True-Triaxial-Teststand

真三轴试验台(TTT)的大型设备申请是与批准的SFB/TRR“数字双子路”一起提交的。利用该试验台，可以在所有主应力方向(拉压膨胀和交变荷载)上实现不同尺寸的试件的循环加载，以表征粘结道路建筑材料(沥青、混凝土)在与路面相关的荷载变量和频率、交通和温度下的行为。液压缸用于在-20°C到+70°C之间的温度下对立方体形状的试件(15*15*15厘米)施加高达63.5kN的负载，负载频率高达10赫兹，作为正弦拉伸-膨胀、压缩-膨胀和拉伸-压缩-交变负载。各种负载方向的负载最大值的产生要有时间延迟。应该能够以1微米的精度在所有方向上同步测量响应于载荷而发生的弹性和塑性变形。试验结果将被用来模拟路面的材料行为，作为与SFB/TRR的各个子项目(TP)合作的路面结构建模的基础，目的是预测路面的使用寿命，并根据可持续性标准优化路面的材料和结构。

The large-scale equipment application for the True Triaxial Test Stand (TTT) is submitted in connection with the approved SFB/TRR "Digital Twin Road". With this test rig, cyclic loading of specimens of different sizes in all main stress directions (tension-compressionswell and alternating loads) is to be realized to characterize the behavior of bonded road construction materials (asphalt, concrete) under load variables and frequencies from traffic and temperature that are relevant for road pavements. Hydraulic cylinders are to be used to apply loads of up to 63.5 kN with load frequencies of up to 10 Hz to cube-shaped test specimens (15*15*15 cm) as sinusoidal tension-swell, compression-swell and tension-compression-alternating loads at temperatures between - 20 and + 70 °C. The load maxima in the various load directions are to be generated with a time delay. It should be possible to measure the elastic and plastic deformations that occur in response to the loads synchronously in all directions with an accuracy of 1 micro meter. The results of the tests will be used to model the material behavior of pavements as a basis for the structural modeling of pavements in cooperation with various subprojects (TP) of the SFB/TRR with the objective of predicting the service life of pavements and optimizing the materials and the structure of pavements according to sustainability criteria.