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Basic Examination on Assessing Mechanical Properties of Concrete That Has Suffered Combined Deterioration from Fatigue and Frost Damage

机译:评估疲劳和霜冻破坏共同恶化的混凝土力学性能的基本检验

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摘要

An examination including an evaluation of mechanical properties of concrete that had suffered combined deterioration from fatigue and frost damage was done using cylindrical specimens. The order of deterioration and degree of deterioration of the specimens were used as variables. The examination clarified that certain mechanical properties of concrete that had undergone combined deterioration were able to be evaluated by measuring the propagation speed of ultrasonic waves. The decrease in the elastic modulus and the ultrasonic velocity that accompanies the increase in the number of freeze–thaw cycles was smaller in the specimens that experienced fatigue first and then frost damage than in the specimens that experienced frost damage only. The values for mechanical properties (e.g., compressive strength, elastic modulus, and shrinkage strain) of the specimen that experienced frost damage first and then fatigue had already greatly decreased after the application of freeze–thaw cycles. Therefore, the decrease in the mechanical properties was small even with increases in the number of loading cycles. The decrease in the fatigue life of the specimen in the fatigue test was proportional to the deterioration from the preceding frost damage.
机译:使用圆柱形试样对包括因疲劳和霜冻损害而综合恶化的混凝土的机械性能进行了评估。将样品的劣化顺序和劣化程度用作变量。该检查表明,通过测量超声波的传播速度,可以评估已发生复合劣化的混凝土的某些机械性能。冻融循环次数增加时,弹性模量和超声速度的降低要比仅经历霜冻破坏的样品首先小,然后经历霜冻破坏。经过冻融循环后,首先遭受霜冻破坏然后疲劳的试样的机械性能(例如,抗压强度,弹性模量和收缩应变)值已经大大降低。因此,即使加载循环次数增加,机械性能的降低也很小。在疲劳试验中,样品疲劳寿命的减少与先前的霜冻损坏导致的劣化成正比。

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