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High-dynamic compressive and tensile strength of specimens made of cementitious materials

机译：水泥材料制成的标本高动态抗压强度

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摘要

The strength of specimens made of cementitious materials increases with increasing loading rate. Herein, the model of Fischer et al. (CCR 58, 2014, 186-200) is revisited in the context of high-dynamic compression and extended to high-dynamic tension. The model is based on the assumptions (i) that cracking will start if the quasi-static material strength is reached, and (ii) that the high-dynamic strength gain refers to the increase of the stress during the failure process of the tested specimen. The model explains the behavior of cylindrical specimens made of dry cement paste, mortar, and concrete, subjected to high-dynamic compression. It also elucidates the performance of cylindrical specimens made of dry mortar and concrete, subjected to high-dynamic tension. It is concluded that the high-dynamic strength gain is a structural effect and that structures will be damaged if the dynamic stress exceeds the quasi-static strength, no matter how fast the stress is increased and how short the stress pulse lasts.
机译：采用水泥材料制成的标本强度随着负载率的增加而增加。在此，Fischer等人的模型。 （CCR 58,2014,186-200）在高动态压缩的背景下重新审视，并扩展到高动态张力。该模型基于假设（i）如果达到准静态材料强度，并且（ii）高动态强度增益是指经测试样本的故障过程中应力的增加。该模型解释了由干水泥浆料，砂浆和混凝土制成的圆柱标本的行为，经受高动态压缩。它还阐明了干砂浆和混凝土制成的圆柱形样品的性能，经受高动态张力。得出结论是，高动态强度增益是一种结构效果，如果动态应力超过准静态强度，结构会损坏，无论压力如何增加，应力脉冲有多短。

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