表活型温拌SBS改性沥青试验研究及性能评价

Experimental Study and Performance Evaluation of Surface-Active Warm-Mixed SBS Modified Asphalt

摘要:

为研究表面活性型（表活型）温拌SBS改性沥青的性能特点，探究其在道路工程温拌技术中的应用潜力，采用沥青常规性能测试、动态剪切流变（DSR）、弯曲梁流变（BBR）、红外光谱分析（FTIR）、热重分析（TGA）等试验，测试其常规性能、流变特性及热稳定性。结果表明，相比SBS改性沥青，表活型温拌SBS改性沥青的高温性能变化很小，低温性能有所下降，135 ℃布氏黏度降低8.94%；加热会导致表活型温拌剂分解失重，但其失重速度与加热条件及所处环境密切相关，表活型温拌SBS改性沥青的低黏表现在受热48 h后仍得到维持。研究证实，表活型温拌SBS改性沥青具备良好应用潜力，但应控制储存条件。

Abstract:

To study the performance characteristics of surface-active warm-mixed SBS modified asphalt and explore its potential application in road engineering warm mixing technology, the conventional asphalt performance testing, dynamic shear rheometer (DSR), bending beam rheometer (BBR), Fourier transform infrared spectroscopy (FTIR), thermo gravimetric analysis (TGA) and other tests are conducted to test its general properties, rheological properties and thermal stability. The results show that compared with SBS modified asphalt, the high-temperature performance of surface-active warm-mixed SBS modified asphalt changes little, the low-temperature performance decreases slightly, and the Brinell viscosity decreases by 8.94% at 135 ℃. Heating can cause the decomposition and weight loss of surface-active warm-mixed agents, but the rate of weight loss is closely related to the heating conditions and the environment. The low viscosity performance of surface-active warm-mixed SBS modified asphalt is maintained after 48 hours of heating. Research has confirmed that the surface-active warm-mixed SBS modified asphalt has the good potential of application, but the storage conditions should be controlled.