荷载损伤对混凝土毛细吸收作用影响

Influence of Damage Load on the Capillary Absorption of the Concrete

为研究荷载损伤及荷载作用形式对混凝土内部毛细吸收作用的影响,本文研究在0%、30%、65%、75%四种应力水平下,分别持载10min和3h,后卸载、切割,通过毛细吸收实验,测定毛细吸水量及氯离子含量分布。试验结果表明:不同荷载作用形式下,混凝土毛细吸水量随应力水平的增加先减小后增大,混凝土毛细吸收系数随应力水平的增加先减小后增大,混凝土内部各深度处的氯离子含量随应力水平的增加先减小后增加。当应力水平较低时(小于75%时),混凝土的毛细吸收表现为各向同性,当应力达到一定水平时(75%),混凝土的毛细吸收表现为各向异性。

To study the influence of different damage load on capillary absorption,the prisms were under0%,30%,65%,75% four stress levels,sustained for 10 min and 3 h respectively,unloaded and cut.The water capillary absorption and chloride ion content were measured by capillary absorption test.Results showed that under the same duration time and the same direction of capillary absorption,the concrete capillary water quantity decreased first and then increased with the increasing stress level,the capillary absorption coefficient decreased first and then increased with the increasing stress level,the chloride ion content decreased first and then increased with the increasing stress level. When the stress level is lower（ less than 75%）,the capillary absorption of concrete performed isotropic,but when the stress level increases to higher enough（ 75%）,it performed anisotropic.