国产环氧沥青结合料性能的比较研究

Comparative studies of domestic epoxy asphalt binders

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,广泛应用于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150min,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.

Due to the high strength,excellent toughness,good water-proof,heat resistance and fatigue durability,epoxy asphalts have been widely used on the pavement of long-span steel bridges.In present paper,comparative studies on the viscosity,glass transition temperature（Tg）,damping properties,mechanical properties and morphology of two kinds of high-performance epoxy asphalt binders were carried out.In addition,the impact of asphalts on the properties of epoxy resin for epoxy asphalt binders was investigated.The viscosity of warm-mix epoxy asphalt binder（WEAB）increased with the increase of temperature.On the contrary,the viscosity of hot-mix epoxy asphalt binder（HEAB）decreased with the increase of temperature.The operational time for HEAB was long to 150 min even at 180℃.Furthermore,HEAB had wider range of operational temperature.The addition of asphalt lowered the Tgof the epoxy for warm-mix epoxy asphalt binder（WEP）.However,the Tgof the epoxy for HEAB（HEP）was improved with theaddition of asphalt.The presence of asphalt improved the damping properties of epoxy for epoxy asphalt binders.HEAB exhibited more excellent damping properties than WEAB.The results of tensile tests showed that the addition of asphalt significantly improved the tensile strength of WEP,while the elongation at break of WEP was lowered.Conversely,the addition of asphalt lowered the tensile strength and improved the elongation at break of HEP.Microstructure observation indicated that phase separation existed in the epoxy asphalt binders,in which asphalt was as separation phase and epoxy was continuous phase.