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Dynamic compressive strength of concrete damaged by fatigue loading and freeze-thaw cycling

机译：疲劳载荷和冻融循环破坏混凝土的动态抗压强度

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Uniaxial dynamic compression tests were carried out on 180 concrete prism specimens exposed to freeze-thaw cycles combined with fatigue compression loading. The effects of four categories of damage modes, such as fatigue compression loading (Mode F), freeze-thaw cycling (Mode FT), fatigue compression loading followed by freeze-thaw cycling (Mode F-FT), and freeze-thaw cycling followed by fatigue compression loading (Mode FT-F), on the dynamic compressive strength of concrete were investigated systematically. The variable ICS was introduced to characterize the combined effect of fatigue loads and freeze-thaw damage, and the influence of single factor of fatigue load or freeze -thaw cycles as well as the double factors with different sequence on the dynamic damage characteristics of concrete were discussed. The results showed that, when the number of fatigue cycles and the number of freeze-thaw cycles remained constant, just with different sequence, the values of Kc under damage Mode F-FT were obviously higher than that under damage Mode FT-F at the same strain rate. The trends in damaging effects on compressive strength of concrete were justified based on microscopic observation of the trends in micro crack growth under such damaging effects. In addition, concrete has apparent strain rate effect after exposed to freeze-thaw cycles combined with fatigue compression loading. The dynamic compressive strength of damaged concrete increases as the strain rate is increased. (C) 2017 Published by Elsevier Ltd.
机译：对经受冻融循环和疲劳压缩载荷的180个混凝土棱镜样品进行了单轴动态压缩试验。四种损坏模式的影响，例如疲劳压缩载荷（F模式），冻融循环（Mode FT），疲劳压缩载荷随后是冻融循环（Mode F-FT）和紧随其后的冻融循环通过疲劳压缩载荷（模式FT-F），对混凝土的动态抗压强度进行了系统的研究。引入变量ICS来表征疲劳载荷和冻融损伤的综合作用，并分别研究了疲劳载荷或冻融循环的单因素以及顺序不同的双重因素对混凝土动态损伤特性的影响。讨论过。结果表明，当疲劳循环次数和冻融循环次数保持恒定时，只是顺序不同，损伤模式F-FT下的Kc值明显高于损伤模式FT-F下的Kc。相同的应变率。基于在这种破坏作用下微观裂纹扩展趋势的微观观察，证明了对混凝土抗压强度的破坏作用趋势是合理的。此外，混凝土在经受冻融循环和疲劳压缩载荷后具有明显的应变率效应。随着应变率的增加，受损混凝土的动态抗压强度也随之增加。 （C）2017由Elsevier Ltd.发布

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