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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。
The effects of three kinds of freeze-thaw media (water, 3.5wt% NaCl and aircraft deicing fluid) on the mass loss, the dynamic elastic modulus and the mechanical properties of the concrete were studied by means of rapid freeze-thaw test. The relationship between relative dynamic elastic modulus, relative residual compressive strength and relative residual flexural strength was analyzed. Based on the relative dynamic elastic modulus, the relative residual compressive strength and the relative residual flexural strength attenuation equation. The results show that the damage degree of 3.5wt% NaCl solution to concrete is far greater than that of the pure water freeze-thaw cycle, and the aircraft deicing fluid can restrain the freeze-thaw damage of concrete. The compressive strength, flexural strength and relative motion of concrete The elastic modulus decreases with the increase of the number of freeze-thaw cycles. The relationship between compressive strength and flexural strength loss rate of concrete under three kinds of freeze-thaw media is: 3.5wt% NaCl> water> aircraft deicing fluid; relative dynamic elastic modulus Relative residual compressive strength, the relative residual flexural strength of good correlation, you can measure the relative dynamic elastic modulus of concrete to assess the relative residual strength of concrete.