基于循环荷载作用下混凝土的抗渗性衰减分析

Analysis of anti permeability attenuation performance of concrete under cyclic loading

为了研究循环荷载作用下混凝土的抗渗性,以普通混凝土和高强混凝土作对比,研究了应力水平、循环加载次数对混凝土吸水总量和氯离子浓度的影响。结果表明,随着应力水平的增大,2种混凝土的吸水总量和氯离子浓度逐渐增大,混凝土的抗渗性逐渐降低,当应力水平超过0.6时,抗渗性急剧降低;循环加载次数越多,吸水总量和氯离子浓度逐渐越大,抗渗性越低;相同条件下,高强混凝土具有更好的抗渗性;吸水总量与吸水时间呈线性规律变化,但普通混凝土的相关性更强;深度越深,氯离子浓度与应力水平的线性相关性越差。

In order to study the anti permeability of concrete under cyclic loading,this paper through the test,for the ordinary concrete and high strength concrete on contrast,studied the effects of stress level,the number of cyclic loading of concrete water absorption amount and concentration of chlorine ion.The results show that,with the increase of the stress level,the total amount of water and chloride ion concentration of two kinds of concrete increases,the anti permeability of concrete decreased gradually,when stress level is more than 0.6,anti permeability reduced sharply;the more times of cyclic loading,the total amount of water and chloride ion concentration increased,the anti permeability is lower;under the same condition,high strength concrete has better anti permeability;changed linearly between total water absorption and water absorption time,but the stronger correlation of ordinary concrete;the greater the depth,the linear correlation between the concentration of chloride ion and the stress level should be worse.