TLA改性沥青及其混合料的低温性能研究

Study on the Low Temperature Performance of TLA Modified Asphalt and Mixture

TLA是一种产自特立尼达岛沥青湖中的天然沥青,它对沥青胶结料高温稳定性、耐久性的改善效果显著,因此业内主要围绕TLA改性沥青的高温性能进行研究。然而沥青的黏弹特性使其在高、低温环境中呈现完全不同的形态,难以使其同时具备优良的高、低温性能。为了提高TLA改性沥青及其混合料性能研究的完整度,对TLA改性沥青及其混合料的低温性能进行了研究。研究结果表明:TLA改性沥青及其混合料低温性能的衰减与TLA掺量的增加有关。当TLA掺量从10%增大到20%时,TLA改性沥青及其混合料的低温性能较原样材料衰减最快。若工程项目主要考虑沥青混合料的低温性能,应控制TLA掺量不大于10%。

Being a natural asphalt from the asphalt lake in Trinidad,TLA improves greatly the high temperature stability and durability of asphalt binders and the high-temperature performance of TLA modified asphalt is mainly focused in the industry.In order to improve the performance study integrity,the low temperature performance of TLA modified asphalt and mixture were studied.The results show that the low-temperature performance decay of TLA modified asphalt and its mixture are related to the increase of TLA dosing.When the TLA dose increasing from 10%to 20%,low-temperature performance of TLA modified asphalt and mixture decay fastest than the original sample material.If the low-temperature performance of asphalt mixture is key considered,TLA dose should be controlled not more than 10%.