微波加热-振动搅拌再生沥青混合料性能研究
首发时间:2024-04-30
摘要:为提高沥青混合料回收料(reclaimed asphalt pavement,RAP)在沥青厂拌热再生技术中的应用比例和再生沥青混合料耐久性,采用不同加热方式(电热鼓风加热、微波加热)和不同搅拌方式(振动搅拌、传统搅拌)方式制备再生沥青混合料,并与普通热拌沥青混合料进行对比,通过浸水汉堡车辙试验、半圆弯曲(semi-circular bending,SCB)试验、Overlay Test(OT)试验、动态模量试验、四点弯曲疲劳试验和CT扫描对RAP掺量为50%的再生沥青混合料进行宏微观性能测试。结果表明:微波加热和振动搅拌能够提高再生沥青混合料的低温、抗反射开裂和抗疲劳性能,但混合料的高温性能和动态模量有所降低;再生沥青混合料的性能与普通热拌沥青混合料的性能仍有一定的差距,通过改变加热方式和搅拌方式能够提高再生沥青混合料的性能,搅拌方式相较于加热方式对再生沥青混合料性能的影响更为显著;微波加热和振动搅拌均能改善再生沥青混合料内部孔隙分布状况,降低混合料内部的孔径;为提高再生沥青混合料的服役性能,可采用微波加热和振动搅拌生产再生沥青混合料。
关键词: 道路工程 再生沥青混合料 微波加热 振动搅拌 混合料性能
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Performance of recycled asphalt mixture by microwave heating & vibratory mixing
Abstract:To improve the application ratio of reclaimed asphalt pavement (RAP) blending in hot central plant recycling, this paper used different heating modes (electric blower heating, microwave heating) to heat the RAP and different mixing modes (vibration mixing and traditional mixing) to mix the recycled asphalt mixtures, and compares it\'s performance to hot mix asphalt. Hamburg wheel tracking test, Semi-circular bending test, Overlay test, dynamic modulus test, four-point bending fatigue test, and CT scan were used to evaluate the macroscopic and microscopic characteristics of recycled asphalt mixture. The results show that microwave heating and vibration mixing can improve recycled asphalt mixtures\' low-temperature performance, anti-reflective cracking performance, and anti-fatigue performance, but the high-temperature performance and dynamic modulus of the mixtures are reduced; the performance of recycled asphalt mixtures still has a certain gap with the performance of ordinary hot-mix asphalt mixtures, and the performance of recycled asphalt mixtures can be improved. The influence of heating mode on the performance of recycled asphalt mixture is more pronounced; microwave heating and vibration mixing can enhance the internal pore distribution of the mixture and lower its internal pore size. Microwave heating and vibration mixing can be utilized to manufacture recycled asphalt mixes in order to increase their service performance.
Keywords: road engineering recycled asphalt mixture microwave heating vibration mixing mixture performance
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