TOR/胶粉复合改性沥青的高温流变性能研究
Study on High-temperature Rheological Properties of TOR/Crumb Rubber Composite Modified Asphalt
以SK90#基质沥青为原料,分别掺入20%的胶粉(CR)和塑化胶粉(PCR),并添加一定的橡胶沥青连接剂(TOR),制备4种改性沥青试样,研究TOR对CR沥青与PCR沥青高温流变性能的影响。利用傅里叶变换红外光谱仪(FTIR)验证连接剂的作用机理,采用动态剪切流变仪(DSR)对改性沥青试样进行温度扫描和多重应力蠕变恢复(MSCR)试验,系统评价不同改性沥青试样的高温流变性能。结果表明:TOR与CR、沥青形成硅氧键桥接结构,提高CR与沥青的相容性。在不同改性沥青试样中,CR沥青具有更高的复数模量(G*)和车辙因子(G*/sin δ),表现出更加优异的高温性能。而CR经过塑化后,在40~90 ℃的温度下,G*的劣化率分别为15.7%、20.3%、26.4%、35.6%、42.1%和45.5%,相位角(δ)提升率分别为5%、8.7%、12.8%、13.7%、11.3%和8.9%,TOR的加入能够改善PCR沥青的高温性能。其中,4种沥青的G*/sin δ随着温度变化呈现出相同趋势。MSCR试验结果表明,在CR体系中,TOR的加入提升抗蠕变能力,在PCR体系中改善效果不显著。基于响应曲面法的分析结果表明,CR改性沥青在高温下具有更优的综合性能,因此更适用于高温服役环境。
Using SK90# base asphalt as the raw material, four modified asphalt samples were prepared by incorporating 20% crumb rubber (CR) and plasticized crumb rubber (PCR), respectively, along with a certain amount of rubber asphalt coupling agent (TOR). The effects of TOR on the high-temperature rheological properties of CR asphalt and PCR asphalt were investigated. The mechanism of the coupling agent was verified using Fourier transform infrared spectroscopy (FTIR), while temperature sweep and multiple stress creep recovery (MSCR) tests were conducted on the modified asphalt samples using a dynamic shear rheometer (DSR) to systematically evaluate their high-temperature rheological performance. The results indicated that TOR formed silicon-oxygen bond bridging structures with CR and asphalt, enhancing the compatibility between CR and asphalt. Among the different modified asphalt samples, CR asphalt exhibited higher complex modulus (G*) and rutting factor (G*/sin δ), demonstrating superior high-temperature performance. After plastication of CR, the degradation rates of G* at temperatures ranging from 40 ℃ to 90 ℃ were 15.7%, 20.3%, 26.4%, 35.6%, 42.1%, and 45.5%, respectively, while the phase angle (δ) improvement rates were 5%, 8.7%, 12.8%, 13.7%, 11.3%, and 8.9%, the addition of TOR improved the high-temperature performance of the PCR asphalt. The G*/sin δ of the four asphalts exhibited the same trend with temperature variation. MSCR test results demonstrated that in the CR system, the addition of TOR enhances creep resistance, while the improvement effect was not significant in the PCR system. Analysis based on the response surface methodology indicates that CR asphalt exhibited superior overall performance at high temperatures and was therefore more suitable for high-temperature service environments.
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青海省交控建设工程集团有限公司科研项目(JGJT-20250822-01)
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