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青藏高原寒冷地区年平均气温低,温差大,冻融循环频繁,并且日照时间过长导致紫外线辐射老化严重,故沥青性能要求不同于一般地区。基于SHRP中BBR试验,开发一套相对简单的沥青小梁弯曲蠕变试验设备,通过低温弯曲蠕变试验、老化后低温弯曲蠕变试验,分析6种西藏地区常用改性沥青在不同温度下老化前后的蠕变劲度模量与蠕变应变速率,表征各改性沥青在低温区间的温度敏感性以及其抗老化性能。结果表明:SBS(I-B)改性沥青低温温度敏感性最佳,可显著提高沥青路面低温性能;SBS(I-A)抗老化性能最好,可减少由于日照时间长,紫外线辐射严重,沥青老化,粘结力下降所引起的各种病害。
The average annual temperature in the cold region of the Qinghai-Tibet Plateau is low, the temperature difference is large, the freeze-thaw cycle is frequent, and the long sunshine duration leads to the serious ultraviolet radiation aging. Therefore, the asphalt performance requirements are different from those in the general area. Based on the BBR test in SHRP, a relatively simple bending creep testing equipment for asphalt trabecula was developed. Through the low temperature creep creep test and the low temperature creep creep test after aging, six kinds of commonly used modified asphalt in Tibet were aged at different temperatures Before and after the creep stiffness modulus and creep strain rate, characterized by the modified asphalt in the low temperature range of temperature sensitivity and anti-aging properties. The results show that SBS (IB) modified asphalt has the best temperature sensitivity at low temperature, which can significantly improve the low temperature performance of asphalt pavement. SBS (IA) has the best anti-aging performance, which can reduce the long-term sunshine duration, ultraviolet radiation, All kinds of diseases caused by the drop of knot strength.