中文摘要：

骨料-砂浆界面过渡区的力学性能对混凝土宏观受力特性有很重要的影响。在MTS试验机上对40个砂浆-花岗岩交界面试件进行了动态轴向拉伸力学性能试验研究,分析不同应变率（10-6～10-2 s-1）、不同程度预静载（30%、50%、70%静载强度）以及往复荷载（1、5 Hz）对交界面动态轴向拉伸力学性能的影响,并对其动态破坏机制进行了初探。研究结果表明：①交界面动抗拉强度随应变率增加有明显增加趋势;②较小预静载（不超过50%）不仅没有使动抗拉强度降低,反而有可能提高动抗拉强度,较大的预静载对损伤弱化效应起主导作用,从而使动抗拉强度降低;③往复荷载作用下会出现明显的低周疲劳损伤,而且残余变形随往复荷载的频率增加而减小;④不同应变率下的交界面应力-应变曲线上升段类似,约50%强度后呈现非线性变化,但非线性程度随应变率增加趋向不明显。另外,尝试性地进行了交界面试件轴向拉伸应力-应变全曲线的试验,得到了稳定断裂的全过程曲线。

英文摘要：

The mechanical behavior of mortar-aggregate interface transition zone is critical to the macro mechanical properties of concrete.A series of dynamic axial tensile tests on 40 mortar-granite interfaces specimens are carried out on MTS.Effects of different strain rates（10-6～10-2 s-1）,different initial static loads（30%、50%、70%） and the cyclic load（frequency of 1、5 Hz） on the dynamic axial tensile mechanical properties are analyzed.The fracture mechanism is explored based on the experiment results.The results indicate that： ① the dynamic tensile strength of the interface is increased obviously with the increasing of the strain rate;② the initial static load about less than 50 percent of the strength will not influence the dynamic tensile strength but maybe beneficial for it;more initial static load will be harmful to the dynamic strength because of the damage effect;③ the fatigue damage by cyclic variable amplitude load leads to the descending of strength because of the cumulative damage.Residual strain decreases with the increasing of cycle frequency;④ the ascending branch of the stress-strain curve before 50% tensile strength can be looked as straight line and then it goes into nonlinear stage which will trend toward linear with the increasing of strain rate.In addition,the complete stress-strain curve of interface is achieved on the condition of stable fracture.