基于 DSR 和 BBR 试验的 TLA 改性沥青胶浆高低温性能研究

摘要

以 DM－70和 SK －90两种基质沥青分别制备不同 TLA 掺量（5％，10％，15％，20％）和不同粉胶比（0.6，0.8，1.0，1.2）的 TLA 改性沥青胶浆。利用 DSR 和 BBR 试验，分别测试沥青胶浆的 G*／sinδ、S 以及 m －值等参数，以评价 TLA 改性沥青胶浆的高低温性能。试验结果表明：随着 TLA 掺量和粉胶比的增大，沥青胶浆的G*／sinδ和 S 呈指数增长，m －值总体在下降，但规律性不明显，说明增大 TLA 掺量和提高粉胶比，能够改善沥青胶浆的高温性能，但对其低温性能有所损伤。平衡沥青胶浆的高低温性能，推荐 TLA 掺量和粉胶比分别取10％和1.0。%The base asphalts are DM-70 and SK -90.The TLA modified asphalt mortar with dif-ferent filler-asphalt ratio(0.6,0.8,1.0,1.2)and TLA content,which are 5%,10%,15% and 20% by mass of base asphalt,are prepared.The G* /sinδ,S and m-value of TLA modified asphalt mortar are test-ed using DSR and BBR and the high-and-low-temperature properties of TLA modified asphalt mortar are analyzed.With the TLA content and filler-asphalt ratio increase,the G* /sinδand S increases exponen-tially and m-value decreases,while changes in m-value is not obvious.With the TLA content and the fill-er-asphalt ratio increases,the high-temperature property of asphalt mortar improves,and the low-tempera-ture property of asphalt mortar decline.It suggested that the high-and-low-temperature properties of TLA modified asphalt mortar are best when TLA content is 10% and the filler-asphalt ratio is 1.0.