岩沥青-胶粉复合改性沥青混合料黏弹特性研究
首发时间:2024-04-30
摘要:为研究岩沥青-胶粉复合改性沥青混合料的黏弹特性,采用沥青混合料性能试验机(AMPT)对不同岩沥青用量的复合改性沥青混合料在不同试验条件下的单轴动态压缩模量和相位角进行了测试,构建了动态模量主曲线,建立了动态模量预测模型。结果表明:当试验温度的增大或加载频率的降低时,岩沥青-胶粉复合改性沥青混合料的动态模量逐渐降低;随着岩沥青掺量的增加,AC-20复合改性沥青混合料抗车辙性能提高,疲劳性能降低;复合改性沥青混合料测定的20 ℃动态模量接近于14 000 MPa,符合高模量沥青混合料的技术要求;经测试,所构建的动态模量预测模型的预测精度可达83%。
关键词: 道路工程 复合改性沥青混合料 胶粉改性沥青 岩沥青 黏弹特性
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Viscoelastic properties of rock asphalt-rubber composite modified asphalt mixture山东省重点研发计划项目(2020CXGC011405)
Abstract:The purpose of this study was to examine the viscoelastic properties of rock asphalt-rubber composite modified asphalt mixture, the asphalt mixture performance testing machine (AMPT) was used to measure the phase angle and uniaxial dynamic compression modulus of the composite modified asphalt mixture\'s various material compositions under various test conditions. The dynamic predictive modulus and primary dynamic modulus curve of the rock asphalt-rubber composite-modified asphalt mixture were established using the time-temperature equivalency approach. The results indicated that, the dynamic modulus of the rock asphalt-rubber powder composite modified asphalt mixture gradually decreased as the test temperature or loading frequency increased; the rutting resistance of the AC-20 composite modified asphalt mixture improved as the rock asphalt doping level increased, but the fatigue performance decreased; the dynamic modulus of the rock asphalt-rubber composite modified asphalt mixture is determined to be close to 14 000 MPa at 20 C. The study\'s created dynamic modulus prediction model can reach 83% prediction accuracy, and the findings fulfill the high modulus technical criteria for asphalt mixtures.
Keywords: road engineering composite modified asphalt mixture rubber modified asphalt rock asphalt viscoelastic properties
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