老化作用下SDYK型温拌胶粉改性沥青高低温性能研究

Study on high and low temperature performance of SDYK modified rubber asphalt under aging effect

通过动态剪切流变试验(DSR)和低温弯曲蠕变试验(BBR),对短期老化前后不同SYDK掺量(0.4%,0.6%,0.8%)的温拌胶粉改性沥青高低温性能进行研究。DSR试验结果表明,短期老化前后,掺入SDYK温拌剂的胶粉改性沥青的复数剪切模量G~*增大、相位角δ减小、改进车辙因子G~*/sin^9δ增大,说明SDYK温拌剂的掺入改善了胶粉改性沥青的高温性能,SDYK温拌剂掺量为0.6%时胶粉改性沥青高温性能最好;BBR试验结果表明,掺入SDYK温拌剂的胶粉改性沥青劲度模量S值增大,蠕变速率m值减小,优化指标m/S值减小,说明SDYK温拌剂的掺入降低了胶粉改性沥青低温抗开裂性能。综合考虑高低温性能,质量分数为0.6%SDYK温拌剂掺量为最佳掺入量。

The high temperature and low temperature performance of rubber modified asphalts with different SDYK(0.4%, 0.6%, 0.8%) before and after aging were studied by means of dynamic shear rheological test(DSR) and bending beam rheometer test(BBR). The results of DSR indicate that the SDYK improved the high temperature performances of rubber modified asphalts, in which the complex modulus G~* and modification rutting factor G~*/sin^9δ increased and the phase angle δ decreased, and its high temperature rheological performance increased gradually with the increase of SDYK. The high temperature rheological performance of rubber modified asphalt of SDYK blending agent was 0.6%. The results of BBR indicate that SDYK reduced the low temperature performances of rubber modified asphalts, in which stiffness modulus S increased, creep speed m and the optimization decreased, and its low temperature rheological performance decreased gradually with the increase of SDYK. Comprehensively considering of the high and the low temperature performance, the mass fraction of 0.6% SDYK blending agent was the best blending amount.