了3种融冰雪性能评价方法。结果表明,固固相变材料会发生为结晶态和非晶态的相互转变,熔融焓值在吸放热过程中差距不大,均超过70J/g,且50次衰减率在2.8%,可以满足沥青路面长期使用需求;随着相变材料掺加量的增加,沥青混合料高温稳定性降低,低温抗裂性提升,抗水损性能先上升后下降,但均能满足规范要求,相变材料掺加量超过0.3%才具有明显的融冰雪效果。可见,固固相变材料可以作为外掺剂加入到沥青混合料中,基于路用性能角度相变材料掺量在0.3%~0.5%比较合适,相变沥青混合料不适应于全天低于0℃的地区,需要结合其他除冰雪措施才能保障道路通行能力。

    Abstract:

    Improvement of snow and ice melting capacity is an important means to ensure driving safety in winter..Phase change asphalt pavement has a wide prospect as an environment-friendly technology. In order to determine whether melting ice and snow of phase change asphalt mixture has practical application value, this paper observed the phase change process of solid solid phase change materials through a microscope, and measured the relevant thermodynamic parameters. The pavement performance of phase change asphalt mixture was tested, and three evaluation methods for melting snow and ice were developed.The results show that the solid-solid phase change materials underwent the mutual transformation of crystalline and amorphous states. The difference between the melting enthalpy values in the heat absorption and heat release process was small, both exceeding 70J/g, and the 50 times decay rate was 2.8%, which can meet the long-term use needs of asphalt pavement; With the increase of the amount of phase change material, the high temperature stability of asphalt mixture decreased, the low temperature crack resistance improved, and the resistance to water damage firstly increased and then decreased, but all of them can meet the requirements of the specification. Only when the amount of phase change material exceeded 0.3%, can it have an obvious ice snow melting effect.It can be seen that solid-solid phase change material can be added to asphalt mixture as an additive. Based on road performance, 0.3%~0.5% of phase change material is appropriate. Phase change asphalt mixture is not suitable for areas where the temperature is lower than 0 ℃ all day, and other snow and ice removal measures need to be combined to ensure road traffic capacity.

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闫卫红,王伟. 相变沥青混合料可行性及性能研究[J]. 科学技术与工程, 2023, 23(14): 6217-6222.
Yan Weihong, Wang Wei. Study on Feasibility and Performance of Phase Change Asphalt Mixture[J]. Science Technology and Engineering,2023,23(14):6217-6222.

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历史
  • 收稿日期:2022-06-17
  • 最后修改日期:2023-02-22
  • 录用日期:2022-11-18
  • 在线发布日期: 2023-06-01
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