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基于混凝土盐冻损伤本构模型,对质量分数为3%氯化钠和5%硫酸钠混合溶液侵蚀下,经历不同冻融循环次数、不同水灰比的混凝土试验数据进行力学性能和材料损伤情况定量分析,分析结果与试验数据吻合较好;并将上述混合复合作用混凝土与单纯冻融作用混凝土的试验结果进行对比和损伤发展分析,得到以下结论:冻融次数相同时盐冻混凝土的抗压强度大于纯冻融混凝土,冻融循环次数N等于100是盐冻混凝土和纯冻融混凝土力学和损伤性能的界限点。N小于100时,盐冻混凝土的初始损伤值、相对变形和应力峰值对应的相对损伤均小于纯冻融混凝土的相应值;而在N等于150和200时,结果则相反。
Based on the constitutive model of concrete salt frost injury, the mechanical properties and material damage of concrete subjected to freeze-thaw cycles and different water-cement ratios under the erosion of 3% sodium chloride and 5% sodium sulfate mixed solution The results of the analysis and analysis are in good agreement with the experimental data. Comparing the experimental results of the composite concrete with those of pure concrete with freeze-thaw action, we can draw the following conclusions: The compressive strength of the frozen concrete with the same number of freeze-thaw cycles Strength greater than pure freeze-thaw concrete, the number of freeze-thaw cycles N is equal to 100 is the limit point of mechanical and damage properties of salt-frozen concrete and pure-freeze-thaw concrete. When N is less than 100, the relative damage corresponding to the initial damage value, relative deformation and stress peak value of salt-frozen concrete are less than those of pure-freeze-thaw concrete. When N is equal to 150 and 200, the result is the opposite.