吸波沥青混合料的制备与性能研究

发布时间：2018-06-24 15:49

  本文选题：微波除冰雪 + 沥青混合料　； 参考：《长安大学》2014年硕士论文

【摘要】：微波除冰雪具有环保、快捷、除冰雪彻底等优点，是近些年来研究者们提出的一种新型道路除冰雪技术。但是由于普通沥青混合料对微波的吸收发热效果不好，导致微波除冰雪效率低，不能在实践中应用。本文提出将对微波具有极强吸收发热能力的磁铁矿石替代沥青混合料中石灰岩集料，以提高沥青路面的吸波发热能力，从而提高微波除冰雪效率。 通过粘附性试验，发现磁铁矿和石灰岩与沥青的粘附性等级均为5级，但是在冻融循环和延长加热时间后，磁铁矿表面的沥青剥落明显比石灰岩的严重。磁铁矿沥青混合料的水稳定性也不如石灰岩沥青混合料，通过加入一定量的消石灰能够改善磁铁矿沥青混合料的水稳定性，，消石灰掺量视磁铁矿含量而定。 通过路用性能试验，发现未加消石灰时，磁铁矿沥青混合料高温稳定性优于石灰岩沥青混合料，水稳定性明显降低，低温抗裂性有所降低；掺加消石灰后，磁铁矿沥青混合料的高温稳定性和水稳定性都明显提高，低温抗裂性无明显变化。 通过微波加热试验，发现微波加热30s后沥青温度升高0.6℃，矿粉温度升高17.1℃，石灰岩集料温度升高16.5℃，磁铁矿集料温度升高210.6℃。磁铁矿集料的发热速率是石灰岩集料的12.8倍，集料的粒径对发热速率无影响。 通过软件仿真模拟，得出：磁铁矿集料含量越高，微波除冰时间越短；环境温度越低，微波除冰时间越长，结合处温度上升速率越快；冰层厚度对微波除冰时间的影响不大，平均每增加0.01m厚的冰层，微波除冰时间延长0.3s。
[Abstract]:Microwave removal of snow and ice has the advantages of environmental protection, rapidity and thorough removal of ice and snow. It is a new way to remove ice and snow proposed by researchers in recent years. However, due to the poor absorption and heating effect of ordinary asphalt mixture to microwave, microwave can not be used in practice because of its low efficiency of ice and snow removal. In this paper, the magnetite with extremely strong heat absorption ability for microwave is put forward to replace the limestone aggregate in the asphalt mixture in order to improve the absorbing heat capacity of asphalt pavement and improve the efficiency of microwave snow and ice removal. It is found that the adhesion grade of magnetite and limestone to asphalt is 5 grade, but after freeze-thaw cycle and prolonging heating time, bitumen flaking on magnetite surface is obviously more serious than that of limestone. The water stability of magnetite asphalt mixture is also lower than that of limestone asphalt mixture. The water stability of magnetite asphalt mixture can be improved by adding a certain amount of quicklime, and the content of quicklime depends on the content of magnetite. Through road performance test, it is found that the high temperature stability of magnetite asphalt mixture is better than that of limestone asphalt mixture without adding quicklime, the water stability is obviously reduced, and the low temperature crack resistance is decreased. The high temperature stability and water stability of magnetite asphalt mixture are improved obviously, but the low temperature crack resistance is not changed obviously. Through microwave heating test, it is found that the temperature of asphalt increases 0.6 鈩

本文编号：2062046