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采用沥青与水泥的质量比为0.3的阴离子乳化沥青砂浆圆柱体试件,将其真空吸水饱和后经恒湿干燥法获得不同饱水度,再利用MTS 810疲劳试验机对基准试件和不同饱水度试件进行不同应力水平的疲劳试验,研究了水对水泥乳化沥青砂浆动态力学性能的影响。结果表明:与基准试件相比,吸水试件的极限疲劳强度显著降低,且饱水度越大,极限疲劳强度降低幅度越大;由于水泥乳化沥青砂浆中沥青相的动态黏弹性行为,使基准试件与吸水试件在不同应力水平下的应变均随着循环次数的增加而逐渐增大;基准试件的疲劳破坏形式为劈裂破坏,大多数为竖向裂缝,而在高频动荷载作用下吸水试件孔隙水形成超孔隙水压,对孔隙周围结构产生剪切作用,使其发生剪切破坏,裂缝呈倾斜状。
An asphalt emulsified asphalt mortar sample with a mass ratio of asphalt to cement of 0.3 was used to obtain different saturations after being saturated with water under vacuum by constant humidity drying method. Hydrodynamic specimens were subjected to fatigue tests at different stress levels and the effect of water on the dynamic mechanical properties of cement emulsified asphalt mortar was studied. The results show that the ultimate fatigue strength of water-absorbing specimens is significantly lower than that of the reference specimens, and the greater the saturation is, the greater the reduction of ultimate fatigue strength is. Due to the dynamic viscoelastic behavior of the asphalt phase in cement emulsified asphalt mortar The strain of the reference specimen and the water-absorbing specimen at different stress levels are gradually increased with the increase of the number of cycles. The fatigue damage of the reference specimen is splitting failure, most of which are vertical cracks. However, Under the action of load, the pore water of the water absorption specimen forms excess pore water pressure, which causes shearing action on the structure around the pore, causing shearing failure and the crack is inclined.