南京大学学报(自然科学版) ›› 2016, Vol. 52 ›› Issue (2): 213.
• • 下一篇
孙一帆,张育歌,许 可,谢鸿峰*,王治流,程镕时
Sun Yifan, Zhang Yuge, Xu Ke, Xie Hongfeng*, Wang Zhiliu, Cheng Rongshi
摘要: 环氧沥青具有强度高、韧性好、耐水性好、耐温性能优异、耐疲劳性能好等特点,广泛应用大跨径钢桥面的铺装。对两种国产高性能环氧沥青结合料的粘度、玻璃化转变温度(Tg)、阻尼行为、力学性能和微观形貌的影响进行了比较研究。此外,还研究了沥青对两种环氧沥青结合料所用环氧树脂性能的影响。研究表明,温拌型环氧沥青结合料(WEAB)的粘度随着温度的增加而快速增加,而热拌型环氧沥青结合料(HEAB)的粘度则随温度的增加而逐渐减小。180 ℃时HEAB的可施工时间长达150 min,并且可施工温度更加宽泛。沥青的加入使得温拌型环氧沥青结合料所用环氧树脂(WEP)的玻璃化转变温度(Tg)降低,但使热拌型环氧沥青结合料所用环氧树脂(HEP)的Tg升高。沥青的加入提高了环氧树脂的阻尼性能,热拌型环氧沥青结合料具有更加优异的阻尼性能。力学性能研究表明,沥青的加入显著提高了WEP的拉伸强度,但断裂伸长率却随之降低。相反,HEP的拉伸强度却因沥青的加入而降低,断裂伸长率明显增大。微观形貌研究表明,环氧沥青结合料以相分离结构存在,其中沥青为分散相,环氧树脂为连续相。
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