氧化石墨烯及多聚磷酸复合改性剂对沥青自愈合性能的影响
首发时间:2024-03-28
DOI:10.61951/SciencepaperOnline.202403.0391
摘要:为了研究氧化石墨烯(graphite oxide,GO)和多聚磷酸(polyphosphoric acid,PPA)复合改性剂对沥青自愈合性能的影响效果,利用Materials Studio软件构建基质沥青和GO/PPA复合改性沥青的分子模型,通过密度、溶解度和玻璃化转变温度对建立的沥青模型进行合理性验证;在2组沥青之间插入1 nm的真空层以表示疲劳损伤后产生的微裂缝,研究基质沥青和GO/PPA复合改性沥青在不同温度下的自愈合过程,并以均方位移、扩散系数和活化能、指前因子为指标对两者的自愈合能力进行了评价,最后通过动态剪切流变试验验证模拟结果的准确性。结果表明:随着温度的升高,基质沥青和GO/PPA复合改性沥青中的微裂缝可以更快速修复;与基质沥青相比,GO/PPA复合改性沥青的扩散系数更大,因此具有更高的自愈合效率。研究成果有助于加深对GO/PPA复合改性剂自愈合效果的理解,为后续类似研究提供理论依据。
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Effect of graphene oxide and polyphosphoric acid composite modifier on self-healing performance of asphalt
Abstract:In order to study the effect of graphite oxide (GO) and polyphosphoric acid (PPA) composite modifier on the self-healing performance of asphalt, the molecular models of matrix asphalt and modified asphalt were established by Materials Studio software. The asphalt model was verified by density, solubility and glass transition temperature, and a vacuum layer of 1 nm was inserted between the two groups of asphalt to represent the micro-cracks after fatigue damage. The self-healing process of matrix asphalt and GO/PPA modified asphalt at different temperatures was studied, and the self-healing ability of both asphalt and GO/PPA modified asphalt was evaluated by the mean square displacement, diffusion coefficient, activation energy and pre-exponential factor. Finally, the accuracy of the simulation results was verified by rheological test. The results show that micro-cracks in matrix asphalt and GO/PPA modified asphalt can be repaired more quickly with the increase of temperature, and the diffusion coefficient of GO/PPA modified asphalt is higher than that of matrix asphalt, indicating a higher self-healing efficiency. The research results are helpful to deepen the understanding of the self-healing effect of GO/PPA composite modifier, and provide a theoretical basis for the follow-up similar research.
Keywords: graphene oxide polyphosphoric acid Molecular dynamics self-healing
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