不同冻融介质作用下混凝土力学性能衰减模型

发布时间：2018-03-22 09:33

本文选题：衰减方程　切入点：抗折强度　出处：《复合材料学报》2017年02期 　论文类型：期刊论文

【摘要】：通过快速冻融试验,研究了三种不同冻融介质(水、3.5wt%NaCl、飞机除冰液)对混凝土质量损失、动弹模量以及力学性能的影响,比较了三种冻融介质对混凝土损伤程度的大小,分析了混凝土相对动弹性模量与相对剩余抗压强度和相对剩余抗折强度之间的关系,基于相对动弹性模量建立了相对剩余抗压强度和相对剩余抗折强度衰减方程。结果表明:3.5wt%NaCl溶液对混凝土的损伤度要远大于单纯水冻融循环对混凝土的损伤度,飞机除冰液对混凝土冻融损伤具有抑制作用;混凝土抗压、抗折强度以及相对动弹性模量随着冻融循环次数的增加而降低;三种冻融介质下混凝土抗压、抗折强度损失率大小关系为:3.5wt%NaCl水飞机除冰液;相对动弹性模量与相对剩余抗压强度、相对剩余抗折强度相关性好,可以通过测定混凝土相对动弹性模量来评估混凝土相对剩余强度。
[Abstract]:Through rapid freeze-thaw test, the effects of three different freezing and thawing media (water 3.5 wtNaCl, aircraft deicing fluid) on the mass loss, dynamic modulus of elasticity and mechanical properties of concrete were studied, and the damage degree of the three freeze-thaw media to concrete was compared. The relationship between the relative dynamic modulus of elasticity and the relative residual compressive strength and the relative residual flexural strength of concrete is analyzed. Based on the relative dynamic modulus of elasticity, the attenuation equations of relative residual compressive strength and relative residual flexural strength are established. The results show that the damage degree of concrete caused by 3.5 wt NaCl solution is much greater than that of pure water freeze-thaw cycle. Aircraft deicing fluid can inhibit the damage of concrete freezing and thawing; the compressive strength, flexural strength and relative dynamic elastic modulus of concrete decrease with the increase of freeze-thaw cycles; The relationship between the loss rate of the flexural strength and the relative residual compressive strength, the relative dynamic modulus of elasticity and the relative residual compressive strength are good. The relative residual strength of concrete can be evaluated by measuring the relative dynamic elastic modulus of concrete.
【作者单位】：内蒙古工业大学土木工程学院;
【基金】：国家自然科学基金(11362013)
【分类号】：TU528

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