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首页> 外文期刊>Russian Journal of Nondestructive Testing >Investigation of the Relationship between the Parameters of Electric Response to Impact Excitation of Porous Heterogeneous Materials and Variations in Their Strength under the Conditions of Cyclic Freezing-Defreezing
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Investigation of the Relationship between the Parameters of Electric Response to Impact Excitation of Porous Heterogeneous Materials and Variations in Their Strength under the Conditions of Cyclic Freezing-Defreezing

机译:循环冻结-解冻条件下多孔非均质材料冲击激发电响应参数与强度变化之间关系的研究

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摘要

A decrease in the strength of cement—sand specimens due to cyclic alternating-sign tem-perature excitation is shown to yield a shift of the principal maximum and the entire spectrum of the electric response to an impact excitation towards lower frequencies, spectrum broadening, and dete-rioration of the spectral maxima quality factor. Structures made of composite construction materials such as concrete and reinforced concrete are often subject to considerable seasonal temperature variations. Long-term operation under such condi-tions yields a decrease in the strength of structural units. A decrease in the concrete strength during its freezing is attributed to the wedging action of water during its freezing in pores and microcracks that leads to the appearance of local stress centers and an increasing number of microdamages in the material struc-ture. Multiple freezing and defreezing yield residual deformations, it being one of the key factors respon-sible for the fracture of water-containing porous materials under cyclic alternating-sign actions of the environment [1,2].
机译:结果表明,由于周期性交替符号温度激励,水泥砂样品的强度降低,导致冲击响应的主最大值和整个频谱向较低的频率,频谱展宽和频谱最大品质因数的降低。由复合建筑材料(例如混凝土和钢筋混凝土)制成的结构通常会经受相当大的季节性温度变化。在这种条件下长期运行会降低结构单元的强度。混凝土在冻结过程中强度的下降归因于水在孔隙和微裂纹中冻结时的楔入作用,这导致局部应力中心的出现和材料结构中微损伤的增加。多次冷冻和解冻会产生残余变形,这是在环境的循环交替作用下,水性多孔材料破裂的关键因素之一[1,2]。

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