冻融条件下相变沥青混合料的低温抗裂及调温性能
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内蒙古工业大学土木工程学院

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U414

基金项目:

内蒙古自然科学基金(2019MS05060);内蒙古自治区高等学校科学研究项目(NJZZ20064);


Low temperature anti-cracking performance and temperature regulating properties of phase change asphalt mixture under freezing-thawing conditions
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School of Civil Engineering, Inner Mongolia University of Technology

Fund Project:

Inner Mongolia Natural Science Foundation of China, No.2019MS05060; Inner Mongolia Higher Education Science Research Project, No.NJZZ20064;

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    摘要:

    为研究DTC相变材料对温拌沥青混合料的低温抗裂性影响规律及其低温调温性能,进行了低温劈裂试验、约束试件温度应力试验、核磁共振技术、差示扫描量热法,并实测了试验路段面层温度。结果表明:DTC相变材料在升降温过程中均能很好地实现吸热放热,通过焓值对比发现其在降温过程中的调温效果更加明显;根据试验路段现场测温可知,相变沥青路面比普通沥青路面高6℃左右,降温开始时间延迟了60min左右。而随着DTC掺量的增大,相变沥青混合料的劈裂强度降低,冻断温度和转折点温度升高,孔隙率增大,这都降低了沥青混合料的低温抗裂性。相关性分析表明,孔隙度与低温劈裂强度、冻断温度和转折点温度的相关系数都在0.97以上,各指标紧密关联。可见,将DTC相变材料掺入沥青混合料能够有效提升沥青路面内部的温度,但会对沥青路面的抗裂性能造成一定的负面影响。同时,采用冻断温度和转折点温度的Logistic曲线拟合,在DTC掺量为3‰时得到拐点。因此,当DTC掺量为3‰时,沥青混合料的强度既能保证规范要求,又能表现出稳定的调温性能。

    Abstract:

    In order to study the influence of DTC phase change material on low-temperature crack resistance and temperature regulation performance of warm mix asphalt mixtures, low-temperature splitting test, temperature stress tests of constrained specimen, nuclear magnetic resonance technology, differential scanning calorimetry were carried out, and the surface temperature of asphalt pavement layers on the test section was measured. The results show that DTC phase change material can achieve heat absorption and release well in the process of rising and cooling. What’s more, it is found that its temperature regulation effect in the cooling process is more obvious by comparing enthalpy values. According to the field temperature measurement, the phase change asphalt pavement is about 6°C higher than that of the ordinary asphalt pavement, and the cooling start time is delayed about 60minutes. However, with the increase of DTC’s dosage, the splitting strength of phase change material asphalt mixture decreases, freeze-off temperature and turning point temperature rise, and the porosity increases, which reduce the low temperature crack resistance of asphalt mixture. The correlation analysis shows that the correlation coefficient of porosity with low temperature splitting strength, freezing break temperature and turning point temperature is above 0.97, and all indexes are closely correlated. Therefore, adding DTC phase change material into asphalt mixture can effectively improve the temperature of asphalt pavement, but it will have a certain negative impact on the anti-crack performance of asphalt pavement. At the same time, Logistic curve fitting of freezing break temperature and turning point temperature was used to obtain the inflection point when DTC dosage was 3‰. Thus, when the DTC dosage is 3‰, the strength of phase change asphalt mixture can not only ensure the specification requirements, only meet the requirements of medium traffic load, but also show stable temperature regulation performance.

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宋云连,孙瑜. 冻融条件下相变沥青混合料的低温抗裂及调温性能[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-11-19
  • 最后修改日期:2022-03-27
  • 录用日期:2022-04-30
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