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特立尼达湖沥青(Trinidad Lake Asphalt,简称TLA)作为天然沥青中的一种,其性能稳定,应用广泛,但对TLA改性沥青的评价体系尚不完善,首先,考察不同的基质沥青、不同掺量的TLA改性沥青进行了TLA改性沥青的针入度、延度、软化点等常规指标试验,然后,考察粉胶比对常规指标的影响以及掺量对粘度的影响,最后,通过DSR及BBR试验了解TLA掺量对改性沥青性能的影响,以此探索TLA改性沥青的评价指标,研究结果表明:沥青的常规三大指标和粘度指标已不适用于TLA改性沥青的评价,车辙因子呈现逐渐上升的趋势,随TLA湖沥青掺量的增加,沥青的低温性能整体上逐渐减小,PG分级指标能够较好地评价TLA改性沥青性能。
Trinidad Lake Asphalt (Trinidad Lake Asphalt, referred to as TLA) as a natural asphalt, its performance is stable, widely used, but the TLA modified asphalt evaluation system is not perfect, first of all, to examine different matrix asphalt, TLA modified asphalt with different dosages of TLA modified asphalt penetration, ductility, softening point and other conventional indicators of test, and then to investigate the effect of powder to rubber ratio on conventional indicators and the impact of dosage on viscosity, and finally, Through the DSR and BBR tests to understand the impact of TLA content on the performance of modified asphalt to explore TLA modified asphalt evaluation index, the results show that: the conventional asphalt three indexes and viscosity indicators are not suitable for TLA modified asphalt Evaluation and rutting factor showed a gradual upward trend. With the increase of asphalt content in TLA, the overall low temperature performance of asphalt gradually decreased, and the PG classification index could better evaluate the performance of TLA modified asphalt.